Commit ed914f69 authored by Dave Airlie's avatar Dave Airlie

Merge tag 'of_videomode_helper' of git://git.pengutronix.de/git/str/linux into drm-next

videomode helpers for of + devicetree stuff, required for new kms drivers

(not the fbdev maintainer).

* tag 'of_videomode_helper' of git://git.pengutronix.de/git/str/linux:
  drm_modes: add of_videomode helpers
  drm_modes: add videomode helpers
  fbmon: add of_videomode helpers
  fbmon: add videomode helpers
  video: add of helper for display timings/videomode
  video: add display_timing and videomode
  viafb: rename display_timing to via_display_timing
parents bb0f78dd edb37a95
display-timing bindings
=======================
display-timings node
--------------------
required properties:
- none
optional properties:
- native-mode: The native mode for the display, in case multiple modes are
provided. When omitted, assume the first node is the native.
timing subnode
--------------
required properties:
- hactive, vactive: display resolution
- hfront-porch, hback-porch, hsync-len: horizontal display timing parameters
in pixels
vfront-porch, vback-porch, vsync-len: vertical display timing parameters in
lines
- clock-frequency: display clock in Hz
optional properties:
- hsync-active: hsync pulse is active low/high/ignored
- vsync-active: vsync pulse is active low/high/ignored
- de-active: data-enable pulse is active low/high/ignored
- pixelclk-active: with
- active high = drive pixel data on rising edge/
sample data on falling edge
- active low = drive pixel data on falling edge/
sample data on rising edge
- ignored = ignored
- interlaced (bool): boolean to enable interlaced mode
- doublescan (bool): boolean to enable doublescan mode
All the optional properties that are not bool follow the following logic:
<1>: high active
<0>: low active
omitted: not used on hardware
There are different ways of describing the capabilities of a display. The
devicetree representation corresponds to the one commonly found in datasheets
for displays. If a display supports multiple signal timings, the native-mode
can be specified.
The parameters are defined as:
+----------+-------------------------------------+----------+-------+
| | ↑ | | |
| | |vback_porch | | |
| | ↓ | | |
+----------#######################################----------+-------+
| # ↑ # | |
| # | # | |
| hback # | # hfront | hsync |
| porch # | hactive # porch | len |
|<-------->#<-------+--------------------------->#<-------->|<----->|
| # | # | |
| # |vactive # | |
| # | # | |
| # ↓ # | |
+----------#######################################----------+-------+
| | ↑ | | |
| | |vfront_porch | | |
| | ↓ | | |
+----------+-------------------------------------+----------+-------+
| | ↑ | | |
| | |vsync_len | | |
| | ↓ | | |
+----------+-------------------------------------+----------+-------+
Example:
display-timings {
native-mode = <&timing0>;
timing0: 1080p24 {
/* 1920x1080p24 */
clock-frequency = <52000000>;
hactive = <1920>;
vactive = <1080>;
hfront-porch = <25>;
hback-porch = <25>;
hsync-len = <25>;
vback-porch = <2>;
vfront-porch = <2>;
vsync-len = <2>;
hsync-active = <1>;
};
};
Every required property also supports the use of ranges, so the commonly used
datasheet description with minimum, typical and maximum values can be used.
Example:
timing1: timing {
/* 1920x1080p24 */
clock-frequency = <148500000>;
hactive = <1920>;
vactive = <1080>;
hsync-len = <0 44 60>;
hfront-porch = <80 88 95>;
hback-porch = <100 148 160>;
vfront-porch = <0 4 6>;
vback-porch = <0 36 50>;
vsync-len = <0 5 6>;
};
......@@ -35,6 +35,8 @@
#include <linux/export.h>
#include <drm/drmP.h>
#include <drm/drm_crtc.h>
#include <video/of_videomode.h>
#include <video/videomode.h>
/**
* drm_mode_debug_printmodeline - debug print a mode
......@@ -504,6 +506,74 @@ drm_gtf_mode(struct drm_device *dev, int hdisplay, int vdisplay, int vrefresh,
}
EXPORT_SYMBOL(drm_gtf_mode);
#if IS_ENABLED(CONFIG_VIDEOMODE)
int drm_display_mode_from_videomode(const struct videomode *vm,
struct drm_display_mode *dmode)
{
dmode->hdisplay = vm->hactive;
dmode->hsync_start = dmode->hdisplay + vm->hfront_porch;
dmode->hsync_end = dmode->hsync_start + vm->hsync_len;
dmode->htotal = dmode->hsync_end + vm->hback_porch;
dmode->vdisplay = vm->vactive;
dmode->vsync_start = dmode->vdisplay + vm->vfront_porch;
dmode->vsync_end = dmode->vsync_start + vm->vsync_len;
dmode->vtotal = dmode->vsync_end + vm->vback_porch;
dmode->clock = vm->pixelclock / 1000;
dmode->flags = 0;
if (vm->dmt_flags & VESA_DMT_HSYNC_HIGH)
dmode->flags |= DRM_MODE_FLAG_PHSYNC;
else if (vm->dmt_flags & VESA_DMT_HSYNC_LOW)
dmode->flags |= DRM_MODE_FLAG_NHSYNC;
if (vm->dmt_flags & VESA_DMT_VSYNC_HIGH)
dmode->flags |= DRM_MODE_FLAG_PVSYNC;
else if (vm->dmt_flags & VESA_DMT_VSYNC_LOW)
dmode->flags |= DRM_MODE_FLAG_NVSYNC;
if (vm->data_flags & DISPLAY_FLAGS_INTERLACED)
dmode->flags |= DRM_MODE_FLAG_INTERLACE;
if (vm->data_flags & DISPLAY_FLAGS_DOUBLESCAN)
dmode->flags |= DRM_MODE_FLAG_DBLSCAN;
drm_mode_set_name(dmode);
return 0;
}
EXPORT_SYMBOL_GPL(drm_display_mode_from_videomode);
#endif
#if IS_ENABLED(CONFIG_OF_VIDEOMODE)
/**
* of_get_drm_display_mode - get a drm_display_mode from devicetree
* @np: device_node with the timing specification
* @dmode: will be set to the return value
* @index: index into the list of display timings in devicetree
*
* This function is expensive and should only be used, if only one mode is to be
* read from DT. To get multiple modes start with of_get_display_timings and
* work with that instead.
*/
int of_get_drm_display_mode(struct device_node *np,
struct drm_display_mode *dmode, int index)
{
struct videomode vm;
int ret;
ret = of_get_videomode(np, &vm, index);
if (ret)
return ret;
drm_display_mode_from_videomode(&vm, dmode);
pr_debug("%s: got %dx%d display mode from %s\n",
of_node_full_name(np), vm.hactive, vm.vactive, np->name);
drm_mode_debug_printmodeline(dmode);
return 0;
}
EXPORT_SYMBOL_GPL(of_get_drm_display_mode);
#endif
/**
* drm_mode_set_name - set the name on a mode
* @mode: name will be set in this mode
......
......@@ -33,6 +33,27 @@ config VIDEO_OUTPUT_CONTROL
This framework adds support for low-level control of the video
output switch.
config DISPLAY_TIMING
bool
config VIDEOMODE
bool
config OF_DISPLAY_TIMING
bool "Enable device tree display timing support"
depends on OF
select DISPLAY_TIMING
help
helper to parse display timings from the devicetree
config OF_VIDEOMODE
bool "Enable device tree videomode support"
depends on OF
select VIDEOMODE
select OF_DISPLAY_TIMING
help
helper to get videomodes from the devicetree
menuconfig FB
tristate "Support for frame buffer devices"
---help---
......
......@@ -168,3 +168,7 @@ obj-$(CONFIG_FB_VIRTUAL) += vfb.o
#video output switch sysfs driver
obj-$(CONFIG_VIDEO_OUTPUT_CONTROL) += output.o
obj-$(CONFIG_DISPLAY_TIMING) += display_timing.o
obj-$(CONFIG_OF_DISPLAY_TIMING) += of_display_timing.o
obj-$(CONFIG_VIDEOMODE) += videomode.o
obj-$(CONFIG_OF_VIDEOMODE) += of_videomode.o
/*
* generic display timing functions
*
* Copyright (c) 2012 Steffen Trumtrar <s.trumtrar@pengutronix.de>, Pengutronix
*
* This file is released under the GPLv2
*/
#include <linux/export.h>
#include <linux/slab.h>
#include <video/display_timing.h>
void display_timings_release(struct display_timings *disp)
{
if (disp->timings) {
unsigned int i;
for (i = 0; i < disp->num_timings; i++)
kfree(disp->timings[i]);
kfree(disp->timings);
}
kfree(disp);
}
EXPORT_SYMBOL_GPL(display_timings_release);
......@@ -31,6 +31,8 @@
#include <linux/pci.h>
#include <linux/slab.h>
#include <video/edid.h>
#include <video/of_videomode.h>
#include <video/videomode.h>
#ifdef CONFIG_PPC_OF
#include <asm/prom.h>
#include <asm/pci-bridge.h>
......@@ -1373,6 +1375,98 @@ int fb_get_mode(int flags, u32 val, struct fb_var_screeninfo *var, struct fb_inf
kfree(timings);
return err;
}
#if IS_ENABLED(CONFIG_VIDEOMODE)
int fb_videomode_from_videomode(const struct videomode *vm,
struct fb_videomode *fbmode)
{
unsigned int htotal, vtotal;
fbmode->xres = vm->hactive;
fbmode->left_margin = vm->hback_porch;
fbmode->right_margin = vm->hfront_porch;
fbmode->hsync_len = vm->hsync_len;
fbmode->yres = vm->vactive;
fbmode->upper_margin = vm->vback_porch;
fbmode->lower_margin = vm->vfront_porch;
fbmode->vsync_len = vm->vsync_len;
/* prevent division by zero in KHZ2PICOS macro */
fbmode->pixclock = vm->pixelclock ?
KHZ2PICOS(vm->pixelclock / 1000) : 0;
fbmode->sync = 0;
fbmode->vmode = 0;
if (vm->dmt_flags & VESA_DMT_HSYNC_HIGH)
fbmode->sync |= FB_SYNC_HOR_HIGH_ACT;
if (vm->dmt_flags & VESA_DMT_HSYNC_HIGH)
fbmode->sync |= FB_SYNC_VERT_HIGH_ACT;
if (vm->data_flags & DISPLAY_FLAGS_INTERLACED)
fbmode->vmode |= FB_VMODE_INTERLACED;
if (vm->data_flags & DISPLAY_FLAGS_DOUBLESCAN)
fbmode->vmode |= FB_VMODE_DOUBLE;
fbmode->flag = 0;
htotal = vm->hactive + vm->hfront_porch + vm->hback_porch +
vm->hsync_len;
vtotal = vm->vactive + vm->vfront_porch + vm->vback_porch +
vm->vsync_len;
/* prevent division by zero */
if (htotal && vtotal) {
fbmode->refresh = vm->pixelclock / (htotal * vtotal);
/* a mode must have htotal and vtotal != 0 or it is invalid */
} else {
fbmode->refresh = 0;
return -EINVAL;
}
return 0;
}
EXPORT_SYMBOL_GPL(fb_videomode_from_videomode);
#endif
#if IS_ENABLED(CONFIG_OF_VIDEOMODE)
static inline void dump_fb_videomode(const struct fb_videomode *m)
{
pr_debug("fb_videomode = %ux%u@%uHz (%ukHz) %u %u %u %u %u %u %u %u %u\n",
m->xres, m->yres, m->refresh, m->pixclock, m->left_margin,
m->right_margin, m->upper_margin, m->lower_margin,
m->hsync_len, m->vsync_len, m->sync, m->vmode, m->flag);
}
/**
* of_get_fb_videomode - get a fb_videomode from devicetree
* @np: device_node with the timing specification
* @fb: will be set to the return value
* @index: index into the list of display timings in devicetree
*
* DESCRIPTION:
* This function is expensive and should only be used, if only one mode is to be
* read from DT. To get multiple modes start with of_get_display_timings ond
* work with that instead.
*/
int of_get_fb_videomode(struct device_node *np, struct fb_videomode *fb,
int index)
{
struct videomode vm;
int ret;
ret = of_get_videomode(np, &vm, index);
if (ret)
return ret;
fb_videomode_from_videomode(&vm, fb);
pr_debug("%s: got %dx%d display mode from %s\n",
of_node_full_name(np), vm.hactive, vm.vactive, np->name);
dump_fb_videomode(fb);
return 0;
}
EXPORT_SYMBOL_GPL(of_get_fb_videomode);
#endif
#else
int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var)
{
......
/*
* OF helpers for parsing display timings
*
* Copyright (c) 2012 Steffen Trumtrar <s.trumtrar@pengutronix.de>, Pengutronix
*
* based on of_videomode.c by Sascha Hauer <s.hauer@pengutronix.de>
*
* This file is released under the GPLv2
*/
#include <linux/export.h>
#include <linux/of.h>
#include <linux/slab.h>
#include <video/display_timing.h>
#include <video/of_display_timing.h>
/**
* parse_timing_property - parse timing_entry from device_node
* @np: device_node with the property
* @name: name of the property
* @result: will be set to the return value
*
* DESCRIPTION:
* Every display_timing can be specified with either just the typical value or
* a range consisting of min/typ/max. This function helps handling this
**/
static int parse_timing_property(struct device_node *np, const char *name,
struct timing_entry *result)
{
struct property *prop;
int length, cells, ret;
prop = of_find_property(np, name, &length);
if (!prop) {
pr_err("%s: could not find property %s\n",
of_node_full_name(np), name);
return -EINVAL;
}
cells = length / sizeof(u32);
if (cells == 1) {
ret = of_property_read_u32(np, name, &result->typ);
result->min = result->typ;
result->max = result->typ;
} else if (cells == 3) {
ret = of_property_read_u32_array(np, name, &result->min, cells);
} else {
pr_err("%s: illegal timing specification in %s\n",
of_node_full_name(np), name);
return -EINVAL;
}
return ret;
}
/**
* of_get_display_timing - parse display_timing entry from device_node
* @np: device_node with the properties
**/
static struct display_timing *of_get_display_timing(struct device_node *np)
{
struct display_timing *dt;
u32 val = 0;
int ret = 0;
dt = kzalloc(sizeof(*dt), GFP_KERNEL);
if (!dt) {
pr_err("%s: could not allocate display_timing struct\n",
of_node_full_name(np));
return NULL;
}
ret |= parse_timing_property(np, "hback-porch", &dt->hback_porch);
ret |= parse_timing_property(np, "hfront-porch", &dt->hfront_porch);
ret |= parse_timing_property(np, "hactive", &dt->hactive);
ret |= parse_timing_property(np, "hsync-len", &dt->hsync_len);
ret |= parse_timing_property(np, "vback-porch", &dt->vback_porch);
ret |= parse_timing_property(np, "vfront-porch", &dt->vfront_porch);
ret |= parse_timing_property(np, "vactive", &dt->vactive);
ret |= parse_timing_property(np, "vsync-len", &dt->vsync_len);
ret |= parse_timing_property(np, "clock-frequency", &dt->pixelclock);
dt->dmt_flags = 0;
dt->data_flags = 0;
if (!of_property_read_u32(np, "vsync-active", &val))
dt->dmt_flags |= val ? VESA_DMT_VSYNC_HIGH :
VESA_DMT_VSYNC_LOW;
if (!of_property_read_u32(np, "hsync-active", &val))
dt->dmt_flags |= val ? VESA_DMT_HSYNC_HIGH :
VESA_DMT_HSYNC_LOW;
if (!of_property_read_u32(np, "de-active", &val))
dt->data_flags |= val ? DISPLAY_FLAGS_DE_HIGH :
DISPLAY_FLAGS_DE_LOW;
if (!of_property_read_u32(np, "pixelclk-active", &val))
dt->data_flags |= val ? DISPLAY_FLAGS_PIXDATA_POSEDGE :
DISPLAY_FLAGS_PIXDATA_NEGEDGE;
if (of_property_read_bool(np, "interlaced"))
dt->data_flags |= DISPLAY_FLAGS_INTERLACED;
if (of_property_read_bool(np, "doublescan"))
dt->data_flags |= DISPLAY_FLAGS_DOUBLESCAN;
if (ret) {
pr_err("%s: error reading timing properties\n",
of_node_full_name(np));
kfree(dt);
return NULL;
}
return dt;
}
/**
* of_get_display_timings - parse all display_timing entries from a device_node
* @np: device_node with the subnodes
**/
struct display_timings *of_get_display_timings(struct device_node *np)
{
struct device_node *timings_np;
struct device_node *entry;
struct device_node *native_mode;
struct display_timings *disp;
if (!np) {
pr_err("%s: no devicenode given\n", of_node_full_name(np));
return NULL;
}
timings_np = of_find_node_by_name(np, "display-timings");
if (!timings_np) {
pr_err("%s: could not find display-timings node\n",
of_node_full_name(np));
return NULL;
}
disp = kzalloc(sizeof(*disp), GFP_KERNEL);
if (!disp) {
pr_err("%s: could not allocate struct disp'\n",
of_node_full_name(np));
goto dispfail;
}
entry = of_parse_phandle(timings_np, "native-mode", 0);
/* assume first child as native mode if none provided */
if (!entry)
entry = of_get_next_child(np, NULL);
/* if there is no child, it is useless to go on */
if (!entry) {
pr_err("%s: no timing specifications given\n",
of_node_full_name(np));
goto entryfail;
}
pr_debug("%s: using %s as default timing\n",
of_node_full_name(np), entry->name);
native_mode = entry;
disp->num_timings = of_get_child_count(timings_np);
if (disp->num_timings == 0) {
/* should never happen, as entry was already found above */
pr_err("%s: no timings specified\n", of_node_full_name(np));
goto entryfail;
}
disp->timings = kzalloc(sizeof(struct display_timing *) *
disp->num_timings, GFP_KERNEL);
if (!disp->timings) {
pr_err("%s: could not allocate timings array\n",
of_node_full_name(np));
goto entryfail;
}
disp->num_timings = 0;
disp->native_mode = 0;
for_each_child_of_node(timings_np, entry) {
struct display_timing *dt;
dt = of_get_display_timing(entry);
if (!dt) {
/*
* to not encourage wrong devicetrees, fail in case of
* an error
*/
pr_err("%s: error in timing %d\n",
of_node_full_name(np), disp->num_timings + 1);
goto timingfail;
}
if (native_mode == entry)
disp->native_mode = disp->num_timings;
disp->timings[disp->num_timings] = dt;
disp->num_timings++;
}
of_node_put(timings_np);
/*
* native_mode points to the device_node returned by of_parse_phandle
* therefore call of_node_put on it
*/
of_node_put(native_mode);
pr_debug("%s: got %d timings. Using timing #%d as default\n",
of_node_full_name(np), disp->num_timings,
disp->native_mode + 1);
return disp;
timingfail:
if (native_mode)
of_node_put(native_mode);
display_timings_release(disp);
entryfail:
kfree(disp);
dispfail:
of_node_put(timings_np);
return NULL;
}
EXPORT_SYMBOL_GPL(of_get_display_timings);
/**
* of_display_timings_exist - check if a display-timings node is provided
* @np: device_node with the timing
**/
int of_display_timings_exist(struct device_node *np)
{
struct device_node *timings_np;
if (!np)
return -EINVAL;
timings_np = of_parse_phandle(np, "display-timings", 0);
if (!timings_np)
return -EINVAL;
of_node_put(timings_np);
return 1;
}
EXPORT_SYMBOL_GPL(of_display_timings_exist);
/*
* generic videomode helper
*
* Copyright (c) 2012 Steffen Trumtrar <s.trumtrar@pengutronix.de>, Pengutronix
*
* This file is released under the GPLv2
*/
#include <linux/errno.h>
#include <linux/export.h>
#include <linux/of.h>
#include <video/display_timing.h>
#include <video/of_display_timing.h>
#include <video/of_videomode.h>
#include <video/videomode.h>
/**
* of_get_videomode - get the videomode #<index> from devicetree
* @np - devicenode with the display_timings
* @vm - set to return value
* @index - index into list of display_timings
* (Set this to OF_USE_NATIVE_MODE to use whatever mode is
* specified as native mode in the DT.)
*
* DESCRIPTION:
* Get a list of all display timings and put the one
* specified by index into *vm. This function should only be used, if
* only one videomode is to be retrieved. A driver that needs to work
* with multiple/all videomodes should work with
* of_get_display_timings instead.
**/
int of_get_videomode(struct device_node *np, struct videomode *vm,
int index)
{
struct display_timings *disp;
int ret;
disp = of_get_display_timings(np);
if (!disp) {
pr_err("%s: no timings specified\n", of_node_full_name(np));
return -EINVAL;
}
if (index == OF_USE_NATIVE_MODE)
index = disp->native_mode;
ret = videomode_from_timing(disp, vm, index);
if (ret)
return ret;
display_timings_release(disp);
return 0;
}
EXPORT_SYMBOL_GPL(of_get_videomode);
......@@ -1467,10 +1467,10 @@ void viafb_set_vclock(u32 clk, int set_iga)
via_write_misc_reg_mask(0x0C, 0x0C); /* select external clock */
}
struct display_timing var_to_timing(const struct fb_var_screeninfo *var,
struct via_display_timing var_to_timing(const struct fb_var_screeninfo *var,
u16 cxres, u16 cyres)
{
struct display_timing timing;
struct via_display_timing timing;
u16 dx = (var->xres - cxres) / 2, dy = (var->yres - cyres) / 2;
timing.hor_addr = cxres;
......@@ -1491,7 +1491,7 @@ struct display_timing var_to_timing(const struct fb_var_screeninfo *var,
void viafb_fill_crtc_timing(const struct fb_var_screeninfo *var,
u16 cxres, u16 cyres, int iga)
{
struct display_timing crt_reg = var_to_timing(var,
struct via_display_timing crt_reg = var_to_timing(var,
cxres ? cxres : var->xres, cyres ? cyres : var->yres);
if (iga == IGA1)
......
......@@ -637,7 +637,7 @@ extern int viafb_LCD_ON;
extern int viafb_DVI_ON;
extern int viafb_hotplug;
struct display_timing var_to_timing(const struct fb_var_screeninfo *var,
struct via_display_timing var_to_timing(const struct fb_var_screeninfo *var,
u16 cxres, u16 cyres);
void viafb_fill_crtc_timing(const struct fb_var_screeninfo *var,
u16 cxres, u16 cyres, int iga);
......
......@@ -549,7 +549,7 @@ void viafb_lcd_set_mode(const struct fb_var_screeninfo *var, u16 cxres,
int panel_hres = plvds_setting_info->lcd_panel_hres;
int panel_vres = plvds_setting_info->lcd_panel_vres;
u32 clock;
struct display_timing timing;
struct via_display_timing timing;
struct fb_var_screeninfo panel_var;
const struct fb_videomode *mode_crt_table, *panel_crt_table;
......
......@@ -319,7 +319,7 @@ struct crt_mode_table {
int refresh_rate;
int h_sync_polarity;
int v_sync_polarity;
struct display_timing crtc;
struct via_display_timing crtc;
};
struct io_reg {
......
......@@ -30,9 +30,9 @@
#include "debug.h"
void via_set_primary_timing(const struct display_timing *timing)
void via_set_primary_timing(const struct via_display_timing *timing)
{
struct display_timing raw;
struct via_display_timing raw;
raw.hor_total = timing->hor_total / 8 - 5;
raw.hor_addr = timing->hor_addr / 8 - 1;
......@@ -88,9 +88,9 @@ void via_set_primary_timing(const struct display_timing *timing)
via_write_reg_mask(VIACR, 0x17, 0x80, 0x80);
}
void via_set_secondary_timing(const struct display_timing *timing)
void via_set_secondary_timing(const struct via_display_timing *timing)
{
struct display_timing raw;
struct via_display_timing raw;
raw.hor_total = timing->hor_total - 1;
raw.hor_addr = timing->hor_addr - 1;
......
......@@ -33,7 +33,7 @@
#define VIA_PITCH_MAX 0x3FF8
struct display_timing {
struct via_display_timing {
u16 hor_total;
u16 hor_addr;
u16 hor_blank_start;
......@@ -49,8 +49,8 @@ struct display_timing {
};
void via_set_primary_timing(const struct display_timing *timing);
void via_set_secondary_timing(const struct display_timing *timing);
void via_set_primary_timing(const struct via_display_timing *timing);
void via_set_secondary_timing(const struct via_display_timing *timing);
void via_set_primary_address(u32 addr);
void via_set_secondary_address(u32 addr);
void via_set_primary_pitch(u32 pitch);
......
/*
* generic display timing functions
*
* Copyright (c) 2012 Steffen Trumtrar <s.trumtrar@pengutronix.de>, Pengutronix
*
* This file is released under the GPLv2
*/
#include <linux/errno.h>
#include <linux/export.h>
#include <video/display_timing.h>
#include <video/videomode.h>
int videomode_from_timing(const struct display_timings *disp,
struct videomode *vm, unsigned int index)
{
struct display_timing *dt;
dt = display_timings_get(disp, index);
if (!dt)
return -EINVAL;
vm->pixelclock = display_timing_get_value(&dt->pixelclock, TE_TYP);
vm->hactive = display_timing_get_value(&dt->hactive, TE_TYP);
vm->hfront_porch = display_timing_get_value(&dt->hfront_porch, TE_TYP);
vm->hback_porch = display_timing_get_value(&dt->hback_porch, TE_TYP);
vm->hsync_len = display_timing_get_value(&dt->hsync_len, TE_TYP);
vm->vactive = display_timing_get_value(&dt->vactive, TE_TYP);
vm->vfront_porch = display_timing_get_value(&dt->vfront_porch, TE_TYP);
vm->vback_porch = display_timing_get_value(&dt->vback_porch, TE_TYP);
vm->vsync_len = display_timing_get_value(&dt->vsync_len, TE_TYP);
vm->dmt_flags = dt->dmt_flags;
vm->data_flags = dt->data_flags;
return 0;
}
EXPORT_SYMBOL_GPL(videomode_from_timing);
......@@ -85,6 +85,9 @@ struct module;
struct drm_file;
struct drm_device;
struct device_node;
struct videomode;
#include <drm/drm_os_linux.h>
#include <drm/drm_hashtab.h>
#include <drm/drm_mm.h>
......@@ -1469,6 +1472,12 @@ extern struct drm_display_mode *
drm_mode_create_from_cmdline_mode(struct drm_device *dev,
struct drm_cmdline_mode *cmd);
extern int drm_display_mode_from_videomode(const struct videomode *vm,
struct drm_display_mode *dmode);
extern int of_get_drm_display_mode(struct device_node *np,
struct drm_display_mode *dmode,
int index);
/* Modesetting support */
extern void drm_vblank_pre_modeset(struct drm_device *dev, int crtc);
extern void drm_vblank_post_modeset(struct drm_device *dev, int crtc);
......
......@@ -19,6 +19,8 @@ struct vm_area_struct;
struct fb_info;
struct device;
struct file;
struct videomode;
struct device_node;
/* Definitions below are used in the parsed monitor specs */
#define FB_DPMS_ACTIVE_OFF 1
......@@ -714,6 +716,12 @@ extern void fb_destroy_modedb(struct fb_videomode *modedb);
extern int fb_find_mode_cvt(struct fb_videomode *mode, int margins, int rb);
extern unsigned char *fb_ddc_read(struct i2c_adapter *adapter);
extern int of_get_fb_videomode(struct device_node *np,
struct fb_videomode *fb,
int index);
extern int fb_videomode_from_videomode(const struct videomode *vm,
struct fb_videomode *fbmode);
/* drivers/video/modedb.c */
#define VESA_MODEDB_SIZE 34
extern void fb_var_to_videomode(struct fb_videomode *mode,
......
/*
* Copyright 2012 Steffen Trumtrar <s.trumtrar@pengutronix.de>
*
* description of display timings
*
* This file is released under the GPLv2
*/
#ifndef __LINUX_DISPLAY_TIMING_H
#define __LINUX_DISPLAY_TIMING_H
#include <linux/bitops.h>
#include <linux/types.h>
/* VESA display monitor timing parameters */
#define VESA_DMT_HSYNC_LOW BIT(0)
#define VESA_DMT_HSYNC_HIGH BIT(1)
#define VESA_DMT_VSYNC_LOW BIT(2)
#define VESA_DMT_VSYNC_HIGH BIT(3)
/* display specific flags */
#define DISPLAY_FLAGS_DE_LOW BIT(0) /* data enable flag */
#define DISPLAY_FLAGS_DE_HIGH BIT(1)
#define DISPLAY_FLAGS_PIXDATA_POSEDGE BIT(2) /* drive data on pos. edge */
#define DISPLAY_FLAGS_PIXDATA_NEGEDGE BIT(3) /* drive data on neg. edge */
#define DISPLAY_FLAGS_INTERLACED BIT(4)
#define DISPLAY_FLAGS_DOUBLESCAN BIT(5)
/*
* A single signal can be specified via a range of minimal and maximal values
* with a typical value, that lies somewhere inbetween.
*/
struct timing_entry {
u32 min;
u32 typ;
u32 max;
};
enum timing_entry_index {
TE_MIN = 0,
TE_TYP = 1,
TE_MAX = 2,
};
/*
* Single "mode" entry. This describes one set of signal timings a display can
* have in one setting. This struct can later be converted to struct videomode
* (see include/video/videomode.h). As each timing_entry can be defined as a
* range, one struct display_timing may become multiple struct videomodes.
*
* Example: hsync active high, vsync active low
*
* Active Video
* Video ______________________XXXXXXXXXXXXXXXXXXXXXX_____________________
* |<- sync ->|<- back ->|<----- active ----->|<- front ->|<- sync..
* | | porch | | porch |
*
* HSync _|¯¯¯¯¯¯¯¯¯¯|___________________________________________|¯¯¯¯¯¯¯¯¯
*
* VSync ¯|__________|¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯|_________
*/
struct display_timing {
struct timing_entry pixelclock;
struct timing_entry hactive; /* hor. active video */
struct timing_entry hfront_porch; /* hor. front porch */
struct timing_entry hback_porch; /* hor. back porch */
struct timing_entry hsync_len; /* hor. sync len */
struct timing_entry vactive; /* ver. active video */
struct timing_entry vfront_porch; /* ver. front porch */
struct timing_entry vback_porch; /* ver. back porch */
struct timing_entry vsync_len; /* ver. sync len */
unsigned int dmt_flags; /* VESA DMT flags */
unsigned int data_flags; /* video data flags */
};
/*
* This describes all timing settings a display provides.
* The native_mode is the default setting for this display.
* Drivers that can handle multiple videomodes should work with this struct and
* convert each entry to the desired end result.
*/
struct display_timings {
unsigned int num_timings;
unsigned int native_mode;
struct display_timing **timings;
};
/* get value specified by index from struct timing_entry */
static inline u32 display_timing_get_value(const struct timing_entry *te,
enum timing_entry_index index)
{
switch (index) {
case TE_MIN:
return te->min;
break;
case TE_TYP:
return te->typ;
break;
case TE_MAX:
return te->max;
break;
default:
return te->typ;
}
}
/* get one entry from struct display_timings */
static inline struct display_timing *display_timings_get(const struct
display_timings *disp,
unsigned int index)
{
if (disp->num_timings > index)
return disp->timings[index];
else
return NULL;
}
void display_timings_release(struct display_timings *disp);
#endif
/*
* Copyright 2012 Steffen Trumtrar <s.trumtrar@pengutronix.de>
*
* display timings of helpers
*
* This file is released under the GPLv2
*/
#ifndef __LINUX_OF_DISPLAY_TIMING_H
#define __LINUX_OF_DISPLAY_TIMING_H
struct device_node;
struct display_timings;
#define OF_USE_NATIVE_MODE -1
struct display_timings *of_get_display_timings(struct device_node *np);
int of_display_timings_exist(struct device_node *np);
#endif
/*
* Copyright 2012 Steffen Trumtrar <s.trumtrar@pengutronix.de>
*
* videomode of-helpers
*
* This file is released under the GPLv2
*/
#ifndef __LINUX_OF_VIDEOMODE_H
#define __LINUX_OF_VIDEOMODE_H
struct device_node;
struct videomode;
int of_get_videomode(struct device_node *np, struct videomode *vm,
int index);
#endif /* __LINUX_OF_VIDEOMODE_H */
/*
* Copyright 2012 Steffen Trumtrar <s.trumtrar@pengutronix.de>
*
* generic videomode description
*
* This file is released under the GPLv2
*/
#ifndef __LINUX_VIDEOMODE_H
#define __LINUX_VIDEOMODE_H
#include <linux/types.h>
#include <video/display_timing.h>
/*
* Subsystem independent description of a videomode.
* Can be generated from struct display_timing.
*/
struct videomode {
unsigned long pixelclock; /* pixelclock in Hz */
u32 hactive;
u32 hfront_porch;
u32 hback_porch;
u32 hsync_len;
u32 vactive;
u32 vfront_porch;
u32 vback_porch;
u32 vsync_len;
unsigned int dmt_flags; /* VESA DMT flags */
unsigned int data_flags; /* video data flags */
};
/**
* videomode_from_timing - convert display timing to videomode
* @disp: structure with all possible timing entries
* @vm: return value
* @index: index into the list of display timings in devicetree
*
* DESCRIPTION:
* This function converts a struct display_timing to a struct videomode.
*/
int videomode_from_timing(const struct display_timings *disp,
struct videomode *vm, unsigned int index);
#endif
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