drm: renesas: shmobile: Remove backlight support

Backlight support should be implemented by panels, not by the LCDC
driver.  As the feature is currently unused anyway, remove it.
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
[geert: Cleanups]
Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/69707650245bc2193d072f24723d4d5482ea590b.1694767209.git.geert+renesas@glider.be

drivers/gpu/drm/renesas/shmobile/Makefile

 # SPDX-License-Identifier: GPL-2.0
-shmob-drm-y := shmob_drm_backlight.o \
-	       shmob_drm_crtc.o \
+shmob-drm-y := shmob_drm_crtc.o \
 	       shmob_drm_drv.o \
 	       shmob_drm_kms.o \
 	       shmob_drm_plane.o

drivers/gpu/drm/renesas/shmobile/shmob_drm_backlight.c

-// SPDX-License-Identifier: GPL-2.0+
-/*
- * shmob_drm_backlight.c  --  SH Mobile DRM Backlight
- *
- * Copyright (C) 2012 Renesas Electronics Corporation
- *
- * Laurent Pinchart (laurent.pinchart@ideasonboard.com)
- */
-
-#include <linux/backlight.h>
-
-#include "shmob_drm_backlight.h"
-#include "shmob_drm_crtc.h"
-#include "shmob_drm_drv.h"
-
-static int shmob_drm_backlight_update(struct backlight_device *bdev)
-{
-	struct shmob_drm_connector *scon = bl_get_data(bdev);
-	struct shmob_drm_device *sdev = scon->connector.dev->dev_private;
-	const struct shmob_drm_backlight_data *bdata = &sdev->pdata->backlight;
-	int brightness = backlight_get_brightness(bdev);
-
-	return bdata->set_brightness(brightness);
-}
-
-static int shmob_drm_backlight_get_brightness(struct backlight_device *bdev)
-{
-	struct shmob_drm_connector *scon = bl_get_data(bdev);
-	struct shmob_drm_device *sdev = scon->connector.dev->dev_private;
-	const struct shmob_drm_backlight_data *bdata = &sdev->pdata->backlight;
-
-	return bdata->get_brightness();
-}
-
-static const struct backlight_ops shmob_drm_backlight_ops = {
-	.options	= BL_CORE_SUSPENDRESUME,
-	.update_status	= shmob_drm_backlight_update,
-	.get_brightness	= shmob_drm_backlight_get_brightness,
-};
-
-void shmob_drm_backlight_dpms(struct shmob_drm_connector *scon, int mode)
-{
-	if (scon->backlight == NULL)
-		return;
-
-	scon->backlight->props.power = mode == DRM_MODE_DPMS_ON
-				     ? FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
-	backlight_update_status(scon->backlight);
-}
-
-int shmob_drm_backlight_init(struct shmob_drm_connector *scon)
-{
-	struct shmob_drm_device *sdev = scon->connector.dev->dev_private;
-	const struct shmob_drm_backlight_data *bdata = &sdev->pdata->backlight;
-	struct drm_connector *connector = &scon->connector;
-	struct drm_device *dev = connector->dev;
-	struct backlight_device *backlight;
-
-	if (!bdata->max_brightness)
-		return 0;
-
-	backlight = backlight_device_register(bdata->name, dev->dev, scon,
-					      &shmob_drm_backlight_ops, NULL);
-	if (IS_ERR(backlight)) {
-		dev_err(dev->dev, "unable to register backlight device: %ld\n",
-			PTR_ERR(backlight));
-		return PTR_ERR(backlight);
-	}
-
-	backlight->props.max_brightness = bdata->max_brightness;
-	backlight->props.brightness = bdata->max_brightness;
-	backlight->props.power = FB_BLANK_POWERDOWN;
-	backlight_update_status(backlight);
-
-	scon->backlight = backlight;
-	return 0;
-}
-
-void shmob_drm_backlight_exit(struct shmob_drm_connector *scon)
-{
-	backlight_device_unregister(scon->backlight);
-}

drivers/gpu/drm/renesas/shmobile/shmob_drm_backlight.h

-/* SPDX-License-Identifier: GPL-2.0+ */
-/*
- * shmob_drm_backlight.h  --  SH Mobile DRM Backlight
- *
- * Copyright (C) 2012 Renesas Electronics Corporation
- *
- * Laurent Pinchart (laurent.pinchart@ideasonboard.com)
- */
-
-#ifndef __SHMOB_DRM_BACKLIGHT_H__
-#define __SHMOB_DRM_BACKLIGHT_H__
-
-struct shmob_drm_connector;
-
-void shmob_drm_backlight_dpms(struct shmob_drm_connector *scon, int mode);
-int shmob_drm_backlight_init(struct shmob_drm_connector *scon);
-void shmob_drm_backlight_exit(struct shmob_drm_connector *scon);
-
-#endif /* __SHMOB_DRM_BACKLIGHT_H__ */

drivers/gpu/drm/renesas/shmobile/shmob_drm_crtc.c

@@ -7,7 +7,6 @@
  * Laurent Pinchart (laurent.pinchart@ideasonboard.com)
  */
 
-#include <linux/backlight.h>
 #include <linux/clk.h>
 #include <linux/pm_runtime.h>
 
@@ -24,7 +23,6 @@
 #include <drm/drm_simple_kms_helper.h>
 #include <drm/drm_vblank.h>
 
-#include "shmob_drm_backlight.h"
 #include "shmob_drm_crtc.h"
 #include "shmob_drm_drv.h"
 #include "shmob_drm_kms.h"
@@ -487,21 +485,9 @@ int shmob_drm_crtc_create(struct shmob_drm_device *sdev)
  * Encoder
  */
 
-#define to_shmob_encoder(e) \
-	container_of(e, struct shmob_drm_encoder, encoder)
-
 static void shmob_drm_encoder_dpms(struct drm_encoder *encoder, int mode)
 {
-	struct shmob_drm_encoder *senc = to_shmob_encoder(encoder);
-	struct shmob_drm_device *sdev = encoder->dev->dev_private;
-	struct shmob_drm_connector *scon = &sdev->connector;
-
-	if (senc->dpms == mode)
-		return;
-
-	shmob_drm_backlight_dpms(scon, mode);
-
-	senc->dpms = mode;
+	/* No-op, everything is handled in the CRTC code. */
 }
 
 static bool shmob_drm_encoder_mode_fixup(struct drm_encoder *encoder,
@@ -553,11 +539,9 @@ static const struct drm_encoder_helper_funcs encoder_helper_funcs = {
 
 int shmob_drm_encoder_create(struct shmob_drm_device *sdev)
 {
-	struct drm_encoder *encoder = &sdev->encoder.encoder;
+	struct drm_encoder *encoder = &sdev->encoder;
 	int ret;
 
-	sdev->encoder.dpms = DRM_MODE_DPMS_OFF;
-
 	encoder->possible_crtcs = 1;
 
 	ret = drm_simple_encoder_init(sdev->ddev, encoder,
@@ -622,9 +606,6 @@ static const struct drm_connector_helper_funcs connector_helper_funcs = {
 
 static void shmob_drm_connector_destroy(struct drm_connector *connector)
 {
-	struct shmob_drm_connector *scon = to_shmob_connector(connector);
-
-	shmob_drm_backlight_exit(scon);
 	drm_connector_unregister(connector);
 	drm_connector_cleanup(connector);
 }
@@ -653,13 +634,9 @@ int shmob_drm_connector_create(struct shmob_drm_device *sdev,
 
 	drm_connector_helper_add(connector, &connector_helper_funcs);
 
-	ret = shmob_drm_backlight_init(&sdev->connector);
-	if (ret < 0)
-		goto err_cleanup;
-
 	ret = drm_connector_attach_encoder(connector, encoder);
 	if (ret < 0)
-		goto err_backlight;
+		goto error;
 
 	drm_helper_connector_dpms(connector, DRM_MODE_DPMS_OFF);
 	drm_object_property_set_value(&connector->base,
@@ -667,9 +644,7 @@ int shmob_drm_connector_create(struct shmob_drm_device *sdev,
 
 	return 0;
 
-err_backlight:
-	shmob_drm_backlight_exit(&sdev->connector);
-err_cleanup:
+error:
 	drm_connector_cleanup(connector);
 	return ret;
 }

drivers/gpu/drm/renesas/shmobile/shmob_drm_crtc.h

@@ -14,7 +14,6 @@
 #include <drm/drm_connector.h>
 #include <drm/drm_encoder.h>
 
-struct backlight_device;
 struct drm_pending_vblank_event;
 struct shmob_drm_device;
 struct shmob_drm_format_info;
@@ -31,16 +30,9 @@ struct shmob_drm_crtc {
 	bool started;
 };
 
-struct shmob_drm_encoder {
-	struct drm_encoder encoder;
-	int dpms;
-};
-
 struct shmob_drm_connector {
 	struct drm_connector connector;
 	struct drm_encoder *encoder;
-
-	struct backlight_device *backlight;
 };
 
 int shmob_drm_crtc_create(struct shmob_drm_device *sdev);

drivers/gpu/drm/renesas/shmobile/shmob_drm_drv.h

@@ -35,7 +35,7 @@ struct shmob_drm_device {
 	struct drm_device *ddev;
 
 	struct shmob_drm_crtc crtc;
-	struct shmob_drm_encoder encoder;
+	struct drm_encoder encoder;
 	struct shmob_drm_connector connector;
 };
 

drivers/gpu/drm/renesas/shmobile/shmob_drm_kms.c

@@ -159,7 +159,7 @@ int shmob_drm_modeset_init(struct shmob_drm_device *sdev)
 
 	shmob_drm_crtc_create(sdev);
 	shmob_drm_encoder_create(sdev);
-	shmob_drm_connector_create(sdev, &sdev->encoder.encoder);
+	shmob_drm_connector_create(sdev, &sdev->encoder);
 
 	drm_kms_helper_poll_init(sdev->ddev);
 

include/linux/platform_data/shmob_drm.h

@@ -40,13 +40,6 @@ enum shmob_drm_interface {
 	SHMOB_DRM_IFACE_SYS24,		/* 24bpp */
 };
 
-struct shmob_drm_backlight_data {
-	const char *name;
-	int max_brightness;
-	int (*get_brightness)(void);
-	int (*set_brightness)(int brightness);
-};
-
 struct shmob_drm_panel_data {
 	unsigned int width_mm;		/* Panel width in mm */
 	unsigned int height_mm;		/* Panel height in mm */
@@ -83,7 +76,6 @@ struct shmob_drm_platform_data {
 	enum shmob_drm_clk_source clk_source;
 	struct shmob_drm_interface_data iface;
 	struct shmob_drm_panel_data panel;
-	struct shmob_drm_backlight_data backlight;
 };
 
 #endif /* __SHMOB_DRM_H__ */