Commit 734e4c97 authored by Eryk Brol's avatar Eryk Brol Committed by Alex Deucher

drm/amd/display: DSC Slice height debugfs write entry

[Why]
We need to be able to specify slice height for any connector's DSC

[How]
Overwrite computed parameters in dsc_cfg, with the value needed/
Overwrites for both SST and MST connectors, but in different places, but the process is identical. Overwrites only if DSC is decided to be enabled on that connector.
Signed-off-by: default avatarEryk Brol <eryk.brol@amd.com>
Signed-off-by: default avatarMikita Lipski <mikita.lipski@amd.com>
Reviewed-by: default avatarMikita Lipski <Mikita.Lipski@amd.com>
Acked-by: default avatarAurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent 4bfb7428
......@@ -4670,9 +4670,14 @@ create_stream_for_sink(struct amdgpu_dm_connector *aconnector,
/* Overwrite the stream flag if DSC is enabled through debugfs */
if (aconnector->dsc_settings.dsc_clock_en)
stream->timing.flags.DSC = 1;
if (stream->timing.flags.DSC && aconnector->dsc_settings.dsc_slice_width)
stream->timing.dsc_cfg.num_slices_h = DIV_ROUND_UP(stream->timing.h_addressable,
aconnector->dsc_settings.dsc_slice_width);
if (stream->timing.flags.DSC && aconnector->dsc_settings.dsc_slice_height)
stream->timing.dsc_cfg.num_slices_v = DIV_ROUND_UP(stream->timing.v_addressable,
aconnector->dsc_settings.dsc_slice_height);
}
#endif
}
......
......@@ -345,6 +345,7 @@ struct amdgpu_display_manager {
struct dsc_preferred_settings {
bool dsc_clock_en;
uint32_t dsc_slice_width;
uint32_t dsc_slice_height;
};
struct amdgpu_dm_connector {
......
......@@ -1274,6 +1274,22 @@ static ssize_t dp_dsc_slice_width_write(struct file *f, const char __user *buf,
return size;
}
/* function: read DSC slice height parameter on the connector
*
* The read function: dp_dsc_slice_height_read
* returns dsc slice height used in the current configuration
* The return is an integer: 0 or other positive number
*
* Access the status with the following command:
*
* cat /sys/kernel/debug/dri/0/DP-X/dsc_slice_height
*
* 0 - means that DSC is disabled
*
* Any other number more than zero represents the
* slice height currently used by DSC in pixels
*
*/
static ssize_t dp_dsc_slice_height_read(struct file *f, char __user *buf,
size_t size, loff_t *pos)
{
......@@ -1331,6 +1347,82 @@ static ssize_t dp_dsc_slice_height_read(struct file *f, char __user *buf,
return result;
}
/* function: write DSC slice height parameter
*
* The write function: dp_dsc_slice_height_write
* overwrites automatically generated DSC configuration
* of slice height.
*
* The user has to write the slice height divisible by the
* picture height.
*
* Also the user has to write height in hexidecimal
* rather than in decimal.
*
* Writing DSC settings is done with the following command:
* - To force overwrite slice height (example sets to 128 pixels):
*
* echo 0x80 > /sys/kernel/debug/dri/0/DP-X/dsc_slice_height
*
* - To stop overwriting and let driver find the optimal size,
* set the height to zero:
*
* echo 0x0 > /sys/kernel/debug/dri/0/DP-X/dsc_slice_height
*
*/
static ssize_t dp_dsc_slice_height_write(struct file *f, const char __user *buf,
size_t size, loff_t *pos)
{
struct amdgpu_dm_connector *aconnector = file_inode(f)->i_private;
struct pipe_ctx *pipe_ctx;
int i;
char *wr_buf = NULL;
uint32_t wr_buf_size = 42;
int max_param_num = 1;
uint8_t param_nums = 0;
long param[1] = {0};
if (size == 0)
return -EINVAL;
wr_buf = kcalloc(wr_buf_size, sizeof(char), GFP_KERNEL);
if (!wr_buf) {
DRM_DEBUG_DRIVER("no memory to allocate write buffer\n");
return -ENOSPC;
}
if (parse_write_buffer_into_params(wr_buf, wr_buf_size,
(long *)param, buf,
max_param_num,
&param_nums)) {
kfree(wr_buf);
return -EINVAL;
}
if (param_nums <= 0) {
DRM_DEBUG_DRIVER("user data not be read\n");
kfree(wr_buf);
return -EINVAL;
}
for (i = 0; i < MAX_PIPES; i++) {
pipe_ctx = &aconnector->dc_link->dc->current_state->res_ctx.pipe_ctx[i];
if (pipe_ctx && pipe_ctx->stream &&
pipe_ctx->stream->link == aconnector->dc_link)
break;
}
if (!pipe_ctx || !pipe_ctx->stream)
goto done;
aconnector->dsc_settings.dsc_slice_height = param[0];
done:
kfree(wr_buf);
return size;
}
static ssize_t dp_dsc_bits_per_pixel_read(struct file *f, char __user *buf,
size_t size, loff_t *pos)
{
......@@ -1640,6 +1732,7 @@ static const struct file_operations dp_dsc_slice_width_debugfs_fops = {
static const struct file_operations dp_dsc_slice_height_debugfs_fops = {
.owner = THIS_MODULE,
.read = dp_dsc_slice_height_read,
.write = dp_dsc_slice_height_write,
.llseek = default_llseek
};
......
......@@ -452,6 +452,7 @@ struct dsc_mst_fairness_params {
struct drm_dp_mst_port *port;
bool clock_overwrite;
uint32_t slice_width_overwrite;
uint32_t slice_height_overwrite;
};
struct dsc_mst_fairness_vars {
......@@ -490,6 +491,11 @@ static void set_dsc_configs_from_fairness_vars(struct dsc_mst_fairness_params *p
params[i].timing->dsc_cfg.num_slices_h = DIV_ROUND_UP(
params[i].timing->h_addressable,
params[i].slice_width_overwrite);
if (params[i].slice_height_overwrite)
params[i].timing->dsc_cfg.num_slices_v = DIV_ROUND_UP(
params[i].timing->v_addressable,
params[i].slice_height_overwrite);
} else {
params[i].timing->flags.DSC = 0;
}
......@@ -707,6 +713,7 @@ static bool compute_mst_dsc_configs_for_link(struct drm_atomic_state *state,
if (params[count].clock_overwrite)
debugfs_overwrite = true;
params[count].slice_width_overwrite = aconnector->dsc_settings.dsc_slice_width;
params[count].slice_height_overwrite = aconnector->dsc_settings.dsc_slice_height;
params[count].compression_possible = stream->sink->dsc_caps.dsc_dec_caps.is_dsc_supported;
dc_dsc_get_policy_for_timing(params[count].timing, &dsc_policy);
if (!dc_dsc_compute_bandwidth_range(
......
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