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drm/amd/display: Comments on how to use DSC debugfs some entries 

[why]
Some of the DSC debugfs read enteries are missing comments
explaining how to use and how to comprehend the results.

Signed-off-by: Eryk Brol <eryk.brol@amd.com>
Signed-off-by: Mikita Lipski <mikita.lipski@amd.com>
Reviewed-by: Mikita Lipski <Mikita.Lipski@amd.com>
Acked-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Eryk Brol 2020-06-19 14:07:03 -04:00 committed by Alex Deucher
parent 06ff02fc1e
commit 87353ae837
1 changed files with 45 additions and 0 deletions
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45
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c
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@ -1565,6 +1565,21 @@ done:
return size;
}
/* function: read DSC picture width parameter on the connector
*
* The read function: dp_dsc_pic_width_read
* returns dsc picture width used in the current configuration
* It is the same as h_addressable of the current
* display's timing
* The return is an integer: 0 or other positive integer
* If 0 then DSC is disabled.
*
* Access it with the following command:
*
* cat /sys/kernel/debug/dri/0/DP-X/dsc_pic_width
*
* 0 - means that DSC is disabled
*/
static ssize_t dp_dsc_pic_width_read(struct file *f, char __user *buf,
size_t size, loff_t *pos)
{
@ -1679,6 +1694,21 @@ static ssize_t dp_dsc_pic_height_read(struct file *f, char __user *buf,
return result;
}
/* function: read DSC chunk size parameter on the connector
*
* The read function: dp_dsc_chunk_size_read
* returns dsc chunk size set in the current configuration
* The value is calculated automatically by DSC code
* and depends on slice parameters and bpp target rate
* The return is an integer: 0 or other positive integer
* If 0 then DSC is disabled.
*
* Access it with the following command:
*
* cat /sys/kernel/debug/dri/0/DP-X/dsc_chunk_size
*
* 0 - means that DSC is disabled
*/
static ssize_t dp_dsc_chunk_size_read(struct file *f, char __user *buf,
size_t size, loff_t *pos)
{
@ -1736,6 +1766,21 @@ static ssize_t dp_dsc_chunk_size_read(struct file *f, char __user *buf,
return result;
}
/* function: read DSC slice bpg offset on the connector
*
* The read function: dp_dsc_slice_bpg_offset_read
* returns dsc bpg slice offset set in the current configuration
* The value is calculated automatically by DSC code
* and depends on slice parameters and bpp target rate
* The return is an integer: 0 or other positive integer
* If 0 then DSC is disabled.
*
* Access it with the following command:
*
* cat /sys/kernel/debug/dri/0/DP-X/dsc_slice_bpg_offset
*
* 0 - means that DSC is disabled
*/
static ssize_t dp_dsc_slice_bpg_offset_read(struct file *f, char __user *buf,
size_t size, loff_t *pos)
{