On 2019-10-22 9:33 a.m., Li, Roman wrote:
>> Any reason why we're skipping a flag here going from 0x2 to 0x8?
>
> 0x4 is reserved for fractional pwm mask:
> https://patchwork.freedesktop.org/patch/336923/
Ah, missed that patch. No problem then, feel free to go ahead with this.
Nicholas Kazlauskas
>
> Thank you Nicholas for the review.
>
> -----Original Message-----
> From: Kazlauskas, Nicholas <nicholas.kazlaus...@amd.com>
> Sent: Tuesday, October 22, 2019 8:39 AM
> To: Li, Roman <roman...@amd.com>; amd-gfx@lists.freedesktop.org; Deucher,
> Alexander <alexander.deuc...@amd.com>
> Cc: Wentland, Harry <harry.wentl...@amd.com>; Lakha, Bhawanpreet
> <bhawanpreet.la...@amd.com>; Li, Sun peng (Leo) <sunpeng...@amd.com>
> Subject: Re: [PATCH] drm/amdgpu/display: add dc feature mask for psr
> enablement
>
> On 2019-10-21 5:45 p.m., roman...@amd.com wrote:
>> From: Roman Li <roman...@amd.com>
>>
>> [Why]
>> Adding psr mask to dc features allows selectively disable/enable psr.
>> Current psr implementation may not work with non-pageflipping application.
>> Until resolved it should be disabled by default.
>>
>> [How]
>> Add dcfeaturemask for psr enablement. Disable by default.
>> To enable set amdgpu.dcfeaturemask=0x8 in grub kernel command line.
>>
>> Signed-off-by: Roman Li <roman...@amd.com>
>> ---
>> drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 3 ++-
>> drivers/gpu/drm/amd/include/amd_shared.h | 1 +
>> 2 files changed, 3 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
>> b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
>> index 1cf4beb..0f08879 100644
>> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
>> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
>> @@ -2424,7 +2424,8 @@ static int amdgpu_dm_initialize_drm_device(struct
>> amdgpu_device *adev)
>> } else if (dc_link_detect(link, DETECT_REASON_BOOT)) {
>> amdgpu_dm_update_connector_after_detect(aconnector);
>> register_backlight_device(dm, link);
>> - amdgpu_dm_set_psr_caps(link);
>> + if (amdgpu_dc_feature_mask & DC_PSR_MASK)
>> + amdgpu_dm_set_psr_caps(link);
>> }
>>
>>
>> diff --git a/drivers/gpu/drm/amd/include/amd_shared.h
>> b/drivers/gpu/drm/amd/include/amd_shared.h
>> index 8889aac..1daa221 100644
>> --- a/drivers/gpu/drm/amd/include/amd_shared.h
>> +++ b/drivers/gpu/drm/amd/include/amd_shared.h
>> @@ -143,6 +143,7 @@ enum PP_FEATURE_MASK {
>> enum DC_FEATURE_MASK {
>> DC_FBC_MASK = 0x1,
>> DC_MULTI_MON_PP_MCLK_SWITCH_MASK = 0x2,
>> + DC_PSR_MASK = 0x8,
>
> Can this just be 0x4 instead? Any reason why we're skipping a flag here going
> from 0x2 to 0x8?
>
> You can still have my:
>
> Reviewed-by: Nicholas Kazlauskas <nicholas.kazlaus...@amd.com>
>
> but my preference would be on fixing this up to a 0x4 first in the commit
> message / DC_FEATURE_MASK.
>
> Nicholas Kazlauskas
>
>> };
>>
>> enum amd_dpm_forced_level;
>>
>
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