[Intel-gfx] [PATCH 01/11] HAX to make DSC work on the icelake test system

[Maarten Lankhorst]

Op 12-12-2019 om 01:27 schreef Manasi Navare:
> On Thu, Nov 14, 2019 at 05:05:12PM +0100, Maarten Lankhorst wrote:
>> DSC is available on the display emulator, but not set in DPCD.
>> Override the entries to allow bigjoiner testing.
> In general for these hacks for specific emulator, can we base it on certain i915 parameter like
> dsc_emaulator or something to override these values else we might actually affect DSC
> behaviour for the actual dsc panels.
>
>> Signed-off-by: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
>> ---
>>  drivers/gpu/drm/drm_dp_helper.c | 4 ++--
>>  include/drm/drm_dp_helper.h     | 1 +
>>  2 files changed, 3 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c
>> index 2c7870aef469..3d6038f35ea2 100644
>> --- a/drivers/gpu/drm/drm_dp_helper.c
>> +++ b/drivers/gpu/drm/drm_dp_helper.c
>> @@ -1261,7 +1261,7 @@ u8 drm_dp_dsc_sink_max_slice_count(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE],
>>  		if (slice_cap1 & DP_DSC_4_PER_DP_DSC_SINK)
>>  			return 4;
>>  		if (slice_cap1 & DP_DSC_2_PER_DP_DSC_SINK)
>> -			return 2;
>> +			return 4;
> Is this also needed for the big joiner since it doesnt return 4 slice count?
>
> Manasi
This patch is not for upstream, just a hack to make it work on the tgl with the emulator.