[Intel-gfx] [PATCH 2/2] drivers/drm/i915: Honor limits->max_bpp while computing DSC max input bpp

[Nautiyal, Ankit K]

On 8/24/2023 3:14 PM, Jani Nikula wrote:
> On Wed, 23 Aug 2023, Ankit Nautiyal <ankit.k.nautiyal at intel.com> wrote:
>> Edid specific BPC constraints are stored in limits->max_bpp. Honor these
>> limits while computing the input bpp for DSC.
>>
>> Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal at intel.com>
>> ---
>>   drivers/gpu/drm/i915/display/intel_dp.c | 4 +++-
>>   1 file changed, 3 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
>> index 5b48bfe09d0e..2a7f6cfe2832 100644
>> --- a/drivers/gpu/drm/i915/display/intel_dp.c
>> +++ b/drivers/gpu/drm/i915/display/intel_dp.c
>> @@ -2061,9 +2061,11 @@ static int intel_edp_dsc_compute_pipe_bpp(struct intel_dp *intel_dp,
>>   	if (forced_bpp) {
>>   		pipe_bpp = forced_bpp;
>>   	} else {
>> +		u8 max_bpc = limits->max_bpp / 3;
>> +
> 		int max_bpc = min_t(int, limits->max_bpp / 3, conn_state->max_requested_bpc);
>
>>   		/* For eDP use max bpp that can be supported with DSC. */
>>   		pipe_bpp = intel_dp_dsc_compute_max_bpp(intel_dp, max_bbc);
> Nitpick, IMO looks cleaner this way, as well as uses int instead of u8
> for computations.
>
> BR,
> Jani.

Thanks Jani for the comments, it does makes sense. Will fix in next 
version shortly.

Regards,

Ankit

>>   		if (!is_dsc_pipe_bpp_sufficient(i915, conn_state, limits, pipe_bpp)) {
>>   			drm_dbg_kms(&i915->drm,
>>   				    "Computed BPC is not in DSC BPC limits\n");