On Thu, 16 Jan 2025, Rodrigo Vivi <rodrigo.v...@intel.com> wrote:
> On Thu, Jan 16, 2025 at 03:24:16PM +0530, Ankit Nautiyal wrote:
>> While setting the bounds for compressed bpp we ensure that the
>> compressed bpp is less than the pipe bpp.
>>
>> This gives an issue with 420 output format where effective link bpp is
>> half that of the pipe bpp. Therefore instead of pipe bpp use link bpp to
>> set the bounds for the compressed bpp.
>>
>> Signed-off-by: Ankit Nautiyal <ankit.k.nauti...@intel.com>
>> ---
>> drivers/gpu/drm/i915/display/intel_dp.c | 10 ++++++++--
>
> patches to i915, even when they target only platforms supported by
> xe should also be sent to intel-gfx mainlinlist...
Agreed... but this one was? :)
BR,
Jani.
>
>> 1 file changed, 8 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/i915/display/intel_dp.c
>> b/drivers/gpu/drm/i915/display/intel_dp.c
>> index 1ad25c37f3c2..47fcfbcb893b 100644
>> --- a/drivers/gpu/drm/i915/display/intel_dp.c
>> +++ b/drivers/gpu/drm/i915/display/intel_dp.c
>> @@ -2068,9 +2068,12 @@ icl_dsc_compute_link_config(struct intel_dp *intel_dp,
>> int timeslots)
>> {
>> int i, ret;
>> + int link_bpp;
>> +
>> + link_bpp = intel_dp_output_bpp(pipe_config->output_format, pipe_bpp);
>>
>> /* Compressed BPP should be less than the Input DSC bpp */
>> - dsc_max_bpp = min(dsc_max_bpp, pipe_bpp - 1);
>> + dsc_max_bpp = min(dsc_max_bpp, link_bpp - 1);
>>
>> for (i = 0; i < ARRAY_SIZE(valid_dsc_bpp); i++) {
>> if (valid_dsc_bpp[i] < dsc_min_bpp)
>> @@ -2113,6 +2116,7 @@ xelpd_dsc_compute_link_config(struct intel_dp
>> *intel_dp,
>> u8 bppx16_incr = drm_dp_dsc_sink_bpp_incr(connector->dp.dsc_dpcd);
>> u16 compressed_bppx16;
>> u8 bppx16_step;
>> + int link_bpp;
>> int ret;
>>
>> if (DISPLAY_VER(display) < 14 || bppx16_incr <= 1)
>> @@ -2120,8 +2124,10 @@ xelpd_dsc_compute_link_config(struct intel_dp
>> *intel_dp,
>> else
>> bppx16_step = 16 / bppx16_incr;
>>
>> + link_bpp = intel_dp_output_bpp(pipe_config->output_format, pipe_bpp);
>> +
>> /* Compressed BPP should be less than the Input DSC bpp */
>> - dsc_max_bpp = min(dsc_max_bpp << 4, (pipe_bpp << 4) - bppx16_step);
>> + dsc_max_bpp = min(dsc_max_bpp << 4, (link_bpp << 4) - bppx16_step);
>> dsc_min_bpp = dsc_min_bpp << 4;
>>
>> for (compressed_bppx16 = dsc_max_bpp;
>> --
>> 2.45.2
>>
--
Jani Nikula, Intel
