On Wed, 11 Dec 2019, Manasi Navare <manasi.d.nav...@intel.com> wrote:
> On Wed, Dec 11, 2019 at 06:23:47PM +0200, Jani Nikula wrote:
>> The check for cpu_transcoder != TRANSCODER_A is more magic than
>> necessary, and potentially misleading. Before TGL, DSC is supported on
>> pipe A if, and only if, it's used with eDP or DSI transcoders. No
>> functional changes.
>>
>
> Hmm, so we could still use PIPE_A but if its eDP or DSI it would use
> TRANSCODER_EDP or TRANSCODER_DSI and that should still work?
Correct, because on gen 11 eDP/DSI have a DSC engine in front of the
transcoder.
> So its simpler to say that if it is PIPE_A && transcoder_A then it doesnt
> support DSC?
> Wouldnt it be simpler to change the condition to :
> if (INTEL_GEN(i915) >= 10 && !(pipe_A && transcode_A)
> return true;
The simplest is really the code as it is... but it's not clear, and
would deserve a comment. But I very much prefer self-documenting code
over comments explaining surprising code. So I'd like to spell out the
eDP/DSI transcoders here.
BR,
Jani.
>
> Regards
> Manasi
>
>> Cc: Manasi Navare <manasi.d.nav...@intel.com>
>> Cc: Vandita Kulkarni <vandita.kulka...@intel.com>
>> Signed-off-by: Jani Nikula <jani.nik...@intel.com>
>> ---
>> drivers/gpu/drm/i915/display/intel_vdsc.c | 8 +++++++-
>> 1 file changed, 7 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/gpu/drm/i915/display/intel_vdsc.c
>> b/drivers/gpu/drm/i915/display/intel_vdsc.c
>> index e6f60be9ee84..41718f721484 100644
>> --- a/drivers/gpu/drm/i915/display/intel_vdsc.c
>> +++ b/drivers/gpu/drm/i915/display/intel_vdsc.c
>> @@ -337,7 +337,10 @@ static const struct rc_parameters *get_rc_params(u16
>> compressed_bpp,
>> bool intel_dsc_source_support(struct intel_encoder *encoder,
>> const struct intel_crtc_state *crtc_state)
>> {
>> + const struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
>> struct drm_i915_private *i915 = to_i915(encoder->base.dev);
>> + enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
>> + enum pipe pipe = crtc->pipe;
>>
>> if (!INTEL_INFO(i915)->display.has_dsc)
>> return false;
>> @@ -347,7 +350,10 @@ bool intel_dsc_source_support(struct intel_encoder
>> *encoder,
>> return true;
>>
>> if (INTEL_GEN(i915) >= 10 &&
>> - crtc_state->cpu_transcoder != TRANSCODER_A)
>> + (pipe != PIPE_A ||
>> + (cpu_transcoder == TRANSCODER_EDP ||
>> + cpu_transcoder == TRANSCODER_DSI_0 ||
>> + cpu_transcoder == TRANSCODER_DSI_1)))
>> return true;
>>
>> return false;
>> --
>> 2.20.1
>>
--
Jani Nikula, Intel Open Source Graphics Center
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