On Fri, Mar 19, 2021 at 01:53:33PM +0200, Jani Nikula wrote:
> Use the correct DSS CTL registers for ICL DSI transcoders.
>
> As a side effect, this also brings back the sanity check for trying to
> use pipe DSC registers on pipe A on ICL.
>
> Fixes: 8a029c113b17 ("drm/i915/dp: Modify VDSC helpers to configure DSC for Bigjoiner slave")
> References: http://lore.kernel.org/r/87eegxq2lq.fsf@xxxxxxxxx
Thanks Jani for the detailed review comments here and explanation on what
broke the DSI DSC on < Gen 12 platforms.
> Cc: Manasi Navare <manasi.d.navare@xxxxxxxxx>
> Cc: Animesh Manna <animesh.manna@xxxxxxxxx>
> Cc: Vandita Kulkarni <vandita.kulkarni@xxxxxxxxx>
> Cc: <stable@xxxxxxxxxxxxxxx> # v5.11+
> Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx>
>
> ---
>
> Untested, I don't have the platform.
> ---
> drivers/gpu/drm/i915/display/intel_vdsc.c | 10 ++--------
> 1 file changed, 2 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_vdsc.c b/drivers/gpu/drm/i915/display/intel_vdsc.c
> index f58cc5700784..a86c57d117f2 100644
> --- a/drivers/gpu/drm/i915/display/intel_vdsc.c
> +++ b/drivers/gpu/drm/i915/display/intel_vdsc.c
> @@ -1014,20 +1014,14 @@ static i915_reg_t dss_ctl1_reg(const struct intel_crtc_state *crtc_state)
> {
> enum pipe pipe = to_intel_crtc(crtc_state->uapi.crtc)->pipe;
>
> - if (crtc_state->cpu_transcoder == TRANSCODER_EDP)
> - return DSS_CTL1;
> -
> - return ICL_PIPE_DSS_CTL1(pipe);
> + return is_pipe_dsc(crtc_state) ? ICL_PIPE_DSS_CTL1(pipe) : DSS_CTL1;
Yes using is_pipe_dsc() makes sense here in order to select proper DSS_CTL regs
for DSI.
Reviewed-by: Manasi Navare <manasi.d.navare@xxxxxxxxx>
Manasi
> }
>
> static i915_reg_t dss_ctl2_reg(const struct intel_crtc_state *crtc_state)
> {
> enum pipe pipe = to_intel_crtc(crtc_state->uapi.crtc)->pipe;
>
> - if (crtc_state->cpu_transcoder == TRANSCODER_EDP)
> - return DSS_CTL2;
> -
> - return ICL_PIPE_DSS_CTL2(pipe);
> + return is_pipe_dsc(crtc_state) ? ICL_PIPE_DSS_CTL2(pipe) : DSS_CTL2;
> }
>
> void intel_dsc_enable(struct intel_encoder *encoder,
> --
> 2.20.1
>
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