[PATCH 5.11 101/254] drm/i915/dsc: fix DSS CTL register usage for ICL DSI transcoders

[Greg Kroah-Hartman]

From: Jani Nikula <jani.nikula@xxxxxxxxx>

commit b61fde1beb6b1847f1743e75f4d9839acebad76a upstream.

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")
Cc: Manasi Navare <manasi.d.navare@xxxxxxxxx>
Cc: Animesh Manna <animesh.manna@xxxxxxxxx>
Cc: Vandita Kulkarni <vandita.kulkarni@xxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> # v5.11+
Reviewed-by: Manasi Navare <manasi.d.navare@xxxxxxxxx>
Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20210319115333.8330-1-jani.nikula@xxxxxxxxx
(cherry picked from commit 5706d02871240fdba7ddd6ab1cc31672fc95a90f)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/gpu/drm/i915/display/intel_vdsc.c |   10 ++--------
 1 file changed, 2 insertions(+), 8 deletions(-)

--- a/drivers/gpu/drm/i915/display/intel_vdsc.c
+++ b/drivers/gpu/drm/i915/display/intel_vdsc.c
@@ -1016,20 +1016,14 @@ static i915_reg_t dss_ctl1_reg(const str
 {
 	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;
 }
 
 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,