drm/msm/mdp5: Add optional 'right' Layer Mixer in CRTC state

Add another mdp5_hw_mixer pointer (r_mixer) in mdp5_crtc_state.
This mixer will be used to generate the right half of the scanout.

With Source Split, a SSPP can now be connected to 2 Layer Mixers, but
has to be at the same blend level (stage #) on both Layer Mixers.

A drm_plane that has a lesser width than the max width supported, will
comprise of a single SSPP/hwpipe, staged on both the Layer Mixers at
the same blend level. A plane that is greater than max width will comprise
of 2 SSPPs, with the 'left' SSPP staged on the left LM, and the 'right'
SSPP staged on the right LM at the same blend level.

For now, the drm_plane consists of only one SSPP, therefore, it
needs to be staged on both the LMs in blend_setup() and mdp5_ctl_blend().
We'll extend this logic to support 2 hwpipes per plane later.

The crtc cursor ops (using the LM cursors, not SSPP cursors) simply
return an error if they're called when the right mixer is assigned to
the CRTC state. With source split is enabled, we're expected to only
SSPP cursors.

This commit adds code that configures the right mixer, but the r_mixer
itself isn't assigned at the moment.

Signed-off-by: Archit Taneja <architt@codeaurora.org>
Signed-off-by: Rob Clark <robdclark@gmail.com>

1 files changed, 5 insertions, 2 deletions

diff --git a/drivers/gpu/drm/msm/mdp/mdp5/mdp5_ctl.h b/drivers/gpu/drm/msm/mdp/mdp5/mdp5_ctl.h
index 751dd861cfd8..b63120388dc6 100644
--- a/drivers/gpu/drm/msm/mdp/mdp5/mdp5_ctl.h
+++ b/drivers/gpu/drm/msm/mdp/mdp5/mdp5_ctl.h
@@ -46,6 +46,8 @@ int mdp5_ctl_set_cursor(struct mdp5_ctl *ctl, struct mdp5_pipeline *pipeline,
 			int cursor_id, bool enable);
 int mdp5_ctl_pair(struct mdp5_ctl *ctlx, struct mdp5_ctl *ctly, bool enable);
 
+#define MAX_PIPE_STAGE		2
+
 /*
  * mdp5_ctl_blend() - Blend multiple layers on a Layer Mixer (LM)
  *
@@ -59,8 +61,9 @@ int mdp5_ctl_pair(struct mdp5_ctl *ctlx, struct mdp5_ctl *ctly, bool enable);
  */
 #define MDP5_CTL_BLEND_OP_FLAG_BORDER_OUT	BIT(0)
 int mdp5_ctl_blend(struct mdp5_ctl *ctl, struct mdp5_pipeline *pipeline,
-		   enum mdp5_pipe *stage, u32 stage_cnt,
-		   u32 ctl_blend_op_flags);
+		   enum mdp5_pipe stage[][MAX_PIPE_STAGE],
+		   enum mdp5_pipe r_stage[][MAX_PIPE_STAGE],
+		   u32 stage_cnt, u32 ctl_blend_op_flags);
 
 /**
  * mdp_ctl_flush_mask...() - Register FLUSH masks