Re: [RFC PATCH v2 02/13] drm/msm/dpu: take plane rotation into account for wide planes

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On 5/14/2023 10:01 AM, Dmitry Baryshkov wrote:
On Sat, 13 May 2023 at 01:12, Abhinav Kumar <quic_abhinavk@xxxxxxxxxxx> wrote:



On 3/20/2023 6:18 PM, Dmitry Baryshkov wrote:
Take into account the plane rotation and flipping when calculating src
positions for the wide plane parts.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>

Do we need to have a fixes tag for this? This means we dont consider
rotation while calculating src position today which is a bug?

Hmm, I thought that I had a check forbidding rotation with the current
approach, but I don't see it. Most probably I thought about it and
then forgot to add it.
The proper fix should be to disallow it for static SSPP case. I'll
include the patch into v3.


---
   drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c | 27 ++++++++++++++---------
   1 file changed, 17 insertions(+), 10 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c
index 2e63eb0a2f3f..d43e04fc4578 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c
@@ -887,16 +887,6 @@ static int dpu_plane_atomic_check(struct drm_plane *plane,
               return -EINVAL;
       }

-     pipe_cfg->src_rect = new_plane_state->src;
-
-     /* state->src is 16.16, src_rect is not */
-     pipe_cfg->src_rect.x1 >>= 16;
-     pipe_cfg->src_rect.x2 >>= 16;
-     pipe_cfg->src_rect.y1 >>= 16;
-     pipe_cfg->src_rect.y2 >>= 16;
-
-     pipe_cfg->dst_rect = new_plane_state->dst;
-
       fb_rect.x2 = new_plane_state->fb->width;
       fb_rect.y2 = new_plane_state->fb->height;

@@ -912,6 +902,15 @@ static int dpu_plane_atomic_check(struct drm_plane *plane,

       max_linewidth = pdpu->catalog->caps->max_linewidth;

+     /* state->src is 16.16, src_rect is not */
+     drm_rect_fp_to_int(&pipe_cfg->src_rect, &new_plane_state->src);
+
+     pipe_cfg->dst_rect = new_plane_state->dst;
+
+     drm_rect_rotate(&pipe_cfg->src_rect,
+                     new_plane_state->fb->width, new_plane_state->fb->height,
+                     new_plane_state->rotation);
+
       if (drm_rect_width(&pipe_cfg->src_rect) > max_linewidth) {
               /*
                * In parallel multirect case only the half of the usual width
@@ -959,6 +958,14 @@ static int dpu_plane_atomic_check(struct drm_plane *plane,
               r_pipe_cfg->dst_rect.x1 = pipe_cfg->dst_rect.x2;
       }

+     drm_rect_rotate_inv(&pipe_cfg->src_rect,
+                         new_plane_state->fb->width, new_plane_state->fb->height,
+                         new_plane_state->rotation);
+     if (r_pipe->sspp)

Dont you need to check for if (r_pipe_cfg) here and not if
(r_pipe->sspp) because parameter you are passing is the r_pipe_cfg to
drm_rect_rotate_inv().

Of course not. r_pipe_cfg is a pointer to the field in pstate. We know
that it can not be NULL.


Ack, and my bad for not checking that r_pipe_cfg points to a field in pstate but .... it was just weird though that you are checking for r_pipe->sspp before calling a method which really doesnt care if its null or not. How about you use drm_rect_visible(r_pipe_cfg->src_rect)

If its not set, it wont be visible too.


So we rotated the pipe_cfg once, then rotated_inv it to restore the
rectangle to its original state, but r_pipe_cfg's rectangle was never
rotated as it was not allocated before this function so it will remain
in inverse rotated state now right?

No. r_pipe_cfg is set beforehand to the half of the rotated pipe_cfg.


Ok i got it now. Instead of directly operating on the plane_state's rectangle which makes you to invert again why not just use a temporary drm_rect which stores the rotated pipe_cfg->src_rect. That way you dont have to invert anything?

+             drm_rect_rotate_inv(&r_pipe_cfg->src_rect,
+                                 new_plane_state->fb->width, new_plane_state->fb->height,
+                                 new_plane_state->rotation);
+
       ret = dpu_plane_atomic_check_pipe(pdpu, pipe, pipe_cfg, fmt);
       if (ret)
               return ret;



--
With best wishes
Dmitry



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