Re: [PATCH RFC v4 6/7] drm/msm/dpu: Allow NULL FBs in atomic commit

[Jessica Zhang]

On 6/30/2023 1:21 AM, Pekka Paalanen wrote:
On Fri, 30 Jun 2023 03:52:37 +0300
Dmitry Baryshkov <dmitry.barysh...@linaro.org> wrote:

On 30/06/2023 03:25, Jessica Zhang wrote:
Since solid fill planes allow for a NULL framebuffer in a valid commit,
add NULL framebuffer checks to atomic commit calls within DPU.

Signed-off-by: Jessica Zhang <quic_jessz...@quicinc.com>
---
   drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c  |  9 ++++++-
   drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c | 45 
+++++++++++++++++++------------
   2 files changed, 36 insertions(+), 18 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c 
b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
index 1edf2b6b0a26..d1b37d2cc202 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
@@ -451,6 +451,7 @@ static void _dpu_crtc_blend_setup_mixer(struct drm_crtc 
*crtc,
        struct drm_plane_state *state;
        struct dpu_crtc_state *cstate = to_dpu_crtc_state(crtc->state);
        struct dpu_plane_state *pstate = NULL;
+       const struct msm_format *fmt;
        struct dpu_format *format;
        struct dpu_hw_ctl *ctl = mixer->lm_ctl;
   
@@ -470,7 +471,13 @@ static void _dpu_crtc_blend_setup_mixer(struct drm_crtc *crtc,
                pstate = to_dpu_plane_state(state);
                fb = state->fb;
   
-		format = to_dpu_format(msm_framebuffer_format(pstate->base.fb));
+               if (state->pixel_source == DRM_PLANE_PIXEL_SOURCE_FB && fb)
+                       fmt = msm_framebuffer_format(pstate->base.fb);
+               else
+                       fmt = dpu_get_msm_format(&_dpu_crtc_get_kms(crtc)->base,
+                                       DRM_FORMAT_RGBA8888, 0);

The DRM_FORMAT_RGBA8888 should be defined somewhere in patch 1 as format
for the solid_fill, then that define can be used in this patch.

Isn't this just a driver-specific decision to convert a RGB323232
solid_fill to be presented as a RGBA8888?

Hi Dmitry and Pekka,

Yes, the ABGR8888 format is specific to msm/dpu. In earlier revisions of 
the series, we had come to an agreement that the solid fill property 
should take RGB323232 to match the similar Wayland single pixel buffer 
protocol [1].

[1] 
https://gitlab.freedesktop.org/wayland/wayland-protocols/-/merge_requests/104


Though, below there is ABGR8888 used for something... inconsistent?

Typo on my part. The format should be consistently ABGR8888.

Thanks,

Jessica Zhang



Thanks,
pq


+
+               format = to_dpu_format(fmt);
   
   		if (pstate->stage == DPU_STAGE_BASE && format->alpha_enable)
                        bg_alpha_enable = true;
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c 
b/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c
index 5f0984ce62b1..4476722f03bb 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c
@@ -837,8 +837,10 @@ static int dpu_plane_atomic_check(struct drm_plane *plane,
   
   	pipe_cfg->dst_rect = new_plane_state->dst;
   
-	fb_rect.x2 = new_plane_state->fb->width;
-       fb_rect.y2 = new_plane_state->fb->height;
+       if (new_plane_state->pixel_source == DRM_PLANE_PIXEL_SOURCE_FB && 
new_plane_state->fb) {
+               fb_rect.x2 = new_plane_state->fb->width;
+               fb_rect.y2 = new_plane_state->fb->height;
+       }
   
   	/* Ensure fb size is supported */
        if (drm_rect_width(&fb_rect) > MAX_IMG_WIDTH ||
@@ -848,10 +850,13 @@ static int dpu_plane_atomic_check(struct drm_plane *plane,
                return -E2BIG;
        }
   
-	fmt = to_dpu_format(msm_framebuffer_format(new_plane_state->fb));
-
        max_linewidth = pdpu->catalog->caps->max_linewidth;
   
+	if (drm_plane_solid_fill_enabled(new_plane_state))
+               fmt = dpu_get_dpu_format(DRM_FORMAT_ABGR8888);
+       else
+               fmt = 
to_dpu_format(msm_framebuffer_format(new_plane_state->fb));
+
        if (drm_rect_width(&pipe_cfg->src_rect) > max_linewidth) {
                /*
                 * In parallel multirect case only the half of the usual width
@@ -1082,21 +1087,32 @@ static void dpu_plane_sspp_atomic_update(struct 
drm_plane *plane)
        struct drm_crtc *crtc = state->crtc;
        struct drm_framebuffer *fb = state->fb;
        bool is_rt_pipe;
-       const struct dpu_format *fmt =
-               to_dpu_format(msm_framebuffer_format(fb));
+       const struct dpu_format *fmt;
        struct dpu_sw_pipe_cfg *pipe_cfg = &pstate->pipe_cfg;
        struct dpu_sw_pipe_cfg *r_pipe_cfg = &pstate->r_pipe_cfg;
        struct dpu_kms *kms = _dpu_plane_get_kms(&pdpu->base);
        struct msm_gem_address_space *aspace = kms->base.aspace;
        struct dpu_hw_fmt_layout layout;
        bool layout_valid = false;
-       int ret;
   
-	ret = dpu_format_populate_layout(aspace, fb, &layout);
-       if (ret)
-               DPU_ERROR_PLANE(pdpu, "failed to get format layout, %d\n", ret);
-       else
-               layout_valid = true;
+       if (state->pixel_source == DRM_PLANE_PIXEL_SOURCE_FB && fb) {
+               int ret;
+
+               fmt = to_dpu_format(msm_framebuffer_format(fb));
+
+               ret = dpu_format_populate_layout(aspace, fb, &layout);
+               if (ret)
+                       DPU_ERROR_PLANE(pdpu, "failed to get format layout, 
%d\n", ret);
+               else
+                       layout_valid = true;
+
+               DPU_DEBUG_PLANE(pdpu, "FB[%u] " DRM_RECT_FP_FMT "->crtc%u " 
DRM_RECT_FMT
+                               ", %4.4s ubwc %d\n", fb->base.id, 
DRM_RECT_FP_ARG(&state->src),
+                               crtc->base.id, DRM_RECT_ARG(&state->dst),
+                               (char *)&fmt->base.pixel_format, 
DPU_FORMAT_IS_UBWC(fmt));
+       } else {
+               fmt = dpu_get_dpu_format(DRM_FORMAT_ABGR8888);
+       }
   
   	pstate->pending = true;
   
@@ -1104,11 +1120,6 @@ static void dpu_plane_sspp_atomic_update(struct drm_plane *plane)
        pstate->needs_qos_remap |= (is_rt_pipe != pdpu->is_rt_pipe);
        pdpu->is_rt_pipe = is_rt_pipe;
   
-	DPU_DEBUG_PLANE(pdpu, "FB[%u] " DRM_RECT_FP_FMT "->crtc%u " DRM_RECT_FMT
-                       ", %4.4s ubwc %d\n", fb->base.id, 
DRM_RECT_FP_ARG(&state->src),
-                       crtc->base.id, DRM_RECT_ARG(&state->dst),
-                       (char *)&fmt->base.pixel_format, 
DPU_FORMAT_IS_UBWC(fmt));
-
        dpu_plane_sspp_update_pipe(plane, pipe, pipe_cfg, fmt,
                                   drm_mode_vrefresh(&crtc->mode),
                                   layout_valid ? &layout : NULL);