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

Jessica Zhang
2023-06-30T00:26:18Z

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_jesszhan@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);
+
+ 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);

--
2.41.0