linux-kernel - [PATCH RFC v7 08/10] drm/msm/dpu: Allow NULL FBs in atomic commit

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Message-ID: <20231027-solid-fill-v7-8-780188bfa7b2@quicinc.com>
Date:   Fri, 27 Oct 2023 15:32:58 -0700
From:   Jessica Zhang <quic_jesszhan@...cinc.com>
To:     Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Rob Clark <robdclark@...il.com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        "Sean Paul" <sean@...rly.run>,
        Marijn Suijten <marijn.suijten@...ainline.org>
CC:     <quic_abhinavk@...cinc.com>, <ppaalanen@...il.com>,
        <contact@...rsion.fr>, <laurent.pinchart@...asonboard.com>,
        <sebastian.wick@...hat.com>, <ville.syrjala@...ux.intel.com>,
        <dri-devel@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-msm@...r.kernel.org>, <freedreno@...ts.freedesktop.org>,
        <wayland-devel@...ts.freedesktop.org>,
        Jessica Zhang <quic_jesszhan@...cinc.com>
Subject: [PATCH RFC v7 08/10] drm/msm/dpu: Allow NULL FBs in atomic commit

Since solid fill planes allow for a NULL framebuffer in a valid commit,
add NULL framebuffer checks to atomic commit calls within DPU.

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Signed-off-by: Jessica Zhang <quic_jesszhan@...cinc.com>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c  |  9 +++++++-
 drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c | 35 ++++++++++++++++++++-----------
 2 files changed, 31 insertions(+), 13 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
index 3c475f8042b0..3b9648c679ad 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 (drm_plane_solid_fill_enabled(state))
+			fmt = dpu_get_msm_format(&_dpu_crtc_get_kms(crtc)->base,
+					DRM_FORMAT_ABGR8888, 0);
+		else
+			fmt = msm_framebuffer_format(pstate->base.fb);
+
+		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 3eef5e025e12..9615653db787 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c
@@ -55,6 +55,8 @@
 
 #define DEFAULT_REFRESH_RATE	60
 
+#define DPU_SOLID_FILL_FORMAT	DRM_FORMAT_ABGR8888
+
 static const uint32_t qcom_compressed_supported_formats[] = {
 	DRM_FORMAT_ABGR8888,
 	DRM_FORMAT_ARGB8888,
@@ -658,7 +660,7 @@ static void _dpu_plane_color_fill(struct dpu_plane *pdpu,
 	 * select fill format to match user property expectation,
 	 * h/w only supports RGB variants
 	 */
-	fmt = dpu_get_dpu_format(DRM_FORMAT_ABGR8888);
+	fmt = dpu_get_dpu_format(DPU_SOLID_FILL_FORMAT);
 	/* should not happen ever */
 	if (!fmt)
 		return;
@@ -877,18 +879,23 @@ 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 ||
-	    drm_rect_height(&fb_rect) > MAX_IMG_HEIGHT) {
-		DPU_DEBUG_PLANE(pdpu, "invalid framebuffer " DRM_RECT_FMT "\n",
-				DRM_RECT_ARG(&fb_rect));
-		return -E2BIG;
+		/* Ensure fb size is supported */
+		if (drm_rect_width(&fb_rect) > MAX_IMG_WIDTH ||
+		    drm_rect_height(&fb_rect) > MAX_IMG_HEIGHT) {
+			DPU_DEBUG_PLANE(pdpu, "invalid framebuffer " DRM_RECT_FMT "\n",
+					DRM_RECT_ARG(&fb_rect));
+			return -E2BIG;
+		}
 	}
 
-	fmt = to_dpu_format(msm_framebuffer_format(new_plane_state->fb));
+	if (drm_plane_solid_fill_enabled(new_plane_state))
+		fmt = dpu_get_dpu_format(DPU_SOLID_FILL_FORMAT);
+	else
+		fmt = to_dpu_format(msm_framebuffer_format(new_plane_state->fb));
 
 	max_linewidth = pdpu->catalog->caps->max_linewidth;
 
@@ -1123,8 +1130,7 @@ 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);
@@ -1133,6 +1139,11 @@ static void dpu_plane_sspp_atomic_update(struct drm_plane *plane)
 	bool layout_valid = false;
 	int ret;
 
+	if (drm_plane_solid_fill_enabled(state))
+		return;
+
+	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);

-- 
2.42.0