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Message-Id: <20241025-dpu-virtual-wide-v6-8-0310fd519765@linaro.org>
Date: Fri, 25 Oct 2024 03:20:15 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Rob Clark <robdclark@...il.com>, 
 Abhinav Kumar <quic_abhinavk@...cinc.com>, Sean Paul <sean@...rly.run>, 
 Marijn Suijten <marijn.suijten@...ainline.org>, 
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>
Cc: linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org, 
 freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: [PATCH v6 8/9] drm/msm/dpu: allow using two SSPP blocks for a
 single plane

Virtual wide planes give high amount of flexibility, but it is not
always enough:

In parallel multirect case only the half of the usual width is supported
for tiled formats. Thus the whole width of two tiled multirect
rectangles can not be greater than max_linewidth, which is not enough
for some platforms/compositors.

Another example is as simple as wide YUV plane. YUV planes can not use
multirect, so currently they are limited to max_linewidth too.

Now that the planes are fully virtualized, add support for allocating
two SSPP blocks to drive a single DRM plane. This fixes both mentioned
cases and allows all planes to go up to 2*max_linewidth (at the cost of
making some of the planes unavailable to the user).

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c | 163 ++++++++++++++++++++++--------
 1 file changed, 119 insertions(+), 44 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c
index 125db3803cf5..ad6cc469f475 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c
@@ -20,7 +20,6 @@
 #include "msm_drv.h"
 #include "msm_mdss.h"
 #include "dpu_kms.h"
-#include "dpu_formats.h"
 #include "dpu_hw_sspp.h"
 #include "dpu_hw_util.h"
 #include "dpu_trace.h"
@@ -888,6 +887,28 @@ static int dpu_plane_atomic_check_nosspp(struct drm_plane *plane,
 	return 0;
 }
 
+static int dpu_plane_is_multirect_parallel_capable(struct dpu_sw_pipe *pipe,
+						   struct dpu_sw_pipe_cfg *pipe_cfg,
+						   const struct msm_format *fmt,
+						   uint32_t max_linewidth)
+{
+	if (drm_rect_width(&pipe_cfg->src_rect) != drm_rect_width(&pipe_cfg->dst_rect) ||
+	    drm_rect_height(&pipe_cfg->src_rect) != drm_rect_height(&pipe_cfg->dst_rect))
+		return false;
+
+	if (pipe_cfg->rotation & DRM_MODE_ROTATE_90)
+		return false;
+
+	if (MSM_FORMAT_IS_YUV(fmt))
+		return false;
+
+	if (MSM_FORMAT_IS_UBWC(fmt) &&
+	    drm_rect_width(&pipe_cfg->src_rect) > max_linewidth / 2)
+		return false;
+
+	return true;
+}
+
 static int dpu_plane_atomic_check_sspp(struct drm_plane *plane,
 				       struct drm_atomic_state *state,
 				       const struct drm_crtc_state *crtc_state)
@@ -901,7 +922,6 @@ static int dpu_plane_atomic_check_sspp(struct drm_plane *plane,
 	const struct msm_format *fmt;
 	struct dpu_sw_pipe_cfg *pipe_cfg = &pstate->pipe_cfg;
 	struct dpu_sw_pipe_cfg *r_pipe_cfg = &pstate->r_pipe_cfg;
-	uint32_t max_linewidth;
 	uint32_t supported_rotations;
 	const struct dpu_sspp_cfg *pipe_hw_caps;
 	const struct dpu_sspp_sub_blks *sblk;
@@ -923,8 +943,6 @@ static int dpu_plane_atomic_check_sspp(struct drm_plane *plane,
 
 	fmt = msm_framebuffer_format(new_plane_state->fb);
 
-	max_linewidth = pdpu->catalog->caps->max_linewidth;
-
 	supported_rotations = DRM_MODE_REFLECT_MASK | DRM_MODE_ROTATE_0;
 
 	if (pipe_hw_caps->features & BIT(DPU_SSPP_INLINE_ROTATION))
@@ -940,41 +958,6 @@ static int dpu_plane_atomic_check_sspp(struct drm_plane *plane,
 		return ret;
 
 	if (drm_rect_width(&r_pipe_cfg->src_rect) != 0) {
-		/*
-		 * In parallel multirect case only the half of the usual width
-		 * is supported for tiled formats. If we are here, we know that
-		 * full width is more than max_linewidth, thus each rect is
-		 * wider than allowed.
-		 */
-		if (MSM_FORMAT_IS_UBWC(fmt) &&
-		    drm_rect_width(&pipe_cfg->src_rect) > max_linewidth) {
-			DPU_DEBUG_PLANE(pdpu, "invalid src " DRM_RECT_FMT " line:%u, tiled format\n",
-					DRM_RECT_ARG(&pipe_cfg->src_rect), max_linewidth);
-			return -E2BIG;
-		}
-
-		if (drm_rect_width(&pipe_cfg->src_rect) != drm_rect_width(&pipe_cfg->dst_rect) ||
-		    drm_rect_height(&pipe_cfg->src_rect) != drm_rect_height(&pipe_cfg->dst_rect) ||
-		    (!test_bit(DPU_SSPP_SMART_DMA_V1, &pipe->sspp->cap->features) &&
-		     !test_bit(DPU_SSPP_SMART_DMA_V2, &pipe->sspp->cap->features)) ||
-		    pipe_cfg->rotation & DRM_MODE_ROTATE_90 ||
-		    MSM_FORMAT_IS_YUV(fmt)) {
-			DPU_DEBUG_PLANE(pdpu, "invalid src " DRM_RECT_FMT " line:%u, can't use split source\n",
-					DRM_RECT_ARG(&pipe_cfg->src_rect), max_linewidth);
-			return -E2BIG;
-		}
-
-		/*
-		 * Use multirect for wide plane. We do not support dynamic
-		 * assignment of SSPPs, so we know the configuration.
-		 */
-		pipe->multirect_index = DPU_SSPP_RECT_0;
-		pipe->multirect_mode = DPU_SSPP_MULTIRECT_PARALLEL;
-
-		r_pipe->sspp = pipe->sspp;
-		r_pipe->multirect_index = DPU_SSPP_RECT_1;
-		r_pipe->multirect_mode = DPU_SSPP_MULTIRECT_PARALLEL;
-
 		ret = dpu_plane_atomic_check_pipe(pdpu, r_pipe, r_pipe_cfg, fmt,
 						  &crtc_state->adjusted_mode);
 		if (ret)
@@ -995,16 +978,16 @@ static int dpu_plane_atomic_check(struct drm_plane *plane,
 	struct dpu_kms *dpu_kms = _dpu_plane_get_kms(plane);
 	struct dpu_sw_pipe *pipe = &pstate->pipe;
 	struct dpu_sw_pipe *r_pipe = &pstate->r_pipe;
+	struct dpu_sw_pipe_cfg *pipe_cfg = &pstate->pipe_cfg;
+	struct dpu_sw_pipe_cfg *r_pipe_cfg = &pstate->r_pipe_cfg;
 	const struct drm_crtc_state *crtc_state = NULL;
 
 	if (new_plane_state->crtc)
 		crtc_state = drm_atomic_get_new_crtc_state(state,
 							   new_plane_state->crtc);
 
-	if (pdpu->pipe != SSPP_NONE) {
-		pipe->sspp = dpu_rm_get_sspp(&dpu_kms->rm, pdpu->pipe);
-		r_pipe->sspp = NULL;
-	}
+	pipe->sspp = dpu_rm_get_sspp(&dpu_kms->rm, pdpu->pipe);
+	r_pipe->sspp = NULL;
 
 	if (!pipe->sspp)
 		return -EINVAL;
@@ -1021,6 +1004,49 @@ static int dpu_plane_atomic_check(struct drm_plane *plane,
 	r_pipe->multirect_index = DPU_SSPP_RECT_SOLO;
 	r_pipe->multirect_mode = DPU_SSPP_MULTIRECT_NONE;
 
+	if (drm_rect_width(&r_pipe_cfg->src_rect) != 0) {
+		uint32_t max_linewidth = dpu_kms->catalog->caps->max_linewidth;
+		const struct msm_format *fmt;
+
+		fmt = msm_framebuffer_format(new_plane_state->fb);
+
+		/*
+		 * In parallel multirect case only the half of the usual width
+		 * is supported for tiled formats. If we are here, we know that
+		 * full width is more than max_linewidth, thus each rect is
+		 * wider than allowed.
+		 */
+		if (MSM_FORMAT_IS_UBWC(fmt) &&
+		    drm_rect_width(&pipe_cfg->src_rect) > max_linewidth) {
+			DPU_DEBUG_PLANE(pdpu, "invalid src " DRM_RECT_FMT " line:%u, tiled format\n",
+					DRM_RECT_ARG(&pipe_cfg->src_rect), max_linewidth);
+			return -E2BIG;
+		}
+
+		if (drm_rect_width(&pipe_cfg->src_rect) != drm_rect_width(&pipe_cfg->dst_rect) ||
+		    drm_rect_height(&pipe_cfg->src_rect) != drm_rect_height(&pipe_cfg->dst_rect) ||
+		    (!test_bit(DPU_SSPP_SMART_DMA_V1, &pipe->sspp->cap->features) &&
+		     !test_bit(DPU_SSPP_SMART_DMA_V2, &pipe->sspp->cap->features)) ||
+		    pipe_cfg->rotation & DRM_MODE_ROTATE_90 ||
+		    MSM_FORMAT_IS_YUV(fmt)) {
+			DPU_DEBUG_PLANE(pdpu, "invalid src " DRM_RECT_FMT " line:%u, can't use split source\n",
+					DRM_RECT_ARG(&pipe_cfg->src_rect), max_linewidth);
+			return -E2BIG;
+		}
+
+		/*
+		 * Use multirect for wide plane. We do not support dynamic
+		 * assignment of SSPPs, so we know the configuration.
+		 */
+		r_pipe->sspp = pipe->sspp;
+
+		pipe->multirect_index = DPU_SSPP_RECT_0;
+		pipe->multirect_mode = DPU_SSPP_MULTIRECT_PARALLEL;
+
+		r_pipe->multirect_index = DPU_SSPP_RECT_1;
+		r_pipe->multirect_mode = DPU_SSPP_MULTIRECT_PARALLEL;
+	}
+
 	return dpu_plane_atomic_check_sspp(plane, state, crtc_state);
 }
 
@@ -1054,8 +1080,16 @@ static int dpu_plane_virtual_atomic_check(struct drm_plane *plane,
 		return 0;
 	}
 
-	/* force resource reallocation if the format of FB has changed */
+	/*
+	 * Force resource reallocation if the format of FB or src/dst have
+	 * changed. We might need to allocate different SSPP or SSPPs for this
+	 * plane than the one used previously.
+	 */
 	if (!old_plane_state || !old_plane_state->fb ||
+	    old_plane_state->src_w != plane_state->src_w ||
+	    old_plane_state->src_h != plane_state->src_h ||
+	    old_plane_state->src_w != plane_state->src_w ||
+	    old_plane_state->crtc_h != plane_state->crtc_h ||
 	    msm_framebuffer_format(old_plane_state->fb) !=
 	    msm_framebuffer_format(plane_state->fb))
 		crtc_state->planes_changed = true;
@@ -1075,7 +1109,10 @@ static int dpu_plane_virtual_assign_resources(struct drm_crtc *crtc,
 	struct dpu_plane_state *pstate;
 	struct dpu_sw_pipe *pipe;
 	struct dpu_sw_pipe *r_pipe;
+	struct dpu_sw_pipe_cfg *pipe_cfg;
+	struct dpu_sw_pipe_cfg *r_pipe_cfg;
 	const struct msm_format *fmt;
+	uint32_t max_linewidth;
 
 	if (plane_state->crtc)
 		crtc_state = drm_atomic_get_new_crtc_state(state,
@@ -1084,6 +1121,8 @@ static int dpu_plane_virtual_assign_resources(struct drm_crtc *crtc,
 	pstate = to_dpu_plane_state(plane_state);
 	pipe = &pstate->pipe;
 	r_pipe = &pstate->r_pipe;
+	pipe_cfg = &pstate->pipe_cfg;
+	r_pipe_cfg = &pstate->r_pipe_cfg;
 
 	pipe->sspp = NULL;
 	r_pipe->sspp = NULL;
@@ -1098,10 +1137,46 @@ static int dpu_plane_virtual_assign_resources(struct drm_crtc *crtc,
 
 	reqs.rot90 = drm_rotation_90_or_270(plane_state->rotation);
 
+	max_linewidth = dpu_kms->catalog->caps->max_linewidth;
+
 	pipe->sspp = dpu_rm_reserve_sspp(&dpu_kms->rm, global_state, crtc, &reqs);
 	if (!pipe->sspp)
 		return -ENODEV;
 
+	if (drm_rect_width(&r_pipe_cfg->src_rect) == 0) {
+		pipe->multirect_index = DPU_SSPP_RECT_SOLO;
+		pipe->multirect_mode = DPU_SSPP_MULTIRECT_NONE;
+
+		r_pipe->multirect_index = DPU_SSPP_RECT_SOLO;
+		r_pipe->multirect_mode = DPU_SSPP_MULTIRECT_NONE;
+
+		r_pipe->sspp = NULL;
+	} else {
+		if (dpu_plane_is_multirect_parallel_capable(pipe, pipe_cfg, fmt, max_linewidth) &&
+		    dpu_plane_is_multirect_parallel_capable(r_pipe, r_pipe_cfg, fmt, max_linewidth) &&
+		    (test_bit(DPU_SSPP_SMART_DMA_V1, &pipe->sspp->cap->features) ||
+		     test_bit(DPU_SSPP_SMART_DMA_V2, &pipe->sspp->cap->features))) {
+			r_pipe->sspp = pipe->sspp;
+
+			pipe->multirect_index = DPU_SSPP_RECT_0;
+			pipe->multirect_mode = DPU_SSPP_MULTIRECT_PARALLEL;
+
+			r_pipe->multirect_index = DPU_SSPP_RECT_1;
+			r_pipe->multirect_mode = DPU_SSPP_MULTIRECT_PARALLEL;
+		} else {
+			/* multirect is not possible, use two SSPP blocks */
+			r_pipe->sspp = dpu_rm_reserve_sspp(&dpu_kms->rm, global_state, crtc, &reqs);
+			if (!r_pipe->sspp)
+				return -ENODEV;
+
+			pipe->multirect_index = DPU_SSPP_RECT_SOLO;
+			pipe->multirect_mode = DPU_SSPP_MULTIRECT_NONE;
+
+			r_pipe->multirect_index = DPU_SSPP_RECT_SOLO;
+			r_pipe->multirect_mode = DPU_SSPP_MULTIRECT_NONE;
+		}
+	}
+
 	return dpu_plane_atomic_check_sspp(plane, state, crtc_state);
 }
 

-- 
2.39.5


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