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From:   Liviu Dudau <Liviu.Dudau@arm.com>
To:     Ayan Kumar Halder <ayan.halder@arm.com>
Cc:     Brian Starkey <brian.starkey@arm.com>,
        Mali DP Maintainers <malidp@foss.arm.com>,
        dri-devel@lists.freedesktop.org,
        LKML <linux-kernel@vger.kernel.org>,
        Liviu Dudau <liviu.dudau@arm.com>
Subject: [PATCH v2] drm/arm/malidp: Validate rotations for compressed/uncompressed framebuffers for each layer
Date:   Fri, 21 Sep 2018 15:33:53 +0100
Message-Id: <20180921143353.15943-1-Liviu.Dudau@arm.com>
In-Reply-To: <20180615124654.GD15072@e110455-lin.cambridge.arm.com>
References: <20180615124654.GD15072@e110455-lin.cambridge.arm.com>
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From: Ayan Kumar Halder <ayan.halder@arm.com>

Add support for compressed framebuffers that are described using
the framebuffer's modifier field. Mali DP uses the rotation memory for
the decompressor of the format, so we need to check for space when
the modifiers are present.

Signed-off-by: Ayan Kumar Halder <ayan.halder@arm.com>
Reviewed-by: Brian Starkey <brian.starkey@arm.com>
[re-worded commit, rebased, cleaned up duplicated checks for
 RGB888 and BGR888 and removed additional parameter for
 rotmem_required function hook]
Signed-off-by: Liviu Dudau <liviu.dudau@arm.com>
---
 drivers/gpu/drm/arm/malidp_crtc.c   | 28 ++++++++++++---------
 drivers/gpu/drm/arm/malidp_hw.c     | 38 ++++++++++++-----------------
 drivers/gpu/drm/arm/malidp_hw.h     |  7 ++++++
 drivers/gpu/drm/arm/malidp_planes.c | 19 +++++++++++----
 4 files changed, 53 insertions(+), 39 deletions(-)

diff --git a/drivers/gpu/drm/arm/malidp_crtc.c b/drivers/gpu/drm/arm/malidp_crtc.c
index ef44202fb43f8..e1b72782848c3 100644
--- a/drivers/gpu/drm/arm/malidp_crtc.c
+++ b/drivers/gpu/drm/arm/malidp_crtc.c
@@ -348,19 +348,20 @@ static int malidp_crtc_atomic_check(struct drm_crtc *crtc,
 
 	/*
 	 * check if there is enough rotation memory available for planes
-	 * that need 90° and 270° rotation. Each plane has set its required
-	 * memory size in the ->plane_check() callback, here we only make
-	 * sure that the sums are less that the total usable memory.
+	 * that need 90° and 270° rotion or planes that are compressed.
+	 * Each plane has set its required memory size in the ->plane_check()
+	 * callback, here we only make sure that the sums are less that the
+	 * total usable memory.
 	 *
 	 * The rotation memory allocation algorithm (for each plane):
-	 *  a. If no more rotated planes exist, all remaining rotate
-	 *     memory in the bank is available for use by the plane.
-	 *  b. If other rotated planes exist, and plane's layer ID is
-	 *     DE_VIDEO1, it can use all the memory from first bank if
-	 *     secondary rotation memory bank is available, otherwise it can
+	 *  a. If no more rotated or compressed planes exist, all remaining
+	 *     rotate memory in the bank is available for use by the plane.
+	 *  b. If other rotated or compressed planes exist, and plane's
+	 *     layer ID is DE_VIDEO1, it can use all the memory from first bank
+	 *     if secondary rotation memory bank is available, otherwise it can
 	 *     use up to half the bank's memory.
-	 *  c. If other rotated planes exist, and plane's layer ID is not
-	 *     DE_VIDEO1, it can use half of the available memory
+	 *  c. If other rotated or compressed planes exist, and plane's layer ID
+	 *     is not DE_VIDEO1, it can use half of the available memory.
 	 *
 	 * Note: this algorithm assumes that the order in which the planes are
 	 * checked always has DE_VIDEO1 plane first in the list if it is
@@ -372,7 +373,9 @@ static int malidp_crtc_atomic_check(struct drm_crtc *crtc,
 
 	/* first count the number of rotated planes */
 	drm_atomic_crtc_state_for_each_plane_state(plane, pstate, state) {
-		if (pstate->rotation & MALIDP_ROTATED_MASK)
+		struct drm_framebuffer *fb = pstate->fb;
+
+		if ((pstate->rotation & MALIDP_ROTATED_MASK) || fb->modifier)
 			rotated_planes++;
 	}
 
@@ -388,8 +391,9 @@ static int malidp_crtc_atomic_check(struct drm_crtc *crtc,
 	drm_atomic_crtc_state_for_each_plane_state(plane, pstate, state) {
 		struct malidp_plane *mp = to_malidp_plane(plane);
 		struct malidp_plane_state *ms = to_malidp_plane_state(pstate);
+		struct drm_framebuffer *fb = pstate->fb;
 
-		if (pstate->rotation & MALIDP_ROTATED_MASK) {
+		if ((pstate->rotation & MALIDP_ROTATED_MASK) || fb->modifier) {
 			/* process current plane */
 			rotated_planes--;
 
diff --git a/drivers/gpu/drm/arm/malidp_hw.c b/drivers/gpu/drm/arm/malidp_hw.c
index b33000634a4ee..5549092e6c36a 100644
--- a/drivers/gpu/drm/arm/malidp_hw.c
+++ b/drivers/gpu/drm/arm/malidp_hw.c
@@ -85,41 +85,43 @@ static const struct malidp_format_id malidp550_de_formats[] = {
 
 static const struct malidp_layer malidp500_layers[] = {
 	/*  id, base address, fb pointer address base, stride offset,
-		yuv2rgb matrix offset, mmu control register offset */
+	    yuv2rgb matrix offset, mmu control register offset, rotation_features */
 	{ DE_VIDEO1, MALIDP500_DE_LV_BASE, MALIDP500_DE_LV_PTR_BASE,
-		MALIDP_DE_LV_STRIDE0, MALIDP500_LV_YUV2RGB, 0 },
+		MALIDP_DE_LV_STRIDE0, MALIDP500_LV_YUV2RGB, 0, ROTATE_ANY },
 	{ DE_GRAPHICS1, MALIDP500_DE_LG1_BASE, MALIDP500_DE_LG1_PTR_BASE,
-		MALIDP_DE_LG_STRIDE, 0, 0 },
+		MALIDP_DE_LG_STRIDE, 0, 0, ROTATE_ANY },
 	{ DE_GRAPHICS2, MALIDP500_DE_LG2_BASE, MALIDP500_DE_LG2_PTR_BASE,
-		MALIDP_DE_LG_STRIDE, 0, 0 },
+		MALIDP_DE_LG_STRIDE, 0, 0, ROTATE_ANY },
 };
 
 static const struct malidp_layer malidp550_layers[] = {
 	/*  id, base address, fb pointer address base, stride offset,
-		yuv2rgb matrix offset, mmu control register offset */
+		yuv2rgb matrix offset, mmu control register offset, rotation_features */
 	{ DE_VIDEO1, MALIDP550_DE_LV1_BASE, MALIDP550_DE_LV1_PTR_BASE,
-		MALIDP_DE_LV_STRIDE0, MALIDP550_LV_YUV2RGB, 0 },
+		MALIDP_DE_LV_STRIDE0, MALIDP550_LV_YUV2RGB, 0, ROTATE_ANY },
 	{ DE_GRAPHICS1, MALIDP550_DE_LG_BASE, MALIDP550_DE_LG_PTR_BASE,
-		MALIDP_DE_LG_STRIDE, 0, 0 },
+		MALIDP_DE_LG_STRIDE, 0, 0, ROTATE_ANY },
 	{ DE_VIDEO2, MALIDP550_DE_LV2_BASE, MALIDP550_DE_LV2_PTR_BASE,
-		MALIDP_DE_LV_STRIDE0, MALIDP550_LV_YUV2RGB, 0 },
+		MALIDP_DE_LV_STRIDE0, MALIDP550_LV_YUV2RGB, 0, ROTATE_ANY },
 	{ DE_SMART, MALIDP550_DE_LS_BASE, MALIDP550_DE_LS_PTR_BASE,
-		MALIDP550_DE_LS_R1_STRIDE, 0, 0 },
+		MALIDP550_DE_LS_R1_STRIDE, 0, 0, ROTATE_NONE },
 };
 
 static const struct malidp_layer malidp650_layers[] = {
 	/*  id, base address, fb pointer address base, stride offset,
-		yuv2rgb matrix offset, mmu control register offset */
+		yuv2rgb matrix offset, mmu control register offset, rotation_features */
 	{ DE_VIDEO1, MALIDP550_DE_LV1_BASE, MALIDP550_DE_LV1_PTR_BASE,
 		MALIDP_DE_LV_STRIDE0, MALIDP550_LV_YUV2RGB,
-		MALIDP650_DE_LV_MMU_CTRL },
+		MALIDP650_DE_LV_MMU_CTRL, ROTATE_ANY },
 	{ DE_GRAPHICS1, MALIDP550_DE_LG_BASE, MALIDP550_DE_LG_PTR_BASE,
-		MALIDP_DE_LG_STRIDE, 0, MALIDP650_DE_LG_MMU_CTRL },
+		MALIDP_DE_LG_STRIDE, 0, MALIDP650_DE_LG_MMU_CTRL,
+		ROTATE_COMPRESSED },
 	{ DE_VIDEO2, MALIDP550_DE_LV2_BASE, MALIDP550_DE_LV2_PTR_BASE,
 		MALIDP_DE_LV_STRIDE0, MALIDP550_LV_YUV2RGB,
-		MALIDP650_DE_LV_MMU_CTRL },
+		MALIDP650_DE_LV_MMU_CTRL, ROTATE_ANY },
 	{ DE_SMART, MALIDP550_DE_LS_BASE, MALIDP550_DE_LS_PTR_BASE,
-		MALIDP550_DE_LS_R1_STRIDE, 0, MALIDP650_DE_LS_MMU_CTRL },
+		MALIDP550_DE_LS_R1_STRIDE, 0, MALIDP650_DE_LS_MMU_CTRL,
+		ROTATE_NONE },
 };
 
 #define SE_N_SCALING_COEFFS	96
@@ -314,10 +316,6 @@ static void malidp500_modeset(struct malidp_hw_device *hwdev, struct videomode *
 
 static int malidp500_rotmem_required(struct malidp_hw_device *hwdev, u16 w, u16 h, u32 fmt)
 {
-	/* RGB888 or BGR888 can't be rotated */
-	if ((fmt == DRM_FORMAT_RGB888) || (fmt == DRM_FORMAT_BGR888))
-		return -EINVAL;
-
 	/*
 	 * Each layer needs enough rotation memory to fit 8 lines
 	 * worth of pixel data. Required size is then:
@@ -605,10 +603,6 @@ static int malidp550_rotmem_required(struct malidp_hw_device *hwdev, u16 w, u16
 {
 	u32 bytes_per_col;
 
-	/* raw RGB888 or BGR888 can't be rotated */
-	if ((fmt == DRM_FORMAT_RGB888) || (fmt == DRM_FORMAT_BGR888))
-		return -EINVAL;
-
 	switch (fmt) {
 	/* 8 lines at 4 bytes per pixel */
 	case DRM_FORMAT_ARGB2101010:
diff --git a/drivers/gpu/drm/arm/malidp_hw.h b/drivers/gpu/drm/arm/malidp_hw.h
index 0d7f9ea0ade89..3ab133d49bbad 100644
--- a/drivers/gpu/drm/arm/malidp_hw.h
+++ b/drivers/gpu/drm/arm/malidp_hw.h
@@ -36,6 +36,12 @@ enum {
 	SE_MEMWRITE = BIT(5),
 };
 
+enum rotation_features {
+	ROTATE_NONE,		/* does not support rotation at all */
+	ROTATE_ANY,		/* supports rotation on any buffers */
+	ROTATE_COMPRESSED,	/* supports rotation only on compressed buffers */
+};
+
 struct malidp_format_id {
 	u32 format;		/* DRM fourcc */
 	u8 layer;		/* bitmask of layers supporting it */
@@ -63,6 +69,7 @@ struct malidp_layer {
 	u16 stride_offset;	/* offset to the first stride register. */
 	s16 yuv2rgb_offset;	/* offset to the YUV->RGB matrix entries */
 	u16 mmu_ctrl_offset;    /* offset to the MMU control register */
+	enum rotation_features rot;	/* type of rotation supported */
 };
 
 enum malidp_scaling_coeff_set {
diff --git a/drivers/gpu/drm/arm/malidp_planes.c b/drivers/gpu/drm/arm/malidp_planes.c
index c21b44effa5a7..36d2952774b22 100644
--- a/drivers/gpu/drm/arm/malidp_planes.c
+++ b/drivers/gpu/drm/arm/malidp_planes.c
@@ -433,11 +433,20 @@ static int malidp_de_plane_check(struct drm_plane *plane,
 	if (ret)
 		return ret;
 
-	/* packed RGB888 / BGR888 can't be rotated or flipped */
-	if (state->rotation != DRM_MODE_ROTATE_0 &&
-	    (fb->format->format == DRM_FORMAT_RGB888 ||
-	     fb->format->format == DRM_FORMAT_BGR888))
-		return -EINVAL;
+	/* validate the rotation constraints for each layer */
+	if (state->rotation != DRM_MODE_ROTATE_0) {
+		if (mp->layer->rot == ROTATE_NONE)
+			return -EINVAL;
+		if ((mp->layer->rot == ROTATE_COMPRESSED) && !!(fb->modifier))
+			return -EINVAL;
+		/*
+		 * packed RGB888 / BGR888 can't be rotated or flipped
+		 * unless they are stored in a compressed way
+		 */
+		if ((fb->format->format == DRM_FORMAT_RGB888 ||
+		     fb->format->format == DRM_FORMAT_BGR888) && !!(fb->modifier))
+			return -EINVAL;
+	}
 
 	ms->rotmem_size = 0;
 	if (state->rotation & MALIDP_ROTATED_MASK) {
-- 
2.18.0