Subject: [PATCH] drm/rockchip: Add AFBC support

From: Andrzej Pietrasiewicz <[email-masked]>
Date: Mon, 23 Sep 2019 14:20:13 +0200

From: Ezequiel Garcia <[email-masked]>

AFBC is a proprietary lossless image compression protocol and format.
It helps reduce memory bandwidth of the graphics pipeline operations.
This, in turn, improves power efficiency.

Signed-off-by: Ezequiel Garcia <[email-masked]>
[locking improvements]
Signed-off-by: Tomeu Vizoso <[email-masked]>
[squashing the above, commit message and Rockchip AFBC modifier]
Signed-off-by: Andrzej Pietrasiewicz <[email-masked]>
---
 drivers/gpu/drm/rockchip/rockchip_drm_fb.c  | 27 ++++++
 drivers/gpu/drm/rockchip/rockchip_drm_vop.c | 94 ++++++++++++++++++++-
 drivers/gpu/drm/rockchip/rockchip_drm_vop.h | 12 +++
 drivers/gpu/drm/rockchip/rockchip_vop_reg.c | 18 ++++
 include/uapi/drm/drm_fourcc.h               |  3 +
 5 files changed, 151 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_fb.c b/drivers/gpu/drm/rockchip/rockchip_drm_fb.c
index 64ca87cf6d50..5178939a9c29 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_fb.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_fb.c
@@ -24,6 +24,27 @@ static const struct drm_framebuffer_funcs rockchip_drm_fb_funcs = {
 	.dirty	       = drm_atomic_helper_dirtyfb,
 };
 
+static int
+rockchip_verify_afbc_mod(struct drm_device *dev,
+			 const struct drm_mode_fb_cmd2 *mode_cmd)
+{
+	if (mode_cmd->modifier[0] &
+	    ~DRM_FORMAT_MOD_ARM_AFBC(AFBC_FORMAT_MOD_ROCKCHIP)) {
+		DRM_DEV_ERROR(dev->dev,
+			      "Unsupported format modifier 0x%llx\n",
+			      mode_cmd->modifier[0]);
+		return -EINVAL;
+	}
+
+	if (mode_cmd->width > 2560) {
+		DRM_DEV_ERROR(dev->dev,
+			      "Unsupported width %d\n", mode_cmd->width);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
 static struct drm_framebuffer *
 rockchip_fb_alloc(struct drm_device *dev, const struct drm_mode_fb_cmd2 *mode_cmd,
 		  struct drm_gem_object **obj, unsigned int num_planes)
@@ -32,6 +53,12 @@ rockchip_fb_alloc(struct drm_device *dev, const struct drm_mode_fb_cmd2 *mode_cm
 	int ret;
 	int i;
 
+	if (mode_cmd->modifier[0]) {
+		ret = rockchip_verify_afbc_mod(dev, mode_cmd);
+		if (ret)
+			return ERR_PTR(ret);
+	}
+
 	fb = kzalloc(sizeof(*fb), GFP_KERNEL);
 	if (!fb)
 		return ERR_PTR(-ENOMEM);
diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
index 21b68eea46cc..50bf214d21da 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
@@ -46,6 +46,13 @@
 		vop_reg_set(vop, &win->phy->scl->ext->name, \
 			    win->base, ~0, v, #name)
 
+#define VOP_AFBC_SET(x, name, v) \
+	do { \
+		if (vop->data->afbc) \
+			vop_reg_set(vop, &vop->data->afbc->name, \
+				0, ~0, v, #name); \
+	} while (0)
+
 #define VOP_WIN_YUV2YUV_SET(vop, win_yuv2yuv, name, v) \
 	do { \
 		if (win_yuv2yuv && win_yuv2yuv->name.mask) \
@@ -123,6 +130,8 @@ struct vop {
 	struct drm_device *drm_dev;
 	bool is_enabled;
 
+	struct vop_win *afbc_win;
+
 	struct completion dsp_hold_completion;
 
 	/* protected by dev->event_lock */
@@ -245,6 +254,30 @@ static bool has_rb_swapped(uint32_t format)
 	}
 }
 
+#define AFBC_FMT_RGB565        0x0
+#define AFBC_FMT_U8U8U8U8      0x5
+#define AFBC_FMT_U8U8U8        0x4
+
+static int vop_convert_afbc_format(uint32_t format)
+{
+	switch (format) {
+	case DRM_FORMAT_XRGB8888:
+	case DRM_FORMAT_ARGB8888:
+	case DRM_FORMAT_XBGR8888:
+	case DRM_FORMAT_ABGR8888:
+		return AFBC_FMT_U8U8U8U8;
+	case DRM_FORMAT_RGB888:
+	case DRM_FORMAT_BGR888:
+		return AFBC_FMT_U8U8U8;
+	case DRM_FORMAT_RGB565:
+	case DRM_FORMAT_BGR565:
+		return AFBC_FMT_RGB565;
+	default:
+		DRM_ERROR("unsupported afbc format[%08x]\n", format);
+		return -EINVAL;
+	}
+}
+
 static enum vop_data_format vop_convert_format(uint32_t format)
 {
 	switch (format) {
@@ -587,10 +620,16 @@ static int vop_enable(struct drm_crtc *crtc)
 
 		vop_win_disable(vop, win);
 	}
-	spin_unlock(&vop->reg_lock);
+
+	if (vop->data->afbc) {
+		VOP_AFBC_SET(vop, enable, 0);
+		vop->afbc_win = NULL;
+	}
 
 	vop_cfg_done(vop);
 
+	spin_unlock(&vop->reg_lock);
+
 	/*
 	 * At here, vop clock & iommu is enable, R/W vop regs would be safe.
 	 */
@@ -719,6 +758,32 @@ static int vop_plane_atomic_check(struct drm_plane *plane,
 		return -EINVAL;
 	}
 
+	if (fb->modifier & DRM_FORMAT_MOD_ARM_AFBC(AFBC_FORMAT_MOD_ROCKCHIP)) {
+		struct vop *vop = to_vop(crtc);
+
+		if (!vop->data->afbc) {
+			DRM_ERROR("VOP does not support AFBC\n");
+			return -EINVAL;
+		}
+
+		ret = vop_convert_afbc_format(fb->format->format);
+		if (ret < 0)
+			return ret;
+
+		if (state->src.x1 || state->src.y1) {
+			DRM_ERROR("AFBC does not support offset display\n");
+			DRM_ERROR("xpos=%d, ypos=%d, offset=%d\n",
+				state->src.x1, state->src.y1, fb->offsets[0]);
+			return -EINVAL;
+		}
+
+		if (state->rotation && state->rotation != DRM_MODE_ROTATE_0) {
+			DRM_ERROR("AFBC does not support rotation\n");
+			DRM_ERROR("rotation=%d\n", state->rotation);
+			return -EINVAL;
+		}
+	}
+
 	return 0;
 }
 
@@ -732,6 +797,9 @@ static void vop_plane_atomic_disable(struct drm_plane *plane,
 	if (!old_state->crtc)
 		return;
 
+	if (vop->afbc_win == vop_win)
+		vop->afbc_win = NULL;
+
 	spin_lock(&vop->reg_lock);
 
 	vop_win_disable(vop, win);
@@ -774,6 +842,9 @@ static void vop_plane_atomic_update(struct drm_plane *plane,
 	if (WARN_ON(!vop->is_enabled))
 		return;
 
+	if (vop->afbc_win == vop_win)
+		vop->afbc_win = NULL;
+
 	if (!state->visible) {
 		vop_plane_atomic_disable(plane, old_state);
 		return;
@@ -808,6 +879,20 @@ static void vop_plane_atomic_update(struct drm_plane *plane,
 
 	spin_lock(&vop->reg_lock);
 
+	if (fb->modifier & DRM_FORMAT_MOD_ARM_AFBC(AFBC_FORMAT_MOD_ROCKCHIP)) {
+		int afbc_format = vop_convert_afbc_format(fb->format->format);
+
+		VOP_AFBC_SET(vop, format, afbc_format | 1 << 4);
+		VOP_AFBC_SET(vop, hreg_block_split, 0);
+		VOP_AFBC_SET(vop, win_sel, win_index);
+		VOP_AFBC_SET(vop, hdr_ptr, dma_addr);
+		VOP_AFBC_SET(vop, pic_size, act_info);
+
+		vop->afbc_win = vop_win;
+
+		pr_info("AFBC on plane %s\n", plane->name);
+	}
+
 	VOP_WIN_SET(vop, win, format, format);
 	VOP_WIN_SET(vop, win, yrgb_vir, DIV_ROUND_UP(fb->pitches[0], 4));
 	VOP_WIN_SET(vop, win, yrgb_mst, dma_addr);
@@ -1163,6 +1248,7 @@ static void vop_crtc_atomic_flush(struct drm_crtc *crtc,
 
 	spin_lock(&vop->reg_lock);
 
+	VOP_AFBC_SET(vop, enable, vop->afbc_win ? 0x1 : 0);
 	vop_cfg_done(vop);
 
 	spin_unlock(&vop->reg_lock);
@@ -1471,7 +1557,8 @@ static int vop_create_crtc(struct vop *vop)
 					       0, &vop_plane_funcs,
 					       win_data->phy->data_formats,
 					       win_data->phy->nformats,
-					       NULL, win_data->type, NULL);
+					       win_data->phy->format_modifiers,
+					       win_data->type, NULL);
 		if (ret) {
 			DRM_DEV_ERROR(vop->dev, "failed to init plane %d\n",
 				      ret);
@@ -1511,7 +1598,8 @@ static int vop_create_crtc(struct vop *vop)
 					       &vop_plane_funcs,
 					       win_data->phy->data_formats,
 					       win_data->phy->nformats,
-					       NULL, win_data->type, NULL);
+					       win_data->phy->format_modifiers,
+					       win_data->type, NULL);
 		if (ret) {
 			DRM_DEV_ERROR(vop->dev, "failed to init overlay %d\n",
 				      ret);
diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop.h b/drivers/gpu/drm/rockchip/rockchip_drm_vop.h
index 2149a889c29d..dc8b12025269 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_vop.h
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop.h
@@ -77,6 +77,16 @@ struct vop_misc {
 	struct vop_reg global_regdone_en;
 };
 
+struct vop_afbc {
+	struct vop_reg enable;
+	struct vop_reg win_sel;
+	struct vop_reg format;
+	struct vop_reg hreg_block_split;
+	struct vop_reg pic_size;
+	struct vop_reg hdr_ptr;
+	struct vop_reg rstn;
+};
+
 struct vop_intr {
 	const int *intrs;
 	uint32_t nintrs;
@@ -128,6 +138,7 @@ struct vop_win_phy {
 	const struct vop_scl_regs *scl;
 	const uint32_t *data_formats;
 	uint32_t nformats;
+	const uint64_t *format_modifiers;
 
 	struct vop_reg enable;
 	struct vop_reg gate;
@@ -169,6 +180,7 @@ struct vop_data {
 	const struct vop_output *output;
 	const struct vop_win_yuv2yuv_data *win_yuv2yuv;
 	const struct vop_win_data *win;
+	const struct vop_afbc *afbc;
 	unsigned int win_size;
 
 #define VOP_FEATURE_OUTPUT_RGB10	BIT(0)
diff --git a/drivers/gpu/drm/rockchip/rockchip_vop_reg.c b/drivers/gpu/drm/rockchip/rockchip_vop_reg.c
index 7b9c74750f6d..e9ff0c43c396 100644
--- a/drivers/gpu/drm/rockchip/rockchip_vop_reg.c
+++ b/drivers/gpu/drm/rockchip/rockchip_vop_reg.c
@@ -30,6 +30,12 @@
 #define VOP_REG_MASK_SYNC(off, _mask, _shift) \
 		_VOP_REG(off, _mask, _shift, true, false)
 
+static const uint64_t format_modifiers_afbc[] = {
+	DRM_FORMAT_MOD_ARM_AFBC(AFBC_FORMAT_MOD_ROCKCHIP),
+	DRM_FORMAT_MOD_LINEAR,
+	DRM_FORMAT_MOD_INVALID
+};
+
 static const uint32_t formats_win_full[] = {
 	DRM_FORMAT_XRGB8888,
 	DRM_FORMAT_ARGB8888,
@@ -667,6 +673,7 @@ static const struct vop_win_phy rk3368_win01_data = {
 	.scl = &rk3288_win_full_scl,
 	.data_formats = formats_win_full,
 	.nformats = ARRAY_SIZE(formats_win_full),
+	.format_modifiers = format_modifiers_afbc,
 	.enable = VOP_REG(RK3368_WIN0_CTRL0, 0x1, 0),
 	.format = VOP_REG(RK3368_WIN0_CTRL0, 0x7, 1),
 	.rb_swap = VOP_REG(RK3368_WIN0_CTRL0, 0x1, 12),
@@ -758,6 +765,16 @@ static const struct vop_data rk3366_vop = {
 	.win_size = ARRAY_SIZE(rk3368_vop_win_data),
 };
 
+static const struct vop_afbc rk3399_afbc = {
+	.rstn = VOP_REG(RK3399_AFBCD0_CTRL, 0x1, 3),
+	.enable = VOP_REG(RK3399_AFBCD0_CTRL, 0x1, 0),
+	.win_sel = VOP_REG(RK3399_AFBCD0_CTRL, 0x3, 1),
+	.format = VOP_REG(RK3399_AFBCD0_CTRL, 0x1f, 16),
+	.hreg_block_split = VOP_REG(RK3399_AFBCD0_CTRL, 0x1, 21),
+	.hdr_ptr = VOP_REG(RK3399_AFBCD0_HDR_PTR, 0xffffffff, 0),
+	.pic_size = VOP_REG(RK3399_AFBCD0_PIC_SIZE, 0xffffffff, 0),
+};
+
 static const struct vop_output rk3399_output = {
 	.dp_pin_pol = VOP_REG(RK3399_DSP_CTRL1, 0xf, 16),
 	.rgb_pin_pol = VOP_REG(RK3368_DSP_CTRL1, 0xf, 16),
@@ -808,6 +825,7 @@ static const struct vop_data rk3399_vop_big = {
 	.modeset = &rk3288_modeset,
 	.output = &rk3399_output,
 	.misc = &rk3368_misc,
+	.afbc = &rk3399_afbc,
 	.win = rk3368_vop_win_data,
 	.win_size = ARRAY_SIZE(rk3368_vop_win_data),
 	.win_yuv2yuv = rk3399_vop_big_win_yuv2yuv_data,
diff --git a/include/uapi/drm/drm_fourcc.h b/include/uapi/drm/drm_fourcc.h
index 3feeaa3f987a..ba6caf06c824 100644
--- a/include/uapi/drm/drm_fourcc.h
+++ b/include/uapi/drm/drm_fourcc.h
@@ -742,6 +742,9 @@ extern "C" {
  */
 #define AFBC_FORMAT_MOD_BCH     (1ULL << 11)
 
+#define AFBC_FORMAT_MOD_ROCKCHIP \
+	(AFBC_FORMAT_MOD_BLOCK_SIZE_16x16 | AFBC_FORMAT_MOD_SPARSE)
+
 /*
  * Allwinner tiled modifier
  *
-- 
2.17.1

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