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Subject[PATCH 10/10] drm/sun4i: Add support for YUV-based formats in MB32 tiles
Date
This adds all the required configuration and support for handling YUV
formats tiled with the Allwinner MB32 modifier. This newly-introduced
YUV support should be in as good a shape as RGB support.

While this implementation covers most MB32-capable formats supported
by the frontend, only NV12-based formats were actually tested.
Since most of the logic is common, it is likely that other formats will
work just as well.

Signed-off-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
---
drivers/gpu/drm/sun4i/sun4i_backend.c | 10 +++-
drivers/gpu/drm/sun4i/sun4i_backend.h | 2 +-
drivers/gpu/drm/sun4i/sun4i_drv.c | 1 +
drivers/gpu/drm/sun4i/sun4i_frontend.c | 100 ++++++++++++++++++++++++++++-----
drivers/gpu/drm/sun4i/sun4i_frontend.h | 3 +-
drivers/gpu/drm/sun4i/sun4i_layer.c | 16 +++++-
6 files changed, 113 insertions(+), 19 deletions(-)

diff --git a/drivers/gpu/drm/sun4i/sun4i_backend.c b/drivers/gpu/drm/sun4i/sun4i_backend.c
index 3de7f3a427c3..335c444b1547 100644
--- a/drivers/gpu/drm/sun4i/sun4i_backend.c
+++ b/drivers/gpu/drm/sun4i/sun4i_backend.c
@@ -147,11 +147,14 @@ static const uint32_t sun4i_backend_formats[] = {
DRM_FORMAT_VYUY,
};

-bool sun4i_backend_format_is_supported(uint32_t fmt)
+bool sun4i_backend_format_is_supported(uint32_t fmt, uint64_t modifier)
{
bool found = false;
unsigned int i;

+ if (modifier == DRM_FORMAT_MOD_ALLWINNER_MB32_TILED)
+ return false;
+
for (i = 0; i < ARRAY_SIZE(sun4i_backend_formats); i++) {
if (sun4i_backend_formats[i] == fmt) {
found = true;
@@ -437,7 +440,8 @@ static bool sun4i_backend_plane_uses_frontend(struct drm_plane_state *state)
* not supported by either. There is still room to check this later in
* the atomic check process.
*/
- if (!sun4i_backend_format_is_supported(fb->format->format))
+ if (!sun4i_backend_format_is_supported(fb->format->format,
+ fb->modifier))
return true;

/*
@@ -489,7 +493,7 @@ static int sun4i_backend_atomic_check(struct sunxi_engine *engine,
struct drm_format_name_buf format_name;

if (sun4i_backend_plane_uses_frontend(plane_state)) {
- if (!sun4i_frontend_format_is_supported(fb->format->format)) {
+ if (!sun4i_frontend_plane_check(plane_state)) {
DRM_DEBUG_DRIVER("Frontend plane check failed\n");
return -EINVAL;
}
diff --git a/drivers/gpu/drm/sun4i/sun4i_backend.h b/drivers/gpu/drm/sun4i/sun4i_backend.h
index a7bfc38f12bd..bd93808c3ee7 100644
--- a/drivers/gpu/drm/sun4i/sun4i_backend.h
+++ b/drivers/gpu/drm/sun4i/sun4i_backend.h
@@ -207,6 +207,6 @@ int sun4i_backend_update_layer_zpos(struct sun4i_backend *backend,
int layer, struct drm_plane *plane);
void sun4i_backend_disable_layer_frontend(struct sun4i_backend *backend,
int layer);
-bool sun4i_backend_format_is_supported(uint32_t fmt);
+bool sun4i_backend_format_is_supported(uint32_t fmt, uint64_t modifier);

#endif /* _SUN4I_BACKEND_H_ */
diff --git a/drivers/gpu/drm/sun4i/sun4i_drv.c b/drivers/gpu/drm/sun4i/sun4i_drv.c
index e9cb03d34b44..41888743722a 100644
--- a/drivers/gpu/drm/sun4i/sun4i_drv.c
+++ b/drivers/gpu/drm/sun4i/sun4i_drv.c
@@ -208,6 +208,7 @@ static int sun4i_drv_bind(struct device *dev)
}

drm_mode_config_init(drm);
+ drm->mode_config.allow_fb_modifiers = true;

ret = component_bind_all(drm->dev, drm);
if (ret) {
diff --git a/drivers/gpu/drm/sun4i/sun4i_frontend.c b/drivers/gpu/drm/sun4i/sun4i_frontend.c
index d9e58e96119c..85f75046712c 100644
--- a/drivers/gpu/drm/sun4i/sun4i_frontend.c
+++ b/drivers/gpu/drm/sun4i/sun4i_frontend.c
@@ -99,16 +99,56 @@ void sun4i_frontend_update_buffer(struct sun4i_frontend *frontend,
width = state->src_w >> 16;
height = state->src_h >> 16;

- regmap_write(frontend->regs, SUN4I_FRONTEND_LINESTRD0_REG,
- fb->pitches[0]);
+ if (fb->modifier == DRM_FORMAT_MOD_ALLWINNER_MB32_TILED) {
+ /*
+ * In MB32 tiled mode, the stride is defined as the distance
+ * between the start of the end line of the current tile and
+ * the start of the first line in the next vertical tile.
+ *
+ * Tiles are represented linearly in memory, thus the end line
+ * of current tile starts at: 31 * 32 (31 lines of 32 cols),
+ * the next vertical tile starts at: 32-bit-aligned-width * 32
+ * and the distance is: 32 * (32-bit-aligned-width - 31).
+ */
+
+ stride = (fb->pitches[0] - 31) * 32;
+ regmap_write(frontend->regs, SUN4I_FRONTEND_LINESTRD0_REG,
+ stride);
+
+ /* Offset of the bottom-right point in the end tile. */
+ offset = (width + (32 - 1)) & (32 - 1);
+ regmap_write(frontend->regs, SUN4I_FRONTEND_TB_OFF0_REG,
+ SUN4I_FRONTEND_TB_OFF_X1(offset));
+
+ if (drm_format_num_planes(format) > 1) {
+ stride = (fb->pitches[1] - 31) * 32;
+ regmap_write(frontend->regs, SUN4I_FRONTEND_LINESTRD1_REG,
+ stride);
+
+ regmap_write(frontend->regs, SUN4I_FRONTEND_TB_OFF1_REG,
+ SUN4I_FRONTEND_TB_OFF_X1(offset));
+ }
+
+ if (drm_format_num_planes(format) > 2) {
+ stride = (fb->pitches[2] - 31) * 32;
+ regmap_write(frontend->regs, SUN4I_FRONTEND_LINESTRD2_REG,
+ stride);
+
+ regmap_write(frontend->regs, SUN4I_FRONTEND_TB_OFF2_REG,
+ SUN4I_FRONTEND_TB_OFF_X1(offset));
+ }
+ } else {
+ regmap_write(frontend->regs, SUN4I_FRONTEND_LINESTRD0_REG,
+ fb->pitches[0]);

- if (drm_format_num_planes(format) > 1)
- regmap_write(frontend->regs, SUN4I_FRONTEND_LINESTRD1_REG,
- fb->pitches[1]);
+ if (drm_format_num_planes(format) > 1)
+ regmap_write(frontend->regs, SUN4I_FRONTEND_LINESTRD1_REG,
+ fb->pitches[1]);

- if (drm_format_num_planes(format) > 2)
- regmap_write(frontend->regs, SUN4I_FRONTEND_LINESTRD2_REG,
- fb->pitches[2]);
+ if (drm_format_num_planes(format) > 2)
+ regmap_write(frontend->regs, SUN4I_FRONTEND_LINESTRD2_REG,
+ fb->pitches[2]);
+ }

/* Set the physical address of the buffer in memory */
paddr = drm_fb_cma_get_gem_addr(fb, state, 0);
@@ -155,14 +195,22 @@ static int sun4i_frontend_drm_format_to_input_fmt(uint32_t fmt, u32 *val)
return 0;
}

-static int sun4i_frontend_drm_format_to_input_mode(uint32_t fmt, u32 *val)
+static int sun4i_frontend_drm_format_to_input_mode(uint32_t fmt, u32 *val,
+ uint64_t modifier)
{
+ bool tiled = modifier == DRM_FORMAT_MOD_ALLWINNER_MB32_TILED;
+
+ if (tiled && !sun4i_format_supports_tiling(fmt))
+ return -EINVAL;
+
if (sun4i_format_is_packed(fmt))
*val = SUN4I_FRONTEND_INPUT_FMT_DATA_MOD_PACKED;
else if (sun4i_format_is_semiplanar(fmt))
- *val = SUN4I_FRONTEND_INPUT_FMT_DATA_MOD_SEMIPLANAR;
+ *val = tiled ? SUN4I_FRONTEND_INPUT_FMT_DATA_MOD_MB32_SEMIPLANAR
+ : SUN4I_FRONTEND_INPUT_FMT_DATA_MOD_SEMIPLANAR;
else if (sun4i_format_is_planar(fmt))
- *val = SUN4I_FRONTEND_INPUT_FMT_DATA_MOD_PLANAR;
+ *val = tiled ? SUN4I_FRONTEND_INPUT_FMT_DATA_MOD_MB32_PLANAR
+ : SUN4I_FRONTEND_INPUT_FMT_DATA_MOD_PLANAR;
else
return -EINVAL;

@@ -268,7 +316,7 @@ static const uint32_t sun4i_frontend_formats[] = {
DRM_FORMAT_YVU411,
};

-bool sun4i_frontend_format_is_supported(uint32_t fmt)
+bool sun4i_frontend_format_is_supported(uint32_t fmt, uint64_t modifier)
{
bool found = false;
unsigned int i;
@@ -283,6 +331,31 @@ bool sun4i_frontend_format_is_supported(uint32_t fmt)
if (!found)
return false;

+ if (modifier == DRM_FORMAT_MOD_ALLWINNER_MB32_TILED)
+ return sun4i_format_supports_tiling(fmt);
+
+ return true;
+}
+
+bool sun4i_frontend_plane_check(struct drm_plane_state *state)
+{
+ struct drm_framebuffer *fb = state->fb;
+ uint32_t format = fb->format->format;
+ uint32_t width = state->src_w >> 16;
+ uint64_t modifier = fb->modifier;
+ bool supported;
+
+ supported = sun4i_frontend_format_is_supported(format, modifier);
+ if (!supported)
+ return false;
+
+ /* Width is required to be even for MB32 tiled format. */
+ if (modifier == DRM_FORMAT_MOD_ALLWINNER_MB32_TILED &&
+ (width % 2) != 0) {
+ DRM_DEBUG_DRIVER("MB32 tiled format requires an even width\n");
+ return false;
+ }
+
return true;
}

@@ -320,7 +393,8 @@ int sun4i_frontend_update_formats(struct sun4i_frontend *frontend,
return ret;
}

- ret = sun4i_frontend_drm_format_to_input_mode(format, &in_mod_val);
+ ret = sun4i_frontend_drm_format_to_input_mode(format, &in_mod_val,
+ fb->modifier);
if (ret) {
DRM_DEBUG_DRIVER("Invalid input mode\n");
return ret;
diff --git a/drivers/gpu/drm/sun4i/sun4i_frontend.h b/drivers/gpu/drm/sun4i/sun4i_frontend.h
index 6dd1d18752f4..ab6ab4f16f74 100644
--- a/drivers/gpu/drm/sun4i/sun4i_frontend.h
+++ b/drivers/gpu/drm/sun4i/sun4i_frontend.h
@@ -134,7 +134,8 @@ void sun4i_frontend_update_coord(struct sun4i_frontend *frontend,
struct drm_plane *plane);
int sun4i_frontend_update_formats(struct sun4i_frontend *frontend,
struct drm_plane *plane, uint32_t out_fmt);
-bool sun4i_frontend_format_is_supported(uint32_t fmt);
+bool sun4i_frontend_format_is_supported(uint32_t fmt, uint64_t modifier);
+bool sun4i_frontend_plane_check(struct drm_plane_state *plane_state);
bool sun4i_frontend_format_chroma_requires_swap(uint32_t fmt);

#endif /* _SUN4I_FRONTEND_H_ */
diff --git a/drivers/gpu/drm/sun4i/sun4i_layer.c b/drivers/gpu/drm/sun4i/sun4i_layer.c
index a39eed6a0e75..d456148ed4b3 100644
--- a/drivers/gpu/drm/sun4i/sun4i_layer.c
+++ b/drivers/gpu/drm/sun4i/sun4i_layer.c
@@ -114,6 +114,13 @@ static void sun4i_backend_layer_atomic_update(struct drm_plane *plane,
sun4i_backend_layer_enable(backend, layer->id, true);
}

+static bool sun4i_layer_format_mod_supported(struct drm_plane *plane,
+ uint32_t format, uint64_t modifier)
+{
+ return sun4i_backend_format_is_supported(format, modifier) ||
+ sun4i_frontend_format_is_supported(format, modifier);
+}
+
static const struct drm_plane_helper_funcs sun4i_backend_layer_helper_funcs = {
.atomic_disable = sun4i_backend_layer_atomic_disable,
.atomic_update = sun4i_backend_layer_atomic_update,
@@ -126,6 +133,7 @@ static const struct drm_plane_funcs sun4i_backend_layer_funcs = {
.disable_plane = drm_atomic_helper_disable_plane,
.reset = sun4i_backend_layer_reset,
.update_plane = drm_atomic_helper_update_plane,
+ .format_mod_supported = sun4i_layer_format_mod_supported,
};

static const uint32_t sun4i_layer_formats[] = {
@@ -161,6 +169,12 @@ static const uint32_t sun4i_layer_formats[] = {
DRM_FORMAT_YVU411,
};

+static const uint64_t sun4i_layer_modifiers[] = {
+ DRM_FORMAT_MOD_LINEAR,
+ DRM_FORMAT_MOD_ALLWINNER_MB32_TILED,
+ DRM_FORMAT_MOD_INVALID
+};
+
static struct sun4i_layer *sun4i_layer_init_one(struct drm_device *drm,
struct sun4i_backend *backend,
enum drm_plane_type type)
@@ -177,7 +191,7 @@ static struct sun4i_layer *sun4i_layer_init_one(struct drm_device *drm,
&sun4i_backend_layer_funcs,
sun4i_layer_formats,
ARRAY_SIZE(sun4i_layer_formats),
- NULL, type, NULL);
+ sun4i_layer_modifiers, type, NULL);
if (ret) {
dev_err(drm->dev, "Couldn't initialize layer\n");
return ERR_PTR(ret);
--
2.16.2
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