Re: [PATCH v2 08/10] drm/ingenic: Add support for OSD mode

From: Paul Cercueil
Date: Tue Jun 30 2020 - 10:39:37 EST

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In reply to: Sam Ravnborg: "Re: [PATCH v2 08/10] drm/ingenic: Add support for OSD mode"
Next in thread: Paul Cercueil: "[PATCH v2 09/10] drm/ingenic: Add support for the IPU"
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Hi Sam,

Le mar. 30 juin 2020 à 14:05, Sam Ravnborg <sam@xxxxxxxxxxxx> a écrit :

Hi Paul.

On Tue, Jun 30, 2020 at 01:52:08AM +0200, Paul Cercueil wrote:

All Ingenic SoCs starting from the JZ4725B support OSD mode.

In this mode, two separate planes can be used. They can have different
positions and sizes, and one can be overlayed on top of the other.

Signed-off-by: Paul Cercueil <paul@xxxxxxxxxxxxxxx>

OSD? On screen Display?

Yes... That's how it's called in the programming manual.

I believe it's because this mode adds the possibility to create OSDs with the overlay plane.

Some random comments in the following - from my attempt to follow the
code.

Sam

---

Notes:
v2: Use fallthrough; instead of /* fall-through */

drivers/gpu/drm/ingenic/ingenic-drm-drv.c | 271 +++++++++++++++++-----
drivers/gpu/drm/ingenic/ingenic-drm.h | 35 +++
2 files changed, 254 insertions(+), 52 deletions(-)

diff --git a/drivers/gpu/drm/ingenic/ingenic-drm-drv.c b/drivers/gpu/drm/ingenic/ingenic-drm-drv.c
index 6590b61cb915..a8573da1d577 100644
--- a/drivers/gpu/drm/ingenic/ingenic-drm-drv.c
+++ b/drivers/gpu/drm/ingenic/ingenic-drm-drv.c
@@ -43,12 +43,13 @@ struct ingenic_dma_hwdesc {

struct jz_soc_info {
bool needs_dev_clk;
+ bool has_osd;
unsigned int max_width, max_height;
};

struct ingenic_drm {
struct drm_device drm;
- struct drm_plane primary;
+ struct drm_plane f0, f1;

A small comment about when f0 and f1 is used and how they are the
primary plane would be good here.

Right.

struct drm_crtc crtc;
struct drm_encoder encoder;

@@ -57,8 +58,8 @@ struct ingenic_drm {
struct clk *lcd_clk, *pix_clk;
const struct jz_soc_info *soc_info;

- struct ingenic_dma_hwdesc *dma_hwdesc;
- dma_addr_t dma_hwdesc_phys;
+ struct ingenic_dma_hwdesc *dma_hwdesc[2];
+ dma_addr_t dma_hwdesc_phys[2];

bool panel_is_sharp;
};
@@ -90,7 +91,7 @@ static const struct regmap_config ingenic_drm_regmap_config = {
.val_bits = 32,
.reg_stride = 4,

- .max_register = JZ_REG_LCD_CMD1,
+ .max_register = JZ_REG_LCD_SIZE1,
.writeable_reg = ingenic_drm_writeable_reg,
};

@@ -110,11 +111,6 @@ drm_encoder_get_priv(struct drm_encoder *encoder)
return container_of(encoder, struct ingenic_drm, encoder);
}

-static inline struct ingenic_drm *drm_plane_get_priv(struct drm_plane *plane)
-{
- return container_of(plane, struct ingenic_drm, primary);
-}
-
static void ingenic_drm_crtc_atomic_enable(struct drm_crtc *crtc,
struct drm_crtc_state *state)
{
@@ -185,34 +181,17 @@ static void ingenic_drm_crtc_update_timings(struct ingenic_drm *priv,
regmap_write(priv->map, JZ_REG_LCD_SPL, hpe << 16 | (hpe + 1));
regmap_write(priv->map, JZ_REG_LCD_REV, mode->htotal << 16);
}
-}
-
-static void ingenic_drm_crtc_update_ctrl(struct ingenic_drm *priv,
- const struct drm_format_info *finfo)
-{
- unsigned int ctrl = JZ_LCD_CTRL_OFUP | JZ_LCD_CTRL_BURST_16;
-
- switch (finfo->format) {
- case DRM_FORMAT_XRGB1555:
- ctrl |= JZ_LCD_CTRL_RGB555;
- /* fall-through */
- case DRM_FORMAT_RGB565:
- ctrl |= JZ_LCD_CTRL_BPP_15_16;
- break;
- case DRM_FORMAT_XRGB8888:
- ctrl |= JZ_LCD_CTRL_BPP_18_24;
- break;
- }

regmap_update_bits(priv->map, JZ_REG_LCD_CTRL,
- JZ_LCD_CTRL_OFUP | JZ_LCD_CTRL_BURST_16 |
- JZ_LCD_CTRL_BPP_MASK, ctrl);
+ JZ_LCD_CTRL_OFUP | JZ_LCD_CTRL_BURST_16,
+ JZ_LCD_CTRL_OFUP | JZ_LCD_CTRL_BURST_16);

It looks like regmap_update_bits() is no longer the best choice here.

I see that regmap_set_bits() appeared in 5.8, I'll just use that.

}

static int ingenic_drm_crtc_atomic_check(struct drm_crtc *crtc,
struct drm_crtc_state *state)
{
struct ingenic_drm *priv = drm_crtc_get_priv(crtc);
+ struct drm_plane_state *f1_state, *f0_state;
long rate;

if (!drm_atomic_crtc_needs_modeset(state))
@@ -227,6 +206,15 @@ static int ingenic_drm_crtc_atomic_check(struct drm_crtc *crtc,
if (rate < 0)
return rate;

+ if (priv->soc_info->has_osd) {
+ f1_state = drm_atomic_get_plane_state(state->state, &priv->f1);
+ f0_state = drm_atomic_get_plane_state(state->state, &priv->f0);
+
+ /* If all the planes are disabled, we won't get a VBLANK IRQ */
+ if (!f1_state->fb && !f0_state->fb)
+ state->no_vblank = true;
+ }
+
return 0;
}

@@ -236,14 +224,9 @@ static void ingenic_drm_crtc_atomic_flush(struct drm_crtc *crtc,
struct ingenic_drm *priv = drm_crtc_get_priv(crtc);
struct drm_crtc_state *state = crtc->state;
struct drm_pending_vblank_event *event = state->event;
- struct drm_framebuffer *drm_fb = crtc->primary->state->fb;
- const struct drm_format_info *finfo;

if (drm_atomic_crtc_needs_modeset(state)) {
- finfo = drm_format_info(drm_fb->format->format);
-
ingenic_drm_crtc_update_timings(priv, &state->mode);
- ingenic_drm_crtc_update_ctrl(priv, finfo);

clk_set_rate(priv->pix_clk, state->adjusted_mode.clock * 1000);
}
@@ -260,12 +243,149 @@ static void ingenic_drm_crtc_atomic_flush(struct drm_crtc *crtc,
}
}

+static int ingenic_drm_plane_atomic_check(struct drm_plane *plane,
+ struct drm_plane_state *state)
+{
+ struct ingenic_drm *priv = drm_device_get_priv(plane->dev);
+ struct drm_crtc_state *crtc_state;
+ struct drm_crtc *crtc = state->crtc ?: plane->state->crtc;
+ int ret;
+
+ if (!crtc)
+ return 0;
+
+ crtc_state = drm_atomic_get_existing_crtc_state(state->state, crtc);
+ if (WARN_ON(!crtc_state))
+ return -EINVAL;
+
+ ret = drm_atomic_helper_check_plane_state(state, crtc_state,
+ DRM_PLANE_HELPER_NO_SCALING,
+ DRM_PLANE_HELPER_NO_SCALING,
+ priv->soc_info->has_osd,
+ true);
+ if (ret)
+ return ret;
+
+ if (!priv->soc_info->has_osd &&
+ (state->src_x != 0 ||
+ (state->src_w >> 16) != state->crtc_w ||
+ (state->src_h >> 16) != state->crtc_h))
+ return -EINVAL;

This check could bebefit from a small comment.
I cannot see the purpose of " >> 16" on the src_* fields...

I can add a comment, yes.

The src_* fields of a drm_plane are in 16.16 fixed-point format, hence the >>16. I didn't invent that here.

+
+ /*
+ * Require full modeset if if enabling or disabling a plane, or changing
Too many ifs?

+ * its position, size or depth.
+ */
+ if (priv->soc_info->has_osd &&
+ (!plane->state->fb || !state->fb ||
+ plane->state->crtc_x != state->crtc_x ||
+ plane->state->crtc_y != state->crtc_y ||
+ plane->state->crtc_w != state->crtc_w ||
+ plane->state->crtc_h != state->crtc_h ||
+ plane->state->fb->format->format != state->fb->format->format))
+ crtc_state->mode_changed = true;
+
+ return 0;
+}
+
+static void ingenic_drm_plane_enable(struct ingenic_drm *priv,
+ struct drm_plane *plane)
+{
+ unsigned int en_bit;
+
+ if (priv->soc_info->has_osd) {
+ if (plane->type == DRM_PLANE_TYPE_PRIMARY)
+ en_bit = JZ_LCD_OSDC_F1EN;
+ else
+ en_bit = JZ_LCD_OSDC_F0EN;
+
+ regmap_update_bits(priv->map, JZ_REG_LCD_OSDC, en_bit, en_bit);

I think you can use a more direct way to do the assignment.
Like before where the same pattern was used (last two arguments the
same).

+ }
+}
+
+static void ingenic_drm_plane_atomic_disable(struct drm_plane *plane,
+ struct drm_plane_state *old_state)
+{
+ struct ingenic_drm *priv = drm_device_get_priv(plane->dev);
+ unsigned int en_bit;
+
+ if (priv->soc_info->has_osd) {
+ if (plane->type == DRM_PLANE_TYPE_PRIMARY)
+ en_bit = JZ_LCD_OSDC_F1EN;
+ else
+ en_bit = JZ_LCD_OSDC_F0EN;
+
+ regmap_update_bits(priv->map, JZ_REG_LCD_OSDC, en_bit, 0);
+ }
+}
+
+static void ingenic_drm_plane_config(struct ingenic_drm *priv,
+ struct drm_plane *plane, u32 fourcc)
+{
+ struct drm_plane_state *state = plane->state;
+ unsigned int xy_reg, size_reg;
+ unsigned int ctrl = 0;
+
+ ingenic_drm_plane_enable(priv, plane);
+
+ if (priv->soc_info->has_osd &&
+ plane->type == DRM_PLANE_TYPE_PRIMARY) {
+ switch (fourcc) {
+ case DRM_FORMAT_XRGB1555:
+ ctrl |= JZ_LCD_OSDCTRL_RGB555;
+ fallthrough;
+ case DRM_FORMAT_RGB565:
+ ctrl |= JZ_LCD_OSDCTRL_BPP_15_16;
+ break;
+ case DRM_FORMAT_XRGB8888:
+ ctrl |= JZ_LCD_OSDCTRL_BPP_18_24;
+ break;
+ }
+
+ regmap_update_bits(priv->map, JZ_REG_LCD_OSDCTRL,
+ JZ_LCD_OSDCTRL_BPP_MASK, ctrl);
+ } else {
+ switch (fourcc) {
+ case DRM_FORMAT_XRGB1555:
+ ctrl |= JZ_LCD_CTRL_RGB555;
+ fallthrough;
+ case DRM_FORMAT_RGB565:
+ ctrl |= JZ_LCD_CTRL_BPP_15_16;
+ break;
+ case DRM_FORMAT_XRGB8888:
+ ctrl |= JZ_LCD_CTRL_BPP_18_24;
+ break;
+ }
+
+ regmap_update_bits(priv->map, JZ_REG_LCD_CTRL,
+ JZ_LCD_CTRL_BPP_MASK, ctrl);
+ }
+
+ if (priv->soc_info->has_osd) {
+ if (plane->type == DRM_PLANE_TYPE_PRIMARY) {
+ xy_reg = JZ_REG_LCD_XYP1;
+ size_reg = JZ_REG_LCD_SIZE1;
+ } else {
+ xy_reg = JZ_REG_LCD_XYP0;
+ size_reg = JZ_REG_LCD_SIZE0;
+ }
+
+ regmap_write(priv->map, xy_reg,
+ state->crtc_x << JZ_LCD_XYP01_XPOS_LSB |
+ state->crtc_y << JZ_LCD_XYP01_YPOS_LSB);
+ regmap_write(priv->map, size_reg,
+ state->crtc_w << JZ_LCD_SIZE01_WIDTH_LSB |
+ state->crtc_h << JZ_LCD_SIZE01_HEIGHT_LSB);
+ }
+}
+
static void ingenic_drm_plane_atomic_update(struct drm_plane *plane,
struct drm_plane_state *oldstate)
{
- struct ingenic_drm *priv = drm_plane_get_priv(plane);
+ struct ingenic_drm *priv = drm_device_get_priv(plane->dev);
struct drm_plane_state *state = plane->state;
unsigned int width, height, cpp;
+ unsigned int hwdesc_idx;
dma_addr_t addr;

if (state && state->fb) {
@@ -274,9 +394,18 @@ static void ingenic_drm_plane_atomic_update(struct drm_plane *plane,
height = state->src_h >> 16;
cpp = state->fb->format->cpp[0];

- priv->dma_hwdesc->addr = addr;
- priv->dma_hwdesc->cmd = width * height * cpp / 4;
- priv->dma_hwdesc->cmd |= JZ_LCD_CMD_EOF_IRQ;
+ if (!priv->soc_info->has_osd)
+ hwdesc_idx = 0;
+ else

+ hwdesc_idx = plane->type == DRM_PLANE_TYPE_PRIMARY;

This looks ugly.
"plane->type == DRM_PLANE_TYPE_PRIMARY" evaluates to a boolean.
This is then ocnverted to an int used as index to an array later.
Something a bit more explicit would be more readable.

I'll come up with something better.

+
+ priv->dma_hwdesc[hwdesc_idx]->addr = addr;
+ priv->dma_hwdesc[hwdesc_idx]->cmd = width * height * cpp / 4;
+ priv->dma_hwdesc[hwdesc_idx]->cmd |= JZ_LCD_CMD_EOF_IRQ;
+
+ if (drm_atomic_crtc_needs_modeset(state->crtc->state))
+ ingenic_drm_plane_config(priv, plane,
+ state->fb->format->format);
}
}

@@ -437,6 +566,8 @@ static const struct drm_crtc_funcs ingenic_drm_crtc_funcs = {

static const struct drm_plane_helper_funcs ingenic_drm_plane_helper_funcs = {
.atomic_update = ingenic_drm_plane_atomic_update,
+ .atomic_check = ingenic_drm_plane_atomic_check,
+ .atomic_disable = ingenic_drm_plane_atomic_disable,
.prepare_fb = drm_gem_fb_prepare_fb,
};

@@ -463,8 +594,10 @@ static void ingenic_drm_free_dma_hwdesc(void *d)
{
struct ingenic_drm *priv = d;

- dma_free_coherent(priv->dev, sizeof(*priv->dma_hwdesc),
- priv->dma_hwdesc, priv->dma_hwdesc_phys);
+ dma_free_coherent(priv->dev, sizeof(*priv->dma_hwdesc[0]),
+ priv->dma_hwdesc[0], priv->dma_hwdesc_phys[0]);
+ dma_free_coherent(priv->dev, sizeof(*priv->dma_hwdesc[1]),
+ priv->dma_hwdesc[1], priv->dma_hwdesc_phys[1]);
}

static int ingenic_drm_probe(struct platform_device *pdev)
@@ -549,23 +682,32 @@ static int ingenic_drm_probe(struct platform_device *pdev)
bridge = devm_drm_panel_bridge_add_typed(dev, panel,
DRM_MODE_CONNECTOR_DPI);

- priv->dma_hwdesc = dma_alloc_coherent(dev, sizeof(*priv->dma_hwdesc),
- &priv->dma_hwdesc_phys,
- GFP_KERNEL);
- if (!priv->dma_hwdesc)
+ priv->dma_hwdesc[0] = dma_alloc_coherent(dev, sizeof(*priv->dma_hwdesc[0]),
+ &priv->dma_hwdesc_phys[0],
+ GFP_KERNEL);
+ if (!priv->dma_hwdesc[0])
+ return -ENOMEM;
+
+ priv->dma_hwdesc[0]->next = priv->dma_hwdesc_phys[0];
+ priv->dma_hwdesc[0]->id = 0xdeafbead;
+
+ priv->dma_hwdesc[1] = dma_alloc_coherent(dev, sizeof(*priv->dma_hwdesc[1]),
+ &priv->dma_hwdesc_phys[1],
+ GFP_KERNEL);
+ if (!priv->dma_hwdesc[1])
return -ENOMEM;

Here you should undo the first allocation??
I think the code could benefit from using dmam_alloc_coherent().

Right, good catch.

Thanks for the review!

Cheers,
-Paul

+ priv->dma_hwdesc[1]->next = priv->dma_hwdesc_phys[1];
+ priv->dma_hwdesc[1]->id = 0xdeadbabe;
+
ret = devm_add_action_or_reset(dev, ingenic_drm_free_dma_hwdesc, priv);
if (ret)
return ret;

- priv->dma_hwdesc->next = priv->dma_hwdesc_phys;
- priv->dma_hwdesc->id = 0xdeafbead;
-
- drm_plane_helper_add(&priv->primary, &ingenic_drm_plane_helper_funcs);
+ drm_plane_helper_add(&priv->f1, &ingenic_drm_plane_helper_funcs);

- ret = drm_universal_plane_init(drm, &priv->primary,
- 0, &ingenic_drm_primary_plane_funcs,
+ ret = drm_universal_plane_init(drm, &priv->f1, 1,
+ &ingenic_drm_primary_plane_funcs,
ingenic_drm_primary_formats,
ARRAY_SIZE(ingenic_drm_primary_formats),
NULL, DRM_PLANE_TYPE_PRIMARY, NULL);
@@ -576,13 +718,30 @@ static int ingenic_drm_probe(struct platform_device *pdev)

drm_crtc_helper_add(&priv->crtc, &ingenic_drm_crtc_helper_funcs);

- ret = drm_crtc_init_with_planes(drm, &priv->crtc, &priv->primary,
+ ret = drm_crtc_init_with_planes(drm, &priv->crtc, &priv->f1,
NULL, &ingenic_drm_crtc_funcs, NULL);
if (ret) {
dev_err(dev, "Failed to init CRTC: %i\n", ret);
return ret;
}

+ if (soc_info->has_osd) {
+ drm_plane_helper_add(&priv->f0,
+ &ingenic_drm_plane_helper_funcs);
+
+ ret = drm_universal_plane_init(drm, &priv->f0, 1,
+ &ingenic_drm_primary_plane_funcs,
+ ingenic_drm_primary_formats,
+ ARRAY_SIZE(ingenic_drm_primary_formats),
+ NULL, DRM_PLANE_TYPE_OVERLAY,
+ NULL);
+ if (ret) {
+ dev_err(dev, "Failed to register overlay plane: %i\n",
+ ret);
+ return ret;
+ }
+ }
+
priv->encoder.possible_crtcs = 1;

drm_encoder_helper_add(&priv->encoder,
@@ -644,7 +803,12 @@ static int ingenic_drm_probe(struct platform_device *pdev)
}

/* Set address of our DMA descriptor chain */
- regmap_write(priv->map, JZ_REG_LCD_DA0, priv->dma_hwdesc_phys);
+ regmap_write(priv->map, JZ_REG_LCD_DA0, priv->dma_hwdesc_phys[0]);
+ regmap_write(priv->map, JZ_REG_LCD_DA1, priv->dma_hwdesc_phys[1]);
+
+ /* Enable OSD if available */
+ if (soc_info->has_osd)
+ regmap_write(priv->map, JZ_REG_LCD_OSDC, JZ_LCD_OSDC_OSDEN);

ret = drm_dev_register(drm, 0);
if (ret) {
@@ -680,18 +844,21 @@ static int ingenic_drm_remove(struct platform_device *pdev)

static const struct jz_soc_info jz4740_soc_info = {
.needs_dev_clk = true,
+ .has_osd = false,
.max_width = 800,
.max_height = 600,
};

static const struct jz_soc_info jz4725b_soc_info = {
.needs_dev_clk = false,
+ .has_osd = true,
.max_width = 800,
.max_height = 600,
};

static const struct jz_soc_info jz4770_soc_info = {
.needs_dev_clk = false,
+ .has_osd = true,
.max_width = 1280,
.max_height = 720,
};
diff --git a/drivers/gpu/drm/ingenic/ingenic-drm.h b/drivers/gpu/drm/ingenic/ingenic-drm.h
index cb578cff7bb1..d0b827a9fe83 100644
--- a/drivers/gpu/drm/ingenic/ingenic-drm.h
+++ b/drivers/gpu/drm/ingenic/ingenic-drm.h
@@ -30,6 +30,18 @@
#define JZ_REG_LCD_SA1 0x54
#define JZ_REG_LCD_FID1 0x58
#define JZ_REG_LCD_CMD1 0x5C
+#define JZ_REG_LCD_OSDC 0x100
+#define JZ_REG_LCD_OSDCTRL 0x104
+#define JZ_REG_LCD_OSDS 0x108
+#define JZ_REG_LCD_BGC 0x10c
+#define JZ_REG_LCD_KEY0 0x110
+#define JZ_REG_LCD_KEY1 0x114
+#define JZ_REG_LCD_ALPHA 0x118
+#define JZ_REG_LCD_IPUR 0x11c
+#define JZ_REG_LCD_XYP0 0x120
+#define JZ_REG_LCD_XYP1 0x124
+#define JZ_REG_LCD_SIZE0 0x128
+#define JZ_REG_LCD_SIZE1 0x12c

#define JZ_LCD_CFG_SLCD BIT(31)
#define JZ_LCD_CFG_PS_DISABLE BIT(23)
@@ -123,4 +135,27 @@
#define JZ_LCD_STATE_SOF_IRQ BIT(4)
#define JZ_LCD_STATE_DISABLED BIT(0)

+#define JZ_LCD_OSDC_OSDEN BIT(0)
+#define JZ_LCD_OSDC_F0EN BIT(3)
+#define JZ_LCD_OSDC_F1EN BIT(4)
+
+#define JZ_LCD_OSDCTRL_IPU BIT(15)
+#define JZ_LCD_OSDCTRL_RGB555 BIT(4)
+#define JZ_LCD_OSDCTRL_CHANGE BIT(3)
+#define JZ_LCD_OSDCTRL_BPP_15_16 0x4
+#define JZ_LCD_OSDCTRL_BPP_18_24 0x5
+#define JZ_LCD_OSDCTRL_BPP_30 0x7
+#define JZ_LCD_OSDCTRL_BPP_MASK (JZ_LCD_OSDCTRL_RGB555 | 0x7)
+
+#define JZ_LCD_OSDS_READY BIT(0)
+
+#define JZ_LCD_IPUR_IPUREN BIT(31)
+#define JZ_LCD_IPUR_IPUR_LSB 0
+
+#define JZ_LCD_XYP01_XPOS_LSB 0
+#define JZ_LCD_XYP01_YPOS_LSB 16
+
+#define JZ_LCD_SIZE01_WIDTH_LSB 0
+#define JZ_LCD_SIZE01_HEIGHT_LSB 16
+
#endif /* DRIVERS_GPU_DRM_INGENIC_INGENIC_DRM_H */
--
2.27.0

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