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Subject[PATCH v3 1/1] drm/ingenic: Add support for paletted 8bpp
Date
On JZ4725B and newer, the F0 plane supports paletted 8bpp with a
256-entry palette. Add support for it.

v3: Only accept a full 256-entry palette.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
---
drivers/gpu/drm/ingenic/ingenic-drm-drv.c | 66 +++++++++++++++++++++--
1 file changed, 62 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/ingenic/ingenic-drm-drv.c b/drivers/gpu/drm/ingenic/ingenic-drm-drv.c
index 589fc0c60716..0225dc1f5eb8 100644
--- a/drivers/gpu/drm/ingenic/ingenic-drm-drv.c
+++ b/drivers/gpu/drm/ingenic/ingenic-drm-drv.c
@@ -21,6 +21,7 @@
#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_bridge.h>
+#include <drm/drm_color_mgmt.h>
#include <drm/drm_crtc.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_damage_helper.h>
@@ -50,6 +51,8 @@ struct ingenic_dma_hwdesc {
struct ingenic_dma_hwdescs {
struct ingenic_dma_hwdesc hwdesc_f0;
struct ingenic_dma_hwdesc hwdesc_f1;
+ struct ingenic_dma_hwdesc hwdesc_pal;
+ u16 palette[256] __aligned(16);
};

struct jz_soc_info {
@@ -249,6 +252,12 @@ static int ingenic_drm_crtc_atomic_check(struct drm_crtc *crtc,
struct ingenic_drm *priv = drm_crtc_get_priv(crtc);
struct drm_plane_state *f1_state, *f0_state, *ipu_state = NULL;

+ if (state->gamma_lut &&
+ drm_color_lut_size(state->gamma_lut) != ARRAY_SIZE(priv->dma_hwdescs->palette)) {
+ dev_dbg(priv->dev, "Invalid palette size\n");
+ return -EINVAL;
+ }
+
if (drm_atomic_crtc_needs_modeset(state) && priv->soc_info->has_osd) {
f1_state = drm_atomic_get_plane_state(state->state, &priv->f1);
if (IS_ERR(f1_state))
@@ -470,6 +479,9 @@ void ingenic_drm_plane_config(struct device *dev,
JZ_LCD_OSDCTRL_BPP_MASK, ctrl);
} else {
switch (fourcc) {
+ case DRM_FORMAT_C8:
+ ctrl |= JZ_LCD_CTRL_BPP_8;
+ break;
case DRM_FORMAT_XRGB1555:
ctrl |= JZ_LCD_CTRL_RGB555;
fallthrough;
@@ -541,16 +553,34 @@ void ingenic_drm_sync_data(struct device *dev,
}
}

+static void ingenic_drm_update_palette(struct ingenic_drm *priv,
+ const struct drm_color_lut *lut)
+{
+ unsigned int i;
+
+ for (i = 0; i < ARRAY_SIZE(priv->dma_hwdescs->palette); i++) {
+ u16 color = drm_color_lut_extract(lut[i].red, 5) << 11
+ | drm_color_lut_extract(lut[i].green, 6) << 5
+ | drm_color_lut_extract(lut[i].blue, 5);
+
+ priv->dma_hwdescs->palette[i] = color;
+ }
+}
+
static void ingenic_drm_plane_atomic_update(struct drm_plane *plane,
struct drm_plane_state *oldstate)
{
struct ingenic_drm *priv = drm_device_get_priv(plane->dev);
struct drm_plane_state *state = plane->state;
+ struct drm_crtc_state *crtc_state;
struct ingenic_dma_hwdesc *hwdesc;
- unsigned int width, height, cpp;
+ unsigned int width, height, cpp, offset;
dma_addr_t addr;
+ u32 fourcc;

if (state && state->fb) {
+ crtc_state = state->crtc->state;
+
ingenic_drm_sync_data(priv->dev, oldstate, state);

addr = drm_fb_cma_get_gem_addr(state->fb, state, 0);
@@ -566,9 +596,23 @@ static void ingenic_drm_plane_atomic_update(struct drm_plane *plane,
hwdesc->addr = addr;
hwdesc->cmd = JZ_LCD_CMD_EOF_IRQ | (width * height * cpp / 4);

- if (drm_atomic_crtc_needs_modeset(state->crtc->state))
- ingenic_drm_plane_config(priv->dev, plane,
- state->fb->format->format);
+ if (drm_atomic_crtc_needs_modeset(crtc_state)) {
+ fourcc = state->fb->format->format;
+
+ ingenic_drm_plane_config(priv->dev, plane, fourcc);
+
+ if (fourcc == DRM_FORMAT_C8)
+ offset = offsetof(struct ingenic_dma_hwdescs, hwdesc_pal);
+ else
+ offset = offsetof(struct ingenic_dma_hwdescs, hwdesc_f0);
+
+ priv->dma_hwdescs->hwdesc_f0.next = priv->dma_hwdescs_phys + offset;
+
+ crtc_state->color_mgmt_changed = fourcc == DRM_FORMAT_C8;
+ }
+
+ if (crtc_state->color_mgmt_changed)
+ ingenic_drm_update_palette(priv, crtc_state->gamma_lut->data);
}
}

@@ -964,6 +1008,15 @@ static int ingenic_drm_bind(struct device *dev, bool has_components)
priv->dma_hwdescs->hwdesc_f1.next = dma_hwdesc_phys_f1;
priv->dma_hwdescs->hwdesc_f1.id = 0xf1;

+ /* Configure DMA hwdesc for palette */
+ priv->dma_hwdescs->hwdesc_pal.next = priv->dma_hwdescs_phys
+ + offsetof(struct ingenic_dma_hwdescs, hwdesc_f0);
+ priv->dma_hwdescs->hwdesc_pal.id = 0xc0;
+ priv->dma_hwdescs->hwdesc_pal.addr = priv->dma_hwdescs_phys
+ + offsetof(struct ingenic_dma_hwdescs, palette);
+ priv->dma_hwdescs->hwdesc_pal.cmd = JZ_LCD_CMD_ENABLE_PAL
+ | (sizeof(priv->dma_hwdescs->palette) / 4);
+
if (soc_info->has_osd)
priv->ipu_plane = drm_plane_from_index(drm, 0);

@@ -990,6 +1043,9 @@ static int ingenic_drm_bind(struct device *dev, bool has_components)
return ret;
}

+ drm_crtc_enable_color_mgmt(&priv->crtc, 0, false,
+ ARRAY_SIZE(priv->dma_hwdescs->palette));
+
if (soc_info->has_osd) {
drm_plane_helper_add(&priv->f0,
&ingenic_drm_plane_helper_funcs);
@@ -1225,6 +1281,7 @@ static const u32 jz4725b_formats_f1[] = {
};

static const u32 jz4725b_formats_f0[] = {
+ DRM_FORMAT_C8,
DRM_FORMAT_XRGB1555,
DRM_FORMAT_RGB565,
DRM_FORMAT_XRGB8888,
@@ -1239,6 +1296,7 @@ static const u32 jz4770_formats_f1[] = {
};

static const u32 jz4770_formats_f0[] = {
+ DRM_FORMAT_C8,
DRM_FORMAT_XRGB1555,
DRM_FORMAT_RGB565,
DRM_FORMAT_RGB888,
--
2.28.0
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