[PATCH v2 22/22] drm: mxsfb: Support the alpha plane
Laurent Pinchart
laurent.pinchart at ideasonboard.com
Sat May 30 03:10:15 UTC 2020
The LCDIF in the i.MX6SX and i.MX7 have a second plane called the alpha
plane. Support it.
Signed-off-by: Laurent Pinchart <laurent.pinchart at ideasonboard.com>
---
Changes since v1:
- Split whitespace cleanup to a separate patch
---
drivers/gpu/drm/mxsfb/mxsfb_drv.c | 3 +
drivers/gpu/drm/mxsfb/mxsfb_drv.h | 6 +-
drivers/gpu/drm/mxsfb/mxsfb_kms.c | 129 +++++++++++++++++++++++++----
drivers/gpu/drm/mxsfb/mxsfb_regs.h | 22 +++++
4 files changed, 144 insertions(+), 16 deletions(-)
diff --git a/drivers/gpu/drm/mxsfb/mxsfb_drv.c b/drivers/gpu/drm/mxsfb/mxsfb_drv.c
index ed8e3f7bc27c..ab3a212375f1 100644
--- a/drivers/gpu/drm/mxsfb/mxsfb_drv.c
+++ b/drivers/gpu/drm/mxsfb/mxsfb_drv.c
@@ -49,6 +49,7 @@ static const struct mxsfb_devdata mxsfb_devdata[] = {
.next_buf = LCDC_V3_NEXT_BUF,
.hs_wdth_mask = 0xff,
.hs_wdth_shift = 24,
+ .has_overlay = false,
},
[MXSFB_V4] = {
.transfer_count = LCDC_V4_TRANSFER_COUNT,
@@ -56,6 +57,7 @@ static const struct mxsfb_devdata mxsfb_devdata[] = {
.next_buf = LCDC_V4_NEXT_BUF,
.hs_wdth_mask = 0x3fff,
.hs_wdth_shift = 18,
+ .has_overlay = false,
},
[MXSFB_V6] = {
.transfer_count = LCDC_V4_TRANSFER_COUNT,
@@ -63,6 +65,7 @@ static const struct mxsfb_devdata mxsfb_devdata[] = {
.next_buf = LCDC_V4_NEXT_BUF,
.hs_wdth_mask = 0x3fff,
.hs_wdth_shift = 18,
+ .has_overlay = true,
},
};
diff --git a/drivers/gpu/drm/mxsfb/mxsfb_drv.h b/drivers/gpu/drm/mxsfb/mxsfb_drv.h
index f883b56caed3..399d23e91ed1 100644
--- a/drivers/gpu/drm/mxsfb/mxsfb_drv.h
+++ b/drivers/gpu/drm/mxsfb/mxsfb_drv.h
@@ -21,6 +21,7 @@ struct mxsfb_devdata {
unsigned int next_buf;
unsigned int hs_wdth_mask;
unsigned int hs_wdth_shift;
+ bool has_overlay;
};
struct mxsfb_drm_private {
@@ -32,7 +33,10 @@ struct mxsfb_drm_private {
struct clk *clk_disp_axi;
struct drm_device *drm;
- struct drm_plane plane;
+ struct {
+ struct drm_plane primary;
+ struct drm_plane overlay;
+ } planes;
struct drm_crtc crtc;
struct drm_encoder encoder;
struct drm_connector *connector;
diff --git a/drivers/gpu/drm/mxsfb/mxsfb_kms.c b/drivers/gpu/drm/mxsfb/mxsfb_kms.c
index f81f8c222c13..c9c394f7cbe2 100644
--- a/drivers/gpu/drm/mxsfb/mxsfb_kms.c
+++ b/drivers/gpu/drm/mxsfb/mxsfb_kms.c
@@ -169,9 +169,9 @@ static int mxsfb_reset_block(struct mxsfb_drm_private *mxsfb)
return clear_poll_bit(mxsfb->base + LCDC_CTRL, CTRL_CLKGATE);
}
-static dma_addr_t mxsfb_get_fb_paddr(struct mxsfb_drm_private *mxsfb)
+static dma_addr_t mxsfb_get_fb_paddr(struct drm_plane *plane)
{
- struct drm_framebuffer *fb = mxsfb->plane.state->fb;
+ struct drm_framebuffer *fb = plane->state->fb;
struct drm_gem_cma_object *gem;
if (!fb)
@@ -206,6 +206,9 @@ static void mxsfb_crtc_mode_set_nofb(struct mxsfb_drm_private *mxsfb)
/* Clear the FIFOs */
writel(CTRL1_FIFO_CLEAR, mxsfb->base + LCDC_CTRL1 + REG_SET);
+ if (mxsfb->devdata->has_overlay)
+ writel(0, mxsfb->base + LCDC_AS_CTRL);
+
mxsfb_set_formats(mxsfb);
clk_set_rate(mxsfb->clk, m->crtc_clock * 1000);
@@ -313,7 +316,7 @@ static void mxsfb_crtc_atomic_enable(struct drm_crtc *crtc,
mxsfb_crtc_mode_set_nofb(mxsfb);
/* Write cur_buf as well to avoid an initial corrupt frame */
- paddr = mxsfb_get_fb_paddr(mxsfb);
+ paddr = mxsfb_get_fb_paddr(crtc->primary);
if (paddr) {
writel(paddr, mxsfb->base + mxsfb->devdata->cur_buf);
writel(paddr, mxsfb->base + mxsfb->devdata->next_buf);
@@ -410,20 +413,85 @@ static int mxsfb_plane_atomic_check(struct drm_plane *plane,
false, true);
}
-static void mxsfb_plane_atomic_update(struct drm_plane *plane,
- struct drm_plane_state *old_pstate)
+static void mxsfb_plane_primary_atomic_update(struct drm_plane *plane,
+ struct drm_plane_state *old_pstate)
{
struct mxsfb_drm_private *mxsfb = to_mxsfb_drm_private(plane->dev);
dma_addr_t paddr;
- paddr = mxsfb_get_fb_paddr(mxsfb);
+ paddr = mxsfb_get_fb_paddr(plane);
if (paddr)
writel(paddr, mxsfb->base + mxsfb->devdata->next_buf);
}
-static const struct drm_plane_helper_funcs mxsfb_plane_helper_funcs = {
+static void mxsfb_plane_overlay_atomic_update(struct drm_plane *plane,
+ struct drm_plane_state *old_pstate)
+{
+ struct mxsfb_drm_private *mxsfb = to_mxsfb_drm_private(plane->dev);
+ struct drm_plane_state *state = plane->state;
+ dma_addr_t paddr;
+ u32 ctrl;
+
+ paddr = mxsfb_get_fb_paddr(plane);
+ if (!paddr) {
+ writel(0, mxsfb->base + LCDC_AS_CTRL);
+ return;
+ }
+
+ /*
+ * HACK: The hardware seems to output 64 bytes of data of unknown
+ * origin, and then to proceed with the framebuffer. Until the reason
+ * is understood, live with the 16 initial invalid pixels on the first
+ * line and start 64 bytes within the framebuffer.
+ */
+ paddr += 64;
+
+ writel(paddr, mxsfb->base + LCDC_AS_NEXT_BUF);
+
+ /*
+ * If the plane was previously disabled, write LCDC_AS_BUF as well to
+ * provide the first buffer.
+ */
+ if (!old_pstate->fb)
+ writel(paddr, mxsfb->base + LCDC_AS_BUF);
+
+ ctrl = AS_CTRL_AS_ENABLE | AS_CTRL_ALPHA(255);
+
+ switch (state->fb->format->format) {
+ case DRM_FORMAT_XRGB4444:
+ ctrl |= AS_CTRL_FORMAT_RGB444 | AS_CTRL_ALPHA_CTRL_OVERRIDE;
+ break;
+ case DRM_FORMAT_ARGB4444:
+ ctrl |= AS_CTRL_FORMAT_ARGB4444 | AS_CTRL_ALPHA_CTRL_EMBEDDED;
+ break;
+ case DRM_FORMAT_XRGB1555:
+ ctrl |= AS_CTRL_FORMAT_RGB555 | AS_CTRL_ALPHA_CTRL_OVERRIDE;
+ break;
+ case DRM_FORMAT_ARGB1555:
+ ctrl |= AS_CTRL_FORMAT_ARGB1555 | AS_CTRL_ALPHA_CTRL_EMBEDDED;
+ break;
+ case DRM_FORMAT_RGB565:
+ ctrl |= AS_CTRL_FORMAT_RGB565 | AS_CTRL_ALPHA_CTRL_OVERRIDE;
+ break;
+ case DRM_FORMAT_XRGB8888:
+ ctrl |= AS_CTRL_FORMAT_RGB888 | AS_CTRL_ALPHA_CTRL_OVERRIDE;
+ break;
+ case DRM_FORMAT_ARGB8888:
+ ctrl |= AS_CTRL_FORMAT_ARGB8888 | AS_CTRL_ALPHA_CTRL_EMBEDDED;
+ break;
+ }
+
+ writel(ctrl, mxsfb->base + LCDC_AS_CTRL);
+}
+
+static const struct drm_plane_helper_funcs mxsfb_plane_primary_helper_funcs = {
.atomic_check = mxsfb_plane_atomic_check,
- .atomic_update = mxsfb_plane_atomic_update,
+ .atomic_update = mxsfb_plane_primary_atomic_update,
+};
+
+static const struct drm_plane_helper_funcs mxsfb_plane_overlay_helper_funcs = {
+ .atomic_check = mxsfb_plane_atomic_check,
+ .atomic_update = mxsfb_plane_overlay_atomic_update,
};
static const struct drm_plane_funcs mxsfb_plane_funcs = {
@@ -435,27 +503,58 @@ static const struct drm_plane_funcs mxsfb_plane_funcs = {
.atomic_destroy_state = drm_atomic_helper_plane_destroy_state,
};
-static const uint32_t mxsfb_formats[] = {
+static const uint32_t mxsfb_primary_plane_formats[] = {
+ DRM_FORMAT_RGB565,
DRM_FORMAT_XRGB8888,
- DRM_FORMAT_RGB565
};
+static const uint32_t mxsfb_overlay_plane_formats[] = {
+ DRM_FORMAT_XRGB4444,
+ DRM_FORMAT_ARGB4444,
+ DRM_FORMAT_XRGB1555,
+ DRM_FORMAT_ARGB1555,
+ DRM_FORMAT_RGB565,
+ DRM_FORMAT_XRGB8888,
+ DRM_FORMAT_ARGB8888,
+};
+
+/* -----------------------------------------------------------------------------
+ * Initialization
+ */
+
int mxsfb_kms_init(struct mxsfb_drm_private *mxsfb)
{
struct drm_encoder *encoder = &mxsfb->encoder;
- struct drm_plane *plane = &mxsfb->plane;
struct drm_crtc *crtc = &mxsfb->crtc;
int ret;
- drm_plane_helper_add(plane, &mxsfb_plane_helper_funcs);
- ret = drm_universal_plane_init(mxsfb->drm, plane, 0, &mxsfb_plane_funcs,
- mxsfb_formats, ARRAY_SIZE(mxsfb_formats),
+ drm_plane_helper_add(&mxsfb->planes.primary,
+ &mxsfb_plane_primary_helper_funcs);
+ ret = drm_universal_plane_init(mxsfb->drm, &mxsfb->planes.primary, 1,
+ &mxsfb_plane_funcs,
+ mxsfb_primary_plane_formats,
+ ARRAY_SIZE(mxsfb_primary_plane_formats),
NULL, DRM_PLANE_TYPE_PRIMARY, NULL);
if (ret)
return ret;
+ if (mxsfb->devdata->has_overlay) {
+ drm_plane_helper_add(&mxsfb->planes.overlay,
+ &mxsfb_plane_overlay_helper_funcs);
+ ret = drm_universal_plane_init(mxsfb->drm,
+ &mxsfb->planes.overlay, 1,
+ &mxsfb_plane_funcs,
+ mxsfb_overlay_plane_formats,
+ ARRAY_SIZE(mxsfb_overlay_plane_formats),
+ NULL, DRM_PLANE_TYPE_OVERLAY,
+ NULL);
+ if (ret)
+ return ret;
+ }
+
drm_crtc_helper_add(crtc, &mxsfb_crtc_helper_funcs);
- ret = drm_crtc_init_with_planes(mxsfb->drm, crtc, plane, NULL,
+ ret = drm_crtc_init_with_planes(mxsfb->drm, crtc,
+ &mxsfb->planes.primary, NULL,
&mxsfb_crtc_funcs, NULL);
if (ret)
return ret;
diff --git a/drivers/gpu/drm/mxsfb/mxsfb_regs.h b/drivers/gpu/drm/mxsfb/mxsfb_regs.h
index 8ebb52bb1b46..55d28a27f912 100644
--- a/drivers/gpu/drm/mxsfb/mxsfb_regs.h
+++ b/drivers/gpu/drm/mxsfb/mxsfb_regs.h
@@ -27,6 +27,11 @@
#define LCDC_VDCTRL4 0xb0
#define LCDC_V4_DEBUG0 0x1d0
#define LCDC_V3_DEBUG0 0x1f0
+#define LCDC_AS_CTRL 0x210
+#define LCDC_AS_BUF 0x220
+#define LCDC_AS_NEXT_BUF 0x230
+#define LCDC_AS_CLRKEYLOW 0x240
+#define LCDC_AS_CLRKEYHIGH 0x250
#define CTRL_SFTRST BIT(31)
#define CTRL_CLKGATE BIT(30)
@@ -90,6 +95,23 @@
#define DEBUG0_HSYNC BIT(26)
#define DEBUG0_VSYNC BIT(25)
+#define AS_CTRL_PS_DISABLE BIT(23)
+#define AS_CTRL_ALPHA_INVERT BIT(20)
+#define AS_CTRL_ALPHA(a) (((a) & 0xff) << 8)
+#define AS_CTRL_FORMAT_RGB565 (0xe << 4)
+#define AS_CTRL_FORMAT_RGB444 (0xd << 4)
+#define AS_CTRL_FORMAT_RGB555 (0xc << 4)
+#define AS_CTRL_FORMAT_ARGB4444 (0x9 << 4)
+#define AS_CTRL_FORMAT_ARGB1555 (0x8 << 4)
+#define AS_CTRL_FORMAT_RGB888 (0x4 << 4)
+#define AS_CTRL_FORMAT_ARGB8888 (0x0 << 4)
+#define AS_CTRL_ENABLE_COLORKEY BIT(3)
+#define AS_CTRL_ALPHA_CTRL_ROP (3 << 1)
+#define AS_CTRL_ALPHA_CTRL_MULTIPLY (2 << 1)
+#define AS_CTRL_ALPHA_CTRL_OVERRIDE (1 << 1)
+#define AS_CTRL_ALPHA_CTRL_EMBEDDED (0 << 1)
+#define AS_CTRL_AS_ENABLE BIT(0)
+
#define MXSFB_MIN_XRES 120
#define MXSFB_MIN_YRES 120
#define MXSFB_MAX_XRES 0xffff
--
Regards,
Laurent Pinchart
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