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Subject[PATCH v3 01/10] video: stm32: stm32_ltdc: add bridge to display controller
Date
Manage a bridge insert between the display controller & a panel.

Signed-off-by: yannick fertre <yannick.fertre@st.com>
---
drivers/video/stm32/stm32_ltdc.c | 107 ++++++++++++++++++++++++++-------------
1 file changed, 71 insertions(+), 36 deletions(-)

diff --git a/drivers/video/stm32/stm32_ltdc.c b/drivers/video/stm32/stm32_ltdc.c
index e160c77..bd9c0de 100644
--- a/drivers/video/stm32/stm32_ltdc.c
+++ b/drivers/video/stm32/stm32_ltdc.c
@@ -8,6 +8,7 @@

#include <common.h>
#include <clk.h>
+#include <display.h>
#include <dm.h>
#include <panel.h>
#include <reset.h>
@@ -15,12 +16,12 @@
#include <asm/io.h>
#include <asm/arch/gpio.h>
#include <dm/device-internal.h>
+#include <video_bridge.h>

DECLARE_GLOBAL_DATA_PTR;

struct stm32_ltdc_priv {
void __iomem *regs;
- struct display_timing timing;
enum video_log2_bpp l2bpp;
u32 bg_col_argb;
u32 crop_x, crop_y, crop_w, crop_h;
@@ -210,23 +211,23 @@ static void stm32_ltdc_enable(struct stm32_ltdc_priv *priv)
setbits_le32(priv->regs + LTDC_GCR, GCR_LTDCEN);
}

-static void stm32_ltdc_set_mode(struct stm32_ltdc_priv *priv)
+static void stm32_ltdc_set_mode(struct stm32_ltdc_priv *priv,
+ struct display_timing *timings)
{
void __iomem *regs = priv->regs;
- struct display_timing *timing = &priv->timing;
u32 hsync, vsync, acc_hbp, acc_vbp, acc_act_w, acc_act_h;
u32 total_w, total_h;
u32 val;

/* Convert video timings to ltdc timings */
- hsync = timing->hsync_len.typ - 1;
- vsync = timing->vsync_len.typ - 1;
- acc_hbp = hsync + timing->hback_porch.typ;
- acc_vbp = vsync + timing->vback_porch.typ;
- acc_act_w = acc_hbp + timing->hactive.typ;
- acc_act_h = acc_vbp + timing->vactive.typ;
- total_w = acc_act_w + timing->hfront_porch.typ;
- total_h = acc_act_h + timing->vfront_porch.typ;
+ hsync = timings->hsync_len.typ - 1;
+ vsync = timings->vsync_len.typ - 1;
+ acc_hbp = hsync + timings->hback_porch.typ;
+ acc_vbp = vsync + timings->vback_porch.typ;
+ acc_act_w = acc_hbp + timings->hactive.typ;
+ acc_act_h = acc_vbp + timings->vactive.typ;
+ total_w = acc_act_w + timings->hfront_porch.typ;
+ total_h = acc_act_h + timings->vfront_porch.typ;

/* Synchronization sizes */
val = (hsync << 16) | vsync;
@@ -248,14 +249,14 @@ static void stm32_ltdc_set_mode(struct stm32_ltdc_priv *priv)

/* Signal polarities */
val = 0;
- debug("%s: timing->flags 0x%08x\n", __func__, timing->flags);
- if (timing->flags & DISPLAY_FLAGS_HSYNC_HIGH)
+ debug("%s: timing->flags 0x%08x\n", __func__, timings->flags);
+ if (timings->flags & DISPLAY_FLAGS_HSYNC_HIGH)
val |= GCR_HSPOL;
- if (timing->flags & DISPLAY_FLAGS_VSYNC_HIGH)
+ if (timings->flags & DISPLAY_FLAGS_VSYNC_HIGH)
val |= GCR_VSPOL;
- if (timing->flags & DISPLAY_FLAGS_DE_HIGH)
+ if (timings->flags & DISPLAY_FLAGS_DE_HIGH)
val |= GCR_DEPOL;
- if (timing->flags & DISPLAY_FLAGS_PIXDATA_NEGEDGE)
+ if (timings->flags & DISPLAY_FLAGS_PIXDATA_NEGEDGE)
val |= GCR_PCPOL;
clrsetbits_le32(regs + LTDC_GCR,
GCR_HSPOL | GCR_VSPOL | GCR_DEPOL | GCR_PCPOL, val);
@@ -331,7 +332,11 @@ static int stm32_ltdc_probe(struct udevice *dev)
struct video_uc_platdata *uc_plat = dev_get_uclass_platdata(dev);
struct video_priv *uc_priv = dev_get_uclass_priv(dev);
struct stm32_ltdc_priv *priv = dev_get_priv(dev);
- struct udevice *panel;
+#ifdef CONFIG_VIDEO_BRIDGE
+ struct udevice *bridge = NULL;
+#endif
+ struct udevice *panel = NULL;
+ struct display_timing timings;
struct clk pclk;
struct reset_ctl rst;
int rate, ret;
@@ -364,63 +369,93 @@ static int stm32_ltdc_probe(struct udevice *dev)
/* Reset */
reset_deassert(&rst);

- ret = uclass_first_device(UCLASS_PANEL, &panel);
+#ifdef CONFIG_VIDEO_BRIDGE
+ ret = uclass_get_device(UCLASS_VIDEO_BRIDGE, 0, &bridge);
if (ret) {
- debug("%s: panel device error %d\n", __func__, ret);
- return ret;
+ debug("%s: No video bridge, or no backlight on bridge\n",
+ __func__);
}

- ret = panel_enable_backlight(panel);
+ if (bridge) {
+ ret = video_bridge_attach(bridge);
+ if (ret) {
+ debug("%s: fail to attach bridge\n", __func__);
+ return ret;
+ }
+ }
+#endif
+ ret = uclass_first_device(UCLASS_PANEL, &panel);
if (ret) {
- debug("%s: panel %s enable backlight error %d\n",
- __func__, panel->name, ret);
+ debug("%s: panel device error %d\n", __func__, ret);
return ret;
}

- ret = fdtdec_decode_display_timing(gd->fdt_blob,
- dev_of_offset(dev), 0,
- &priv->timing);
+ ret = fdtdec_decode_display_timing(gd->fdt_blob, dev_of_offset(panel),
+ 0, &timings);
if (ret) {
debug("%s: decode display timing error %d\n",
__func__, ret);
- return -EINVAL;
+ return ret;
}

- rate = clk_set_rate(&pclk, priv->timing.pixelclock.typ);
+ rate = clk_set_rate(&pclk, timings.pixelclock.typ);
if (rate < 0) {
debug("%s: fail to set pixel clock %d hz %d hz\n",
- __func__, priv->timing.pixelclock.typ, rate);
+ __func__, timings.pixelclock.typ, rate);
return rate;
}

debug("%s: Set pixel clock req %d hz get %d hz\n", __func__,
- priv->timing.pixelclock.typ, rate);
+ timings.pixelclock.typ, rate);

/* TODO Below parameters are hard-coded for the moment... */
priv->l2bpp = VIDEO_BPP16;
priv->bg_col_argb = 0xFFFFFFFF; /* white no transparency */
priv->crop_x = 0;
priv->crop_y = 0;
- priv->crop_w = priv->timing.hactive.typ;
- priv->crop_h = priv->timing.vactive.typ;
+ priv->crop_w = timings.hactive.typ;
+ priv->crop_h = timings.vactive.typ;
priv->alpha = 0xFF;

debug("%s: %dx%d %dbpp frame buffer at 0x%lx\n", __func__,
- priv->timing.hactive.typ, priv->timing.vactive.typ,
+ timings.hactive.typ, timings.vactive.typ,
VNBITS(priv->l2bpp), uc_plat->base);
debug("%s: crop %d,%d %dx%d bg 0x%08x alpha %d\n", __func__,
priv->crop_x, priv->crop_y, priv->crop_w, priv->crop_h,
priv->bg_col_argb, priv->alpha);

/* Configure & start LTDC */
- stm32_ltdc_set_mode(priv);
+ stm32_ltdc_set_mode(priv, &timings);
stm32_ltdc_set_layer1(priv, uc_plat->base);
stm32_ltdc_enable(priv);

- uc_priv->xsize = priv->timing.hactive.typ;
- uc_priv->ysize = priv->timing.vactive.typ;
+ uc_priv->xsize = timings.hactive.typ;
+ uc_priv->ysize = timings.vactive.typ;
uc_priv->bpix = priv->l2bpp;

+#ifdef CONFIG_VIDEO_BRIDGE
+ if (bridge) {
+ ret = video_bridge_set_backlight(bridge, 80);
+ if (ret) {
+ debug("%s: fail to set backlight\n", __func__);
+ return ret;
+ }
+ } else {
+ ret = panel_enable_backlight(panel);
+ if (ret) {
+ debug("%s: panel %s enable backlight error %d\n",
+ __func__, panel->name, ret);
+ return ret;
+ }
+ }
+#else
+ ret = panel_enable_backlight(panel);
+ if (ret) {
+ debug("%s: panel %s enable backlight error %d\n",
+ __func__, panel->name, ret);
+ return ret;
+ }
+#endif
video_set_flush_dcache(dev, true);

return 0;
--
1.9.1
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