[U-Boot] [PATCH v4 02/15] video: stm32: stm32_ltdc: add bridge to display controller
Yannick Fertré
yannick.fertre at st.com
Fri Sep 13 09:47:50 UTC 2019
Manage a bridge insert between the display controller & a panel.
Signed-off-by: Yannick Fertré <yannick.fertre at st.com>
---
drivers/video/stm32/stm32_ltdc.c | 143 +++++++++++++++++++++++----------------
1 file changed, 83 insertions(+), 60 deletions(-)
diff --git a/drivers/video/stm32/stm32_ltdc.c b/drivers/video/stm32/stm32_ltdc.c
index dc6c889..59ff692 100644
--- a/drivers/video/stm32/stm32_ltdc.c
+++ b/drivers/video/stm32/stm32_ltdc.c
@@ -7,19 +7,18 @@
#include <common.h>
#include <clk.h>
+#include <display.h>
#include <dm.h>
#include <panel.h>
#include <reset.h>
#include <video.h>
+#include <video_bridge.h>
#include <asm/io.h>
#include <asm/arch/gpio.h>
#include <dm/device-internal.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;
@@ -174,8 +173,8 @@ static u32 stm32_ltdc_get_pixel_format(enum video_log2_bpp l2bpp)
case VIDEO_BPP2:
case VIDEO_BPP4:
default:
- debug("%s: warning %dbpp not supported yet, %dbpp instead\n",
- __func__, VNBITS(l2bpp), VNBITS(VIDEO_BPP16));
+ pr_warn("%s: warning %dbpp not supported yet, %dbpp instead\n",
+ __func__, VNBITS(l2bpp), VNBITS(VIDEO_BPP16));
pf = PF_RGB565;
break;
}
@@ -209,23 +208,23 @@ 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;
@@ -247,14 +246,14 @@ 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);
@@ -330,96 +329,120 @@ 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;
+ struct udevice *bridge = NULL;
+ struct udevice *panel = NULL;
+ struct display_timing timings;
struct clk pclk;
struct reset_ctl rst;
- int rate, ret;
+ int ret;
priv->regs = (void *)dev_read_addr(dev);
if ((fdt_addr_t)priv->regs == FDT_ADDR_T_NONE) {
- debug("%s: ltdc dt register address error\n", __func__);
+ dev_err(dev, "ltdc dt register address error\n");
return -EINVAL;
}
ret = clk_get_by_index(dev, 0, &pclk);
if (ret) {
- debug("%s: peripheral clock get error %d\n", __func__, ret);
+ dev_err(dev, "peripheral clock get error %d\n", ret);
return ret;
}
ret = clk_enable(&pclk);
if (ret) {
- debug("%s: peripheral clock enable error %d\n",
- __func__, ret);
+ dev_err(dev, "peripheral clock enable error %d\n", ret);
return ret;
}
- ret = reset_get_by_index(dev, 0, &rst);
+ ret = uclass_first_device_err(UCLASS_PANEL, &panel);
if (ret) {
- debug("%s: missing ltdc hardware reset\n", __func__);
- return -ENODEV;
+ if (ret != -ENODEV)
+ dev_err(dev, "panel device error %d\n", ret);
+ return ret;
}
- /* Reset */
- reset_deassert(&rst);
-
- ret = uclass_first_device(UCLASS_PANEL, &panel);
+ ret = panel_get_display_timing(panel, &timings);
if (ret) {
- debug("%s: panel device error %d\n", __func__, ret);
- return ret;
+ ret = fdtdec_decode_display_timing(gd->fdt_blob,
+ dev_of_offset(panel),
+ 0, &timings);
+ if (ret) {
+ dev_err(dev, "decode display timing error %d\n", ret);
+ return ret;
+ }
}
- ret = panel_enable_backlight(panel);
+ ret = clk_set_rate(&pclk, timings.pixelclock.typ);
+ if (ret)
+ dev_warn(dev, "fail to set pixel clock %d hz\n",
+ timings.pixelclock.typ);
+
+ debug("%s: Set pixel clock req %d hz get %ld hz\n", __func__,
+ timings.pixelclock.typ, clk_get_rate(&pclk));
+
+ ret = reset_get_by_index(dev, 0, &rst);
if (ret) {
- debug("%s: panel %s enable backlight error %d\n",
- __func__, panel->name, ret);
+ dev_err(dev, "missing ltdc hardware reset\n");
return ret;
}
- ret = fdtdec_decode_display_timing(gd->fdt_blob,
- dev_of_offset(dev), 0,
- &priv->timing);
- if (ret) {
- debug("%s: decode display timing error %d\n",
- __func__, ret);
- return -EINVAL;
- }
+ /* Reset */
+ reset_deassert(&rst);
- rate = clk_set_rate(&pclk, priv->timing.pixelclock.typ);
- if (rate < 0) {
- debug("%s: fail to set pixel clock %d hz %d hz\n",
- __func__, priv->timing.pixelclock.typ, rate);
- return rate;
+ if (IS_ENABLED(CONFIG_VIDEO_BRIDGE)) {
+ ret = uclass_get_device(UCLASS_VIDEO_BRIDGE, 0, &bridge);
+ if (ret)
+ debug("No video bridge, or no backlight on bridge\n");
+
+ if (bridge) {
+ ret = video_bridge_attach(bridge);
+ if (ret) {
+ dev_err(dev, "fail to attach bridge\n");
+ return ret;
+ }
+ }
}
- debug("%s: Set pixel clock req %d hz get %d hz\n", __func__,
- priv->timing.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;
+ if (!bridge) {
+ ret = panel_enable_backlight(panel);
+ if (ret) {
+ dev_err(dev, "panel %s enable backlight error %d\n",
+ panel->name, ret);
+ return ret;
+ }
+ } else if (IS_ENABLED(CONFIG_VIDEO_BRIDGE)) {
+ ret = video_bridge_set_backlight(bridge, 80);
+ if (ret) {
+ dev_err(dev, "fail to set backlight\n");
+ return ret;
+ }
+ }
+
video_set_flush_dcache(dev, true);
return 0;
--
2.7.4
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