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video: stm32: stm32_ltdc: set rate of the pixel clock

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pxclk is useless to set pixel clock.

Signed-off-by: yannick fertre <yannick.fertre@st.com>
This commit is contained in:
yannick fertre 2018-03-02 15:59:23 +01:00 committed by Anatolij Gustschin
parent c4c33e9d8b
commit 2a0e878460
1 changed files with 29 additions and 23 deletions
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52
drivers/video/stm32/stm32_ltdc.c
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@ -301,9 +301,9 @@ static int stm32_ltdc_probe(struct udevice *dev)
struct video_priv *uc_priv = dev_get_uclass_priv(dev);
struct stm32_ltdc_priv *priv = dev_get_priv(dev);
struct udevice *panel;
struct clk pclk, pxclk;
struct clk pclk;
struct reset_ctl rst;
int ret;
int rate, ret;
priv->regs = (void *)dev_read_addr(dev);
if ((fdt_addr_t)priv->regs == FDT_ADDR_T_NONE) {
@ -311,9 +311,16 @@ static int stm32_ltdc_probe(struct udevice *dev)
return -EINVAL;
}
ret = uclass_first_device(UCLASS_PANEL, &panel);
ret = clk_get_by_index(dev, 0, &pclk);
if (ret) {
debug("%s: panel device error %d\n", __func__, ret);
debug("%s: peripheral clock get error %d\n", __func__, ret);
return ret;
}
ret = clk_enable(&pclk);
if (ret) {
debug("%s: peripheral clock enable error %d\n",
__func__, ret);
return ret;
}
@ -326,6 +333,12 @@ static int stm32_ltdc_probe(struct udevice *dev)
/* Reset */
reset_deassert(&rst);
ret = uclass_first_device(UCLASS_PANEL, &panel);
if (ret) {
debug("%s: panel device error %d\n", __func__, ret);
return ret;
}
ret = panel_enable_backlight(panel);
if (ret) {
debug("%s: panel %s enable backlight error %d\n",
@ -333,31 +346,24 @@ static int stm32_ltdc_probe(struct udevice *dev)
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(dev), 0,
&priv->timing);
if (ret) {
debug("%s: decode display timing error %d\n", __func__, ret);
debug("%s: decode display timing error %d\n",
__func__, ret);
return -EINVAL;
}
ret = clk_get_by_name(dev, "pclk", &pclk);
if (ret) {
debug("%s: peripheral clock get error %d\n", __func__, ret);
return ret;
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;
}
ret = clk_enable(&pclk);
if (ret) {
debug("%s: peripheral clock enable error %d\n", __func__, ret);
return ret;
}
/* Verify pixel clock value if any & inform user accordingly */
ret = clk_get_by_name(dev, "pxclk", &pxclk);
if (!ret) {
if (clk_get_rate(&pxclk) != priv->timing.pixelclock.typ)
printf("Warning: please adjust ltdc pixel clock\n");
}
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;