video: s3c-fb: add video clock running at data under-flow
This patch adds video clock running at data under-flow.
It means that the pixel clock is continuously provided
to lcd module, even when under-run occurs.
Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
diff --git a/drivers/video/s3c-fb.c b/drivers/video/s3c-fb.c
index 9af6c18..e22bf9d 100644
--- a/drivers/video/s3c-fb.c
+++ b/drivers/video/s3c-fb.c
@@ -84,6 +84,7 @@
* @has_shadowcon: Set if has SHADOWCON register.
* @has_blendcon: Set if has BLENDCON register.
* @has_clksel: Set if VIDCON0 register has CLKSEL bit.
+ * @has_fixvclk: Set if VIDCON1 register has FIXVCLK bits.
*/
struct s3c_fb_variant {
unsigned int is_2443:1;
@@ -103,6 +104,7 @@
unsigned int has_shadowcon:1;
unsigned int has_blendcon:1;
unsigned int has_clksel:1;
+ unsigned int has_fixvclk:1;
};
/**
@@ -1358,6 +1360,7 @@
struct resource *res;
int win;
int ret = 0;
+ u32 reg;
platid = platform_get_device_id(pdev);
fbdrv = (struct s3c_fb_driverdata *)platid->driver_data;
@@ -1448,6 +1451,14 @@
writel(pd->vidcon1, sfb->regs + VIDCON1);
+ /* set video clock running at under-run */
+ if (sfb->variant.has_fixvclk) {
+ reg = readl(sfb->regs + VIDCON1);
+ reg &= ~VIDCON1_VCLK_MASK;
+ reg |= VIDCON1_VCLK_RUN;
+ writel(reg, sfb->regs + VIDCON1);
+ }
+
/* zero all windows before we do anything */
for (win = 0; win < fbdrv->variant.nr_windows; win++)
@@ -1571,6 +1582,7 @@
struct s3c_fb_platdata *pd = sfb->pdata;
struct s3c_fb_win *win;
int win_no;
+ u32 reg;
clk_enable(sfb->bus_clk);
@@ -1581,6 +1593,14 @@
pd->setup_gpio();
writel(pd->vidcon1, sfb->regs + VIDCON1);
+ /* set video clock running at under-run */
+ if (sfb->variant.has_fixvclk) {
+ reg = readl(sfb->regs + VIDCON1);
+ reg &= ~VIDCON1_VCLK_MASK;
+ reg |= VIDCON1_VCLK_RUN;
+ writel(reg, sfb->regs + VIDCON1);
+ }
+
/* zero all windows before we do anything */
for (win_no = 0; win_no < sfb->variant.nr_windows; win_no++)
s3c_fb_clear_win(sfb, win_no);
@@ -1845,6 +1865,7 @@
.has_shadowcon = 1,
.has_blendcon = 1,
.has_clksel = 1,
+ .has_fixvclk = 1,
},
.win[0] = &s3c_fb_data_s5p_wins[0],
.win[1] = &s3c_fb_data_s5p_wins[1],
@@ -1876,6 +1897,7 @@
.has_shadowcon = 1,
.has_blendcon = 1,
+ .has_fixvclk = 1,
},
.win[0] = &s3c_fb_data_s5p_wins[0],
.win[1] = &s3c_fb_data_s5p_wins[1],
@@ -1941,6 +1963,7 @@
},
.has_blendcon = 1,
+ .has_fixvclk = 1,
},
.win[0] = &s3c_fb_data_s5p_wins[0],
.win[1] = &s3c_fb_data_s5p_wins[1],