On 2 April 2012 11:22, Donghwa Lee dh09.lee@samsung.com wrote:

To get lcd clock in EXYNOS display driver, added get_lcd_clk() interface.

Signed-off-by: Donghwa Lee dh09.lee@samsung.com Signed-off-by: Inki Dae inki.dae@samsung.com Signed-off-by: Kyungmin Park kyungmin.park@samsung.com

---

arch/arm/cpu/armv7/exynos/clock.c |   72 +++++++++++++++++++++++++++++++++++++  1 files changed, 72 insertions(+), 0 deletions(-)

diff --git a/arch/arm/cpu/armv7/exynos/clock.c b/arch/arm/cpu/armv7/exynos/clock.c index 2f7048b..b13fba3 100644 --- a/arch/arm/cpu/armv7/exynos/clock.c +++ b/arch/arm/cpu/armv7/exynos/clock.c @@ -414,6 +414,66 @@ static void exynos5_set_mmc_clk(int dev_index, unsigned int div)        writel(val, addr);  }

+/* get_lcd_clk: return lcd clock frequency */ +static unsigned long exynos4_get_lcd_clk(void) +{

• struct exynos4_clock *clk =
• (struct exynos4_clock *)samsung_get_base_clock();
• unsigned long pclk, sclk;
• unsigned int sel;
• unsigned int ratio;
• /*
• * CLK_SRC_LCD0
• * FIMD0_SEL [3:0]
• */
• sel = readl(&clk->src_lcd0);
• sel = sel & 0xf;
• if (sel == 0x6)
• sclk = get_pll_clk(MPLL);
• else if (sel == 0x7)
• sclk = get_pll_clk(EPLL);
• else if (sel == 0x8)
• sclk = get_pll_clk(VPLL);
• else
• return 0;
• /*
• * CLK_DIV_LCD0
• * FIMD0_RATIO [3:0]
• */
• ratio = readl(&clk->div_lcd0);
• ratio = ratio & 0xf;
• pclk = sclk / (ratio + 1);
• return pclk;

+}

+static unsigned long exynos4_set_lcd_clk(void) +{

• struct exynos4_clock *clk =
• (struct exynos4_clock *)samsung_get_base_clock();
• unsigned int cfg = 0;
• /* set lcd src clock */
• cfg = readl(&clk->src_lcd0);
• cfg &= ~(0xf);
• cfg |= 0x6;

what is 0x6?

• writel(cfg, &clk->src_lcd0);
• cfg = readl(&clk->gate_ip_lcd0);
• cfg |= 1 << 0;
• writel(cfg, &clk->gate_ip_lcd0);
• /* set fimd ratio */
• cfg &= ~(0xf);
• cfg |= 0x1;

what is 0x1?

• writel(cfg, &clk->div_lcd0);

+}

unsigned long get_pll_clk(int pllreg)  {        if (cpu_is_exynos5()) @@ -453,3 +513,15 @@ void set_mmc_clk(int dev_index, unsigned int div)        else                exynos4_set_mmc_clk(dev_index, div);  }

+unsigned long get_lcd_clk(void) +{

• if (cpu_is_exynos4())
• return exynos4_get_lcd_clk();

need return.

+}

+unsigned long set_lcd_clk(void)

This function should be void function.

+{

• if (cpu_is_exynos4())
• return exynos4_set_lcd_clk();

+}

Thanks, Minkyu Kang.