Hi Rajesh,
I guess we wait for an updated patch here?
Regards
-- Pantelis
On Sep 11, 2013, at 4:25 PM, Rajeshwari Birje wrote:
Hi Jaehoon Chung,
Thank you for comments,
On Wed, Sep 11, 2013 at 11:31 AM, Jaehoon Chung jh80.chung@samsung.com wrote:
On 09/11/2013 02:28 PM, Rajeshwari Birje wrote:
Hi All,
Please do let me know if any comments on the same.
Regards, Rajeshwari Shinde.
On Thu, Aug 29, 2013 at 4:34 PM, Rajeshwari Birje rajeshwari.birje@gmail.com wrote:
CCing the MMC Maintainer.
On Thu, Aug 29, 2013 at 4:22 PM, Rajeshwari S Shinde rajeshwari.s@samsung.com wrote:
This patch corrects the divider value written to CLKDIV register. Since SDCLKIN is divided inside controller by the DIVRATIO value set in the CLKSEL register, we need to use the same output clock value to calculate the CLKDIV value. as per user manual: cclk_in = SDCLKIN / (DIVRATIO + 1)
Input parameter to mmc_clk is changed to dwmci_host, since we need the same to read DWMCI_CLKSEL register.
This improves the read timing values for channel 0 on SMDK5250 from 0.288sec to 0.144sec
Signed-off-by: Rajeshwari S Shinde rajeshwari.s@samsung.com
arch/arm/include/asm/arch-exynos/dwmmc.h | 4 ++++ drivers/mmc/dw_mmc.c | 2 +- drivers/mmc/exynos_dw_mmc.c | 17 +++++++++++++++-- include/dwmmc.h | 2 +- 4 files changed, 21 insertions(+), 4 deletions(-)
diff --git a/arch/arm/include/asm/arch-exynos/dwmmc.h b/arch/arm/include/asm/arch-exynos/dwmmc.h index b9eca76..f1c8d8a 100644 --- a/arch/arm/include/asm/arch-exynos/dwmmc.h +++ b/arch/arm/include/asm/arch-exynos/dwmmc.h @@ -14,6 +14,10 @@ #define DWMCI_SET_DRV_CLK(x) ((x) << 16) #define DWMCI_SET_DIV_RATIO(x) ((x) << 24)
+/* CLKSEL Register */ +#define DWMCI_DIVRATIO_BIT 24 +#define DWMCI_DIVRATIO_MASK 0x7
#ifdef CONFIG_OF_CONTROL int exynos_dwmmc_init(const void *blob); #endif diff --git a/drivers/mmc/dw_mmc.c b/drivers/mmc/dw_mmc.c index a82ee17..3406bdd 100644 --- a/drivers/mmc/dw_mmc.c +++ b/drivers/mmc/dw_mmc.c @@ -224,7 +224,7 @@ static int dwmci_setup_bus(struct dwmci_host *host, u32 freq) * host->bus_hz should be set from user. */ if (host->mmc_clk)
sclk = host->mmc_clk(host->dev_index);
sclk = host->mmc_clk(host); else if (host->bus_hz) sclk = host->bus_hz; else {diff --git a/drivers/mmc/exynos_dw_mmc.c b/drivers/mmc/exynos_dw_mmc.c index 4ef9fec..1ed4afe 100644 --- a/drivers/mmc/exynos_dw_mmc.c +++ b/drivers/mmc/exynos_dw_mmc.c @@ -29,9 +29,22 @@ static void exynos_dwmci_clksel(struct dwmci_host *host) dwmci_writel(host, DWMCI_CLKSEL, host->clksel_val); }
-unsigned int exynos_dwmci_get_clk(int dev_index) +unsigned int exynos_dwmci_get_clk(struct dwmci_host *host) {
return get_mmc_clk(dev_index);
unsigned long sclk;int8_t clk_div;/** Since SDCLKIN is divided inside controller by the DIVRATIO* value set in the CLKSEL register, we need to use the same output* clock value to calculate the CLKDIV value.* as per user manual:cclk_in = SDCLKIN / (DIVRATIO + 1)*/clk_div = ((dwmci_readl(host, DWMCI_CLKSEL) >> DWMCI_DIVRATIO_BIT)& DWMCI_DIVRATIO_MASK) + 1;I known DIVRATIO is only exynos5 feature.. And If clk_div is set to 0, then clk_phase/clk_strength is also set to 0.
And I think we can fixed this problem into exynos_dwmci_add_port.
Best Regards, Jaehoon Chung
during the dwmci_setup_bus we call for mmc_clk, this is where the get_mmc_clk(host->dev_index) retruns you the parent clock but since we need the output of mux " cclk_in", added in the exynos_dwmci_get_clk. -- Regards, Rajeshwari Shinde
sclk = get_mmc_clk(host->dev_index);return sclk / clk_div;}
/* diff --git a/include/dwmmc.h b/include/dwmmc.h index 08ced0b..26b53af 100644 --- a/include/dwmmc.h +++ b/include/dwmmc.h @@ -138,7 +138,7 @@ struct dwmci_host { struct mmc *mmc;
void (*clksel)(struct dwmci_host *host);
unsigned int (*mmc_clk)(int dev_index);
unsigned int (*mmc_clk)(struct dwmci_host *host);};
struct dwmci_idmac {
1.7.12.4
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-- Regards, Rajeshwari Shinde