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mmc: sdhci-esdhc-imx: add tuning-step setting support 

tuning-step is the delay cell steps in tuning procedure. The default value
of tuning-step is 1. Some boards or cards need another value to pass the
tuning procedure. For example, imx7d-sdb board need the tuning-step value
as 2, otherwise it can't pass the tuning procedure.

So this patch add the tuning-step setting in driver, so that user can set
the tuning-step value in dts.

Signed-off-by: Haibo Chen <haibo.chen@freescale.com>
Acked-by: Dong Aisheng <aisheng.dong@freescale.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Haibo Chen 2015-08-11 19:38:27 +08:00 committed by Ulf Hansson
parent 28b07674f2
commit d407e30ba6
2 changed files with 10 additions and 0 deletions
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9
drivers/mmc/host/sdhci-esdhc-imx.c
View File

@ -75,6 +75,7 @@
#define ESDHC_STD_TUNING_EN (1 << 24)
/* NOTE: the minimum valid tuning start tap for mx6sl is 1 */
#define ESDHC_TUNING_START_TAP 0x1
#define ESDHC_TUNING_STEP_SHIFT 16
/* pinctrl state */
#define ESDHC_PINCTRL_STATE_100MHZ "state_100mhz"
@ -474,6 +475,7 @@ static void esdhc_writew_le(struct sdhci_host *host, u16 val, int reg)
} else if (imx_data->socdata->flags & ESDHC_FLAG_STD_TUNING) {
u32 v = readl(host->ioaddr + SDHCI_ACMD12_ERR);
u32 m = readl(host->ioaddr + ESDHC_MIX_CTRL);
u32 tuning_ctrl;
if (val & SDHCI_CTRL_TUNED_CLK) {
v |= ESDHC_MIX_CTRL_SMPCLK_SEL;
} else {
@ -484,6 +486,11 @@ static void esdhc_writew_le(struct sdhci_host *host, u16 val, int reg)
if (val & SDHCI_CTRL_EXEC_TUNING) {
v |= ESDHC_MIX_CTRL_EXE_TUNE;
m |= ESDHC_MIX_CTRL_FBCLK_SEL;
tuning_ctrl = readl(host->ioaddr + ESDHC_TUNING_CTRL);
tuning_ctrl |= ESDHC_STD_TUNING_EN | ESDHC_TUNING_START_TAP;
if (imx_data->boarddata.tuning_step)
tuning_ctrl |= imx_data->boarddata.tuning_step << ESDHC_TUNING_STEP_SHIFT;
writel(tuning_ctrl, host->ioaddr + ESDHC_TUNING_CTRL);
} else {
v &= ~ESDHC_MIX_CTRL_EXE_TUNE;
}
@ -963,6 +970,8 @@ sdhci_esdhc_imx_probe_dt(struct platform_device *pdev,
if (gpio_is_valid(boarddata->wp_gpio))
boarddata->wp_type = ESDHC_WP_GPIO;
of_property_read_u32(np, "fsl,tuning-step", &boarddata->tuning_step);
if (of_find_property(np, "no-1-8-v", NULL))
boarddata->support_vsel = false;
else

1
include/linux/platform_data/mmc-esdhc-imx.h
View File

@ -45,5 +45,6 @@ struct esdhc_platform_data {
int max_bus_width;
bool support_vsel;
unsigned int delay_line;
unsigned int tuning_step; /* The delay cell steps in tuning procedure */
};
#endif /* __ASM_ARCH_IMX_ESDHC_H */