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mmc: sdhci-esdhc-imx: support setting tuning start point

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The delay cells of some SoCs may have less delay per one cell,
for such SoCs, user could set the start delay cell point to bypass
the first a few meaningless tuning commands.

Acked-by: Adrian Hunter <[email protected]>
Signed-off-by: Dong Aisheng <[email protected]>
Signed-off-by: Ulf Hansson <[email protected]>
This commit is contained in:
Dong Aisheng 2016-07-12 15:46:15 +08:00 • committed by Ulf Hansson
commit d87fc96636
2 changed files with 12 additions and 3 deletions
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14
drivers/mmc/host/sdhci-esdhc-imx.c
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@ -76,7 +76,8 @@
#define ESDHC_TUNING_CTRL 0xcc
#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_START_TAP_DEFAULT 0x1
#define ESDHC_TUNING_START_TAP_MASK 0xff
#define ESDHC_TUNING_STEP_MASK 0x00070000
#define ESDHC_TUNING_STEP_SHIFT 16
@ -490,7 +491,12 @@ static void esdhc_writew_le(struct sdhci_host *host, u16 val, int reg)
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;
tuning_ctrl |= ESDHC_STD_TUNING_EN | ESDHC_TUNING_START_TAP_DEFAULT;
if (imx_data->boarddata.tuning_start_tap) {
tuning_ctrl &= ~ESDHC_TUNING_START_TAP_MASK;
tuning_ctrl |= imx_data->boarddata.tuning_start_tap;
}
if (imx_data->boarddata.tuning_step) {
tuning_ctrl &= ~ESDHC_TUNING_STEP_MASK;
tuning_ctrl |= imx_data->boarddata.tuning_step << ESDHC_TUNING_STEP_SHIFT;
@ -976,6 +982,8 @@ sdhci_esdhc_imx_probe_dt(struct platform_device *pdev,
boarddata->wp_type = ESDHC_WP_GPIO;
of_property_read_u32(np, "fsl,tuning-step", &boarddata->tuning_step);
of_property_read_u32(np, "fsl,tuning-start-tap",
&boarddata->tuning_start_tap);
if (of_find_property(np, "no-1-8-v", NULL))
boarddata->support_vsel = false;
@ -1198,7 +1206,7 @@ static int sdhci_esdhc_imx_probe(struct platform_device *pdev)
if (imx_data->socdata->flags & ESDHC_FLAG_STD_TUNING)
writel(readl(host->ioaddr + ESDHC_TUNING_CTRL) |
ESDHC_STD_TUNING_EN | ESDHC_TUNING_START_TAP,
ESDHC_STD_TUNING_EN | ESDHC_TUNING_START_TAP_DEFAULT,
host->ioaddr + ESDHC_TUNING_CTRL);
if (imx_data->socdata->flags & ESDHC_FLAG_ERR004536)