diff options
| author | Haibo Chen <haibo.chen@nxp.com> | 2017-09-15 19:48:14 +0800 |
|---|---|---|
| committer | Jason Liu <jason.hui.liu@nxp.com> | 2019-02-12 10:28:30 +0800 |
| commit | 0398a01f92e63de4d9c091525b98b9c247a8d0ef (patch) | |
| tree | 09e5c056cb9c345ab1372395cc5ae2e54102f1c5 /drivers/mmc | |
| parent | a2c4e61b051d30fc4f5d761288c756da2e11c32c (diff) | |
MLK-16461-1 mmc: sdhci-esdhc-imx: add strobe-dll-delay-target support
strobe-dll-delay-target is the delay cell add on the strobe line.
Strobe line the the uSDHC loopback read clock which is use in HS400
mode. Different strobe-dll-delay-target may need to set for different
board/SoC. If this delay cell is not set to an appropriate value,
we may see some read operation meet CRC error after HS400 mode select
which already pass the tuning.
This patch add the strobe-dll-delay-target setting in driver, so that
user can easily config this delay cell in dts file.
Signed-off-by: Haibo Chen <haibo.chen@nxp.com>
Reviewed-by: Dong Aisheng <aisheng.dong@nxp.com>
Diffstat (limited to 'drivers/mmc')
| -rw-r--r-- | drivers/mmc/host/sdhci-esdhc-imx.c | 14 |
1 files changed, 11 insertions, 3 deletions
diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c index 7397011cba1e..f3592fdd27e7 100644 --- a/drivers/mmc/host/sdhci-esdhc-imx.c +++ b/drivers/mmc/host/sdhci-esdhc-imx.c @@ -73,7 +73,7 @@ #define ESDHC_STROBE_DLL_CTRL 0x70 #define ESDHC_STROBE_DLL_CTRL_ENABLE (1 << 0) #define ESDHC_STROBE_DLL_CTRL_RESET (1 << 1) -#define ESDHC_STROBE_DLL_CTRL_SLV_DLY_TARGET 0x7 +#define ESDHC_STROBE_DLL_CTRL_SLV_DLY_TARGET_DEFAULT 0x7 #define ESDHC_STROBE_DLL_CTRL_SLV_DLY_TARGET_SHIFT 3 #define ESDHC_STROBE_DLL_STATUS 0x74 @@ -993,7 +993,10 @@ static int esdhc_change_pinstate(struct sdhci_host *host, */ static void esdhc_set_strobe_dll(struct sdhci_host *host) { + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); + struct pltfm_imx_data *imx_data = sdhci_pltfm_priv(pltfm_host); u32 v; + u32 strobe_delay; if (host->mmc->actual_clock > ESDHC_STROBE_DLL_CLK_FREQ) { /* disable clock before enabling strobe dll */ @@ -1008,9 +1011,12 @@ static void esdhc_set_strobe_dll(struct sdhci_host *host) * enable strobe dll ctrl and adjust the delay target * for the uSDHC loopback read clock */ + if (imx_data->boarddata.strobe_dll_delay_target) + strobe_delay = imx_data->boarddata.strobe_dll_delay_target; + else + strobe_delay = ESDHC_STROBE_DLL_CTRL_SLV_DLY_TARGET_DEFAULT; v = ESDHC_STROBE_DLL_CTRL_ENABLE | - (ESDHC_STROBE_DLL_CTRL_SLV_DLY_TARGET - << ESDHC_STROBE_DLL_CTRL_SLV_DLY_TARGET_SHIFT); + (strobe_delay << ESDHC_STROBE_DLL_CTRL_SLV_DLY_TARGET_SHIFT); writel(v, host->ioaddr + ESDHC_STROBE_DLL_CTRL); /* wait 1us to make sure strobe dll status register stable */ udelay(1); @@ -1309,6 +1315,8 @@ sdhci_esdhc_imx_probe_dt(struct platform_device *pdev, of_property_read_u32(np, "fsl,tuning-step", &boarddata->tuning_step); of_property_read_u32(np, "fsl,tuning-start-tap", &boarddata->tuning_start_tap); + of_property_read_u32(np, "fsl,strobe-dll-delay-target", + &boarddata->strobe_dll_delay_target); if (of_find_property(np, "no-1-8-v", NULL)) boarddata->support_vsel = false; |