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>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Link: https://lore.kernel.org/r/1582100757-20683-1-git-send-email-haibo.chen@nxp.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c
index 6bcdc5743d943a2963b75d323119bfd16f6abbc2..3359153304a369564de697e9afaa9790dfffcad6 100644 (file)
--- a/drivers/mmc/host/sdhci-esdhc-imx.c
+++ b/drivers/mmc/host/sdhci-esdhc-imx.c
@@ -73,6 +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_DEFAULT   0x7
 #define ESDHC_STROBE_DLL_CTRL_SLV_DLY_TARGET_SHIFT     3
 #define ESDHC_STROBE_DLL_CTRL_SLV_UPDATE_INT_DEFAULT   (4 << 20)
 
@@ -993,6 +994,9 @@ 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 strobe_delay;
        u32 v;
 
        /* disable clock before enabling strobe dll */
@@ -1010,9 +1014,13 @@ 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_UPDATE_INT_DEFAULT |
-               (7 << 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 5us to make sure strobe dll status register stable */
        udelay(5);
@@ -1338,6 +1346,8 @@ sdhci_esdhc_imx_probe_dt(struct platform_device *pdev,
        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))
                host->quirks2 |= SDHCI_QUIRK2_NO_1_8_V;
 

diff --git a/include/linux/platform_data/mmc-esdhc-imx.h b/include/linux/platform_data/mmc-esdhc-imx.h
index 6c006078c8a13dc596c02f9901b6a041549bec63..0434f68eda8650976d1a9e2a338cad609e99041d 100644 (file)
--- a/include/linux/platform_data/mmc-esdhc-imx.h
+++ b/include/linux/platform_data/mmc-esdhc-imx.h
@@ -37,5 +37,6 @@ struct esdhc_platform_data {
        unsigned int delay_line;
        unsigned int tuning_step;       /* The delay cell steps in tuning procedure */
        unsigned int tuning_start_tap;  /* The start delay cell point in tuning procedure */
+       unsigned int strobe_dll_delay_target;   /* The delay cell for strobe pad (read clock) */
 };
 #endif /* __ASM_ARCH_IMX_ESDHC_H */