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| author | Haibo Chen <haibo.chen@nxp.com> | 2021-03-03 17:05:46 +0800 |
|---|---|---|
| committer | Stefano Babic <sbabic@denx.de> | 2021-04-08 23:44:40 +0200 |
| commit | 63756575b42b8b4fb3f59cbbf0cedf03331bc2d2 (patch) | |
| tree | 588f99ca8cff444255aad60793e42b082e8c5e27 /drivers/mmc | |
| parent | dec7755c442ff84358704a5566e4ae908afecf13 (diff) | |
| download | u-boot-63756575b42b8b4fb3f59cbbf0cedf03331bc2d2.zip u-boot-63756575b42b8b4fb3f59cbbf0cedf03331bc2d2.tar.gz u-boot-63756575b42b8b4fb3f59cbbf0cedf03331bc2d2.tar.bz2 | |
mmc: fsl_esdhc_imx: use VENDORSPEC_FRC_SDCLK_ON to control card clock output
For FSL_USDHC, it do not implement VENDORSPEC_CKEN/PEREN/HCKEN/IPGEN, these
are reserved bits. Instead, use VENDORSPEC_FRC_SDCLK_ON to gate on/off the
card clock output.
After commit b5874b552ffa ("mmc: fsl_esdhc_imx: add wait_dat0() support"),
we meet SD3.0 card can't work at UHS mode, mmc_switch_voltage() fail because
the second mmc_wait_dat0 return -ETIMEDOUT. According to SD spec, during
voltage switch, need to gate off/on the card clock. If not set the FRC_SDCLK_ON,
after CMD11, hardware will gate off the card clock automatically, so card do
not detect the clock off/on behavior, so will draw the data0 line low until
next command.
Fixes: b5874b552ffa ("mmc: fsl_esdhc_imx: add wait_dat0() support")
Tested-by: Tim Harvey <tharvey@gateworks.com>
Signed-off-by: Haibo Chen <haibo.chen@nxp.com>
Diffstat (limited to 'drivers/mmc')
| -rw-r--r-- | drivers/mmc/fsl_esdhc_imx.c | 29 |
1 files changed, 21 insertions, 8 deletions
diff --git a/drivers/mmc/fsl_esdhc_imx.c b/drivers/mmc/fsl_esdhc_imx.c index 09a5cd6..420bd25 100644 --- a/drivers/mmc/fsl_esdhc_imx.c +++ b/drivers/mmc/fsl_esdhc_imx.c @@ -660,7 +660,10 @@ static void set_sysctl(struct fsl_esdhc_priv *priv, struct mmc *mmc, uint clock) clk = (pre_div << 8) | (div << 4); #ifdef CONFIG_FSL_USDHC - esdhc_clrbits32(®s->vendorspec, VENDORSPEC_CKEN); + esdhc_clrbits32(®s->vendorspec, VENDORSPEC_FRC_SDCLK_ON); + ret = readx_poll_timeout(esdhc_read32, ®s->prsstat, tmp, tmp & PRSSTAT_SDOFF, 100); + if (ret) + pr_warn("fsl_esdhc_imx: Internal clock never gate off.\n"); #else esdhc_clrbits32(®s->sysctl, SYSCTL_CKEN); #endif @@ -672,7 +675,7 @@ static void set_sysctl(struct fsl_esdhc_priv *priv, struct mmc *mmc, uint clock) pr_warn("fsl_esdhc_imx: Internal clock never stabilised.\n"); #ifdef CONFIG_FSL_USDHC - esdhc_setbits32(®s->vendorspec, VENDORSPEC_PEREN | VENDORSPEC_CKEN); + esdhc_setbits32(®s->vendorspec, VENDORSPEC_FRC_SDCLK_ON); #else esdhc_setbits32(®s->sysctl, SYSCTL_PEREN | SYSCTL_CKEN); #endif @@ -727,8 +730,14 @@ static void esdhc_set_strobe_dll(struct mmc *mmc) struct fsl_esdhc_priv *priv = dev_get_priv(mmc->dev); struct fsl_esdhc *regs = priv->esdhc_regs; u32 val; + u32 tmp; + int ret; if (priv->clock > ESDHC_STROBE_DLL_CLK_FREQ) { + esdhc_clrbits32(®s->vendorspec, VENDORSPEC_FRC_SDCLK_ON); + ret = readx_poll_timeout(esdhc_read32, ®s->prsstat, tmp, tmp & PRSSTAT_SDOFF, 100); + if (ret) + pr_warn("fsl_esdhc_imx: Internal clock never gate off.\n"); esdhc_write32(®s->strobe_dllctrl, ESDHC_STROBE_DLL_CTRL_RESET); /* @@ -746,6 +755,7 @@ static void esdhc_set_strobe_dll(struct mmc *mmc) pr_warn("HS400 strobe DLL status REF not lock!\n"); if (!(val & ESDHC_STROBE_DLL_STS_SLV_LOCK)) pr_warn("HS400 strobe DLL status SLV not lock!\n"); + esdhc_setbits32(®s->vendorspec, VENDORSPEC_FRC_SDCLK_ON); } } @@ -969,14 +979,18 @@ static int esdhc_set_ios_common(struct fsl_esdhc_priv *priv, struct mmc *mmc) #ifdef MMC_SUPPORTS_TUNING if (mmc->clk_disable) { #ifdef CONFIG_FSL_USDHC - esdhc_clrbits32(®s->vendorspec, VENDORSPEC_CKEN); + u32 tmp; + + esdhc_clrbits32(®s->vendorspec, VENDORSPEC_FRC_SDCLK_ON); + ret = readx_poll_timeout(esdhc_read32, ®s->prsstat, tmp, tmp & PRSSTAT_SDOFF, 100); + if (ret) + pr_warn("fsl_esdhc_imx: Internal clock never gate off.\n"); #else esdhc_clrbits32(®s->sysctl, SYSCTL_CKEN); #endif } else { #ifdef CONFIG_FSL_USDHC - esdhc_setbits32(®s->vendorspec, VENDORSPEC_PEREN | - VENDORSPEC_CKEN); + esdhc_setbits32(®s->vendorspec, VENDORSPEC_FRC_SDCLK_ON); #else esdhc_setbits32(®s->sysctl, SYSCTL_PEREN | SYSCTL_CKEN); #endif @@ -1052,7 +1066,7 @@ static int esdhc_init_common(struct fsl_esdhc_priv *priv, struct mmc *mmc) #ifndef CONFIG_FSL_USDHC esdhc_setbits32(®s->sysctl, SYSCTL_HCKEN | SYSCTL_IPGEN); #else - esdhc_setbits32(®s->vendorspec, VENDORSPEC_HCKEN | VENDORSPEC_IPGEN); + esdhc_setbits32(®s->vendorspec, VENDORSPEC_FRC_SDCLK_ON); #endif /* Set the initial clock speed */ @@ -1190,8 +1204,7 @@ static int fsl_esdhc_init(struct fsl_esdhc_priv *priv, esdhc_write32(®s->autoc12err, 0); esdhc_write32(®s->clktunectrlstatus, 0); #else - esdhc_setbits32(®s->vendorspec, VENDORSPEC_PEREN | - VENDORSPEC_HCKEN | VENDORSPEC_IPGEN | VENDORSPEC_CKEN); + esdhc_setbits32(®s->vendorspec, VENDORSPEC_FRC_SDCLK_ON); #endif if (priv->vs18_enable) |