Hi, On 6/12/22 18:12, Pali Rohár wrote: > PING?
Sorry for too late. > > On Friday 29 April 2022 20:27:34 Pali Rohár wrote: >> Only newer eSDHC controllers set PRSSTAT_SDSTB flag. So do not wait until >> flag PRSSTAT_SDSTB is set on old pre-2.2 controllers. Instead sleep for >> fixed amount of time like it was before commit 6f883e501b65 ("mmc: >> fsl_esdhc: Add emmc hs200 support"). >> >> This change fixes error 'Internal clock never stabilised.' which is printed >> on P2020 board at every access to SD card. >> >> Fixes: 6f883e501b65 ("mmc: fsl_esdhc: Add emmc hs200 support") >> Signed-off-by: Pali Rohár <p...@kernel.org> Reviewed-by: Jaehoon Chung <jh80.ch...@samsung.com> Best Regards, Jaehoon Chung >> --- >> drivers/mmc/fsl_esdhc.c | 17 +++++++++++++++++ >> 1 file changed, 17 insertions(+) >> >> diff --git a/drivers/mmc/fsl_esdhc.c b/drivers/mmc/fsl_esdhc.c >> index fdf2cc290e06..3b3587bd8d72 100644 >> --- a/drivers/mmc/fsl_esdhc.c >> +++ b/drivers/mmc/fsl_esdhc.c >> @@ -503,6 +503,7 @@ static void set_sysctl(struct fsl_esdhc_priv *priv, >> struct mmc *mmc, uint clock) >> u32 time_out; >> u32 value; >> uint clk; >> + u32 hostver; >> >> if (clock < mmc->cfg->f_min) >> clock = mmc->cfg->f_min; >> @@ -543,6 +544,14 @@ static void set_sysctl(struct fsl_esdhc_priv *priv, >> struct mmc *mmc, uint clock) >> >> esdhc_clrsetbits32(®s->sysctl, SYSCTL_CLOCK_MASK, clk); >> >> + /* Only newer eSDHC controllers set PRSSTAT_SDSTB flag */ >> + hostver = esdhc_read32(&priv->esdhc_regs->hostver); >> + if (HOSTVER_VENDOR(hostver) <= VENDOR_V_22) { >> + udelay(10000); >> + esdhc_setbits32(®s->sysctl, SYSCTL_PEREN | SYSCTL_CKEN); >> + return; >> + } >> + >> time_out = 20; >> value = PRSSTAT_SDSTB; >> while (!(esdhc_read32(®s->prsstat) & value)) { >> @@ -562,6 +571,7 @@ static void esdhc_clock_control(struct fsl_esdhc_priv >> *priv, bool enable) >> struct fsl_esdhc *regs = priv->esdhc_regs; >> u32 value; >> u32 time_out; >> + u32 hostver; >> >> value = esdhc_read32(®s->sysctl); >> >> @@ -572,6 +582,13 @@ static void esdhc_clock_control(struct fsl_esdhc_priv >> *priv, bool enable) >> >> esdhc_write32(®s->sysctl, value); >> >> + /* Only newer eSDHC controllers set PRSSTAT_SDSTB flag */ >> + hostver = esdhc_read32(&priv->esdhc_regs->hostver); >> + if (HOSTVER_VENDOR(hostver) <= VENDOR_V_22) { >> + udelay(10000); >> + return; >> + } >> + >> time_out = 20; >> value = PRSSTAT_SDSTB; >> while (!(esdhc_read32(®s->prsstat) & value)) { >> -- >> 2.20.1 >> >