| Message ID | 20210915102838.8344-1-claudiu.beznea@microchip.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | mmc: sdhci-of-at91: wait for calibration done before proceed | expand |
On 15/09/2021 at 12:28, Claudiu Beznea wrote: > Datasheet specifies that at the end of calibration the SDMMC_CALCR_EN > bit will be cleared. No commands should be send before calibration is > done. > > Fixes: dbdea70f71d67 ("mmc: sdhci-of-at91: fix CALCR register being rewritten") > Fixes: 727d836a375ad ("mmc: sdhci-of-at91: add DT property to enable calibration on full reset") > Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com> Indeed, needed. Thanks Claudiu, Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com> Best regards, Nicolas > --- > drivers/mmc/host/sdhci-of-at91.c | 10 ++++++++++ > 1 file changed, 10 insertions(+) > > diff --git a/drivers/mmc/host/sdhci-of-at91.c b/drivers/mmc/host/sdhci-of-at91.c > index 5564d7b23e7c..2b28711e039d 100644 > --- a/drivers/mmc/host/sdhci-of-at91.c > +++ b/drivers/mmc/host/sdhci-of-at91.c > @@ -114,6 +114,8 @@ static void sdhci_at91_reset(struct sdhci_host *host, u8 mask) > { > struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); > struct sdhci_at91_priv *priv = sdhci_pltfm_priv(pltfm_host); > + unsigned long timeout = jiffies + msecs_to_jiffies(20); > + unsigned int tmp; > > sdhci_reset(host, mask); > > @@ -126,6 +128,14 @@ static void sdhci_at91_reset(struct sdhci_host *host, u8 mask) > > sdhci_writel(host, calcr | SDMMC_CALCR_ALWYSON | SDMMC_CALCR_EN, > SDMMC_CALCR); > + > + do { > + tmp = sdhci_readl(host, SDMMC_CALCR); > + } while (time_before(jiffies, timeout) && > + (tmp & SDMMC_CALCR_EN)); > + > + if (tmp & SDMMC_CALCR_EN) > + dev_err(mmc_dev(host->mmc), "Failed to calibrate\n"); > } > } > >
On 15/09/21 1:28 pm, Claudiu Beznea wrote: > Datasheet specifies that at the end of calibration the SDMMC_CALCR_EN > bit will be cleared. No commands should be send before calibration is > done. > > Fixes: dbdea70f71d67 ("mmc: sdhci-of-at91: fix CALCR register being rewritten") > Fixes: 727d836a375ad ("mmc: sdhci-of-at91: add DT property to enable calibration on full reset") > Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com> > --- > drivers/mmc/host/sdhci-of-at91.c | 10 ++++++++++ > 1 file changed, 10 insertions(+) > > diff --git a/drivers/mmc/host/sdhci-of-at91.c b/drivers/mmc/host/sdhci-of-at91.c > index 5564d7b23e7c..2b28711e039d 100644 > --- a/drivers/mmc/host/sdhci-of-at91.c > +++ b/drivers/mmc/host/sdhci-of-at91.c > @@ -114,6 +114,8 @@ static void sdhci_at91_reset(struct sdhci_host *host, u8 mask) > { > struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); > struct sdhci_at91_priv *priv = sdhci_pltfm_priv(pltfm_host); > + unsigned long timeout = jiffies + msecs_to_jiffies(20); > + unsigned int tmp; > > sdhci_reset(host, mask); > > @@ -126,6 +128,14 @@ static void sdhci_at91_reset(struct sdhci_host *host, u8 mask) > > sdhci_writel(host, calcr | SDMMC_CALCR_ALWYSON | SDMMC_CALCR_EN, > SDMMC_CALCR); > + > + do { > + tmp = sdhci_readl(host, SDMMC_CALCR); > + } while (time_before(jiffies, timeout) && > + (tmp & SDMMC_CALCR_EN)); > + > + if (tmp & SDMMC_CALCR_EN) > + dev_err(mmc_dev(host->mmc), "Failed to calibrate\n"); Please use a polling macro (include <linux/iopoll.h>) i.e. if (read_poll_timeout(sdhci_readl, tmp, !(tmp & SDMMC_CALCR_EN), 10, 20000, false, host, SDMMC_CALCR)) dev_err(mmc_dev(host->mmc), "Failed to calibrate\n"); > } > } > >
diff --git a/drivers/mmc/host/sdhci-of-at91.c b/drivers/mmc/host/sdhci-of-at91.c index 5564d7b23e7c..2b28711e039d 100644 --- a/drivers/mmc/host/sdhci-of-at91.c +++ b/drivers/mmc/host/sdhci-of-at91.c @@ -114,6 +114,8 @@ static void sdhci_at91_reset(struct sdhci_host *host, u8 mask) { struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); struct sdhci_at91_priv *priv = sdhci_pltfm_priv(pltfm_host); + unsigned long timeout = jiffies + msecs_to_jiffies(20); + unsigned int tmp; sdhci_reset(host, mask); @@ -126,6 +128,14 @@ static void sdhci_at91_reset(struct sdhci_host *host, u8 mask) sdhci_writel(host, calcr | SDMMC_CALCR_ALWYSON | SDMMC_CALCR_EN, SDMMC_CALCR); + + do { + tmp = sdhci_readl(host, SDMMC_CALCR); + } while (time_before(jiffies, timeout) && + (tmp & SDMMC_CALCR_EN)); + + if (tmp & SDMMC_CALCR_EN) + dev_err(mmc_dev(host->mmc), "Failed to calibrate\n"); } }
Datasheet specifies that at the end of calibration the SDMMC_CALCR_EN bit will be cleared. No commands should be send before calibration is done. Fixes: dbdea70f71d67 ("mmc: sdhci-of-at91: fix CALCR register being rewritten") Fixes: 727d836a375ad ("mmc: sdhci-of-at91: add DT property to enable calibration on full reset") Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com> --- drivers/mmc/host/sdhci-of-at91.c | 10 ++++++++++ 1 file changed, 10 insertions(+)