On 14/12/17 15:09, Kishon Vijay Abraham I wrote: > Errata i802 in AM572x Sitara Processors Silicon Revision 2.0, 1.1 > (SPRZ429K July 2014–Revised March 2017 [1]) mentions > DCRC error interrupts (MMCHS_STAT[21] DCRC=0x1) can occur > during the tuning procedure and it has to be disabled during the > tuning procedure Implement workaround for Errata i802 here.. > > [1] -> http://www.ti.com/lit/er/sprz429k/sprz429k.pdf > > Signed-off-by: Kishon Vijay Abraham I <kishon@xxxxxx> Acked-by: Adrian Hunter <adrian.hunter@xxxxxxxxx> > --- > drivers/mmc/host/sdhci-omap.c | 13 +++++++++++++ > 1 file changed, 13 insertions(+) > > diff --git a/drivers/mmc/host/sdhci-omap.c b/drivers/mmc/host/sdhci-omap.c > index df8a0a472996..b20f4c79ccc6 100644 > --- a/drivers/mmc/host/sdhci-omap.c > +++ b/drivers/mmc/host/sdhci-omap.c > @@ -266,6 +266,7 @@ static int sdhci_omap_execute_tuning(struct mmc_host *mmc, u32 opcode) > struct sdhci_pltfm_host *pltfm_host; > struct sdhci_omap_host *omap_host; > struct device *dev; > + u32 ier = host->ier; > > pltfm_host = sdhci_priv(host); > omap_host = sdhci_pltfm_priv(pltfm_host); > @@ -283,6 +284,16 @@ static int sdhci_omap_execute_tuning(struct mmc_host *mmc, u32 opcode) > reg |= DLL_SWT; > sdhci_omap_writel(omap_host, SDHCI_OMAP_DLL, reg); > > + /* > + * OMAP5/DRA74X/DRA72x Errata i802: > + * DCRC error interrupts (MMCHS_STAT[21] DCRC=0x1) can occur > + * during the tuning procedure. So disable it during the > + * tuning procedure. > + */ > + ier &= ~SDHCI_INT_DATA_CRC; > + sdhci_writel(host, ier, SDHCI_INT_ENABLE); > + sdhci_writel(host, ier, SDHCI_SIGNAL_ENABLE); > + > while (phase_delay <= MAX_PHASE_DELAY) { > sdhci_omap_set_dll(omap_host, phase_delay); > > @@ -328,6 +339,8 @@ static int sdhci_omap_execute_tuning(struct mmc_host *mmc, u32 opcode) > > ret: > sdhci_reset(host, SDHCI_RESET_CMD | SDHCI_RESET_DATA); > + sdhci_writel(host, host->ier, SDHCI_INT_ENABLE); > + sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE); > return ret; > } > > -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
