diff options
Diffstat (limited to 'drivers/mmc/host/sdhci-cadence.c')
| -rw-r--r-- | drivers/mmc/host/sdhci-cadence.c | 22 |
1 files changed, 18 insertions, 4 deletions
diff --git a/drivers/mmc/host/sdhci-cadence.c b/drivers/mmc/host/sdhci-cadence.c index 0f589e2..7a343b8 100644 --- a/drivers/mmc/host/sdhci-cadence.c +++ b/drivers/mmc/host/sdhci-cadence.c @@ -253,6 +253,7 @@ static int sdhci_cdns_set_tune_val(struct sdhci_host *host, unsigned int val) struct sdhci_cdns_priv *priv = sdhci_cdns_priv(host); void __iomem *reg = priv->hrs_addr + SDHCI_CDNS_HRS06; u32 tmp; + int i, ret; if (WARN_ON(!FIELD_FIT(SDHCI_CDNS_HRS06_TUNE, val))) return -EINVAL; @@ -260,11 +261,24 @@ static int sdhci_cdns_set_tune_val(struct sdhci_host *host, unsigned int val) tmp = readl(reg); tmp &= ~SDHCI_CDNS_HRS06_TUNE; tmp |= FIELD_PREP(SDHCI_CDNS_HRS06_TUNE, val); - tmp |= SDHCI_CDNS_HRS06_TUNE_UP; - writel(tmp, reg); - return readl_poll_timeout(reg, tmp, !(tmp & SDHCI_CDNS_HRS06_TUNE_UP), - 0, 1); + /* + * Workaround for IP errata: + * The IP6116 SD/eMMC PHY design has a timing issue on receive data + * path. Send tune request twice. + */ + for (i = 0; i < 2; i++) { + tmp |= SDHCI_CDNS_HRS06_TUNE_UP; + writel(tmp, reg); + + ret = readl_poll_timeout(reg, tmp, + !(tmp & SDHCI_CDNS_HRS06_TUNE_UP), + 0, 1); + if (ret) + return ret; + } + + return 0; } static int sdhci_cdns_execute_tuning(struct mmc_host *mmc, u32 opcode) |
