> -----Original Message-----
> From: Kongyang Liu <[email protected]>
> Sent: Tuesday, April 16, 2024 4:31 PM
> To: [email protected]
> Cc: Jaehoon Chung <[email protected]>; Leo Yu-Chi Liang
> <[email protected]>; Peng Fan
> <[email protected]>; Tom Rini <[email protected]>
> Subject: [PATCH] mmc: cv1800b: Add transmit tap delay config to fix write
> error
>
> Currently, only the receive delay is configured while the transmit delay
> is not set, which may result in errors when writing to the file. This issue
> can be resolved by setting PHY_TX_SRC_INVERT to SDHCI_PHY_TX_RX_DLY.
>
> Signed-off-by: Kongyang Liu <[email protected]>
Reviewed-by: Jaehoon Chung <[email protected]>
Best Regards,
Jaehoon Chung
> ---
>
> drivers/mmc/cv1800b_sdhci.c | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/mmc/cv1800b_sdhci.c b/drivers/mmc/cv1800b_sdhci.c
> index 2275c53777..a50f4cff0d 100644
> --- a/drivers/mmc/cv1800b_sdhci.c
> +++ b/drivers/mmc/cv1800b_sdhci.c
> @@ -12,6 +12,8 @@
> #define MMC_MAX_CLOCK 375000000
> #define TUNE_MAX_PHCODE 128
>
> +#define PHY_TX_SRC_INVERT BIT(8)
> +
> struct cv1800b_sdhci_plat {
> struct mmc_config cfg;
> struct mmc mmc;
> @@ -19,7 +21,7 @@ struct cv1800b_sdhci_plat {
>
> static void cv1800b_set_tap_delay(struct sdhci_host *host, u16 tap)
> {
> - sdhci_writel(host, tap << 16, SDHCI_PHY_TX_RX_DLY);
> + sdhci_writel(host, PHY_TX_SRC_INVERT | tap << 16, SDHCI_PHY_TX_RX_DLY);
> }
>
> static void cv1800b_sdhci_reset(struct sdhci_host *host, u8 mask)
> --
> 2.41.0
