On 21/03/17 16:32, Piotr Sroka wrote:
> Add polling for ACK to be sure that data are written to PHY register.
>
> Signed-off-by: Piotr Sroka <piotrs@xxxxxxxxxxx>
Acked-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>
> ---
> Changes for v2:
> - fix indent
> ---
> Changes for v3:
> - none
> ---
> Changes for v4:
> - none
> ---
> Changes for v5:
> - use driver version from next branch, with applied enhanced strobe feature support.
> ---
> drivers/mmc/host/sdhci-cadence.c | 11 +++++++++--
> 1 file changed, 9 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/mmc/host/sdhci-cadence.c b/drivers/mmc/host/sdhci-cadence.c
> index 48f6419..83c3b55 100644
> --- a/drivers/mmc/host/sdhci-cadence.c
> +++ b/drivers/mmc/host/sdhci-cadence.c
> @@ -68,11 +68,12 @@ struct sdhci_cdns_priv {
> bool enhanced_strobe;
> };
>
> -static void sdhci_cdns_write_phy_reg(struct sdhci_cdns_priv *priv,
> - u8 addr, u8 data)
> +static int sdhci_cdns_write_phy_reg(struct sdhci_cdns_priv *priv,
> + u8 addr, u8 data)
> {
> void __iomem *reg = priv->hrs_addr + SDHCI_CDNS_HRS04;
> u32 tmp;
> + int ret;
>
> tmp = (data << SDHCI_CDNS_HRS04_WDATA_SHIFT) |
> (addr << SDHCI_CDNS_HRS04_ADDR_SHIFT);
> @@ -81,8 +82,14 @@ static void sdhci_cdns_write_phy_reg(struct sdhci_cdns_priv *priv,
> tmp |= SDHCI_CDNS_HRS04_WR;
> writel(tmp, reg);
>
> + ret = readl_poll_timeout(reg, tmp, tmp & SDHCI_CDNS_HRS04_ACK, 0, 10);
> + if (ret)
> + return ret;
> +
> tmp &= ~SDHCI_CDNS_HRS04_WR;
> writel(tmp, reg);
> +
> + return 0;
> }
>
> static void sdhci_cdns_phy_init(struct sdhci_cdns_priv *priv)
>
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