On 5/03/19 4:59 AM, Yinbo Zhu wrote:
> From: Yinbo Zhu <yinbo.zhu@xxxxxxx>
>
> In the event of that any data error (like, IRQSTAT[DCE]) occurs
> during an eSDHC data transaction where DMA is used for data
> transfer to/from the system memory, setting the SYSCTL[RSTD]
> register may cause a system hang. If software sets the register
> SYSCTL[RSTD] to 1 for error recovery while DMA transferring is
> not complete, eSDHC may hang the system bus. This happens because
> the software register SYSCTL[RSTD] resets the DMA engine without
> waiting for the completion of pending system transactions. This
> erratum is to fix this issue.
>
> Signed-off-by: Yinbo Zhu <yinbo.zhu@xxxxxxx>
Acked-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>
> ---
> drivers/mmc/host/sdhci-of-esdhc.c | 3 +++
> 1 files changed, 3 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/mmc/host/sdhci-of-esdhc.c b/drivers/mmc/host/sdhci-of-esdhc.c
> index 1ac1133..7e0eae8 100644
> --- a/drivers/mmc/host/sdhci-of-esdhc.c
> +++ b/drivers/mmc/host/sdhci-of-esdhc.c
> @@ -694,6 +694,9 @@ static void esdhc_reset(struct sdhci_host *host, u8 mask)
> sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
> sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
>
> + if (of_find_compatible_node(NULL, NULL, "fsl,p2020-esdhc"))
> + mdelay(5);
> +
> if (mask & SDHCI_RESET_ALL) {
> val = sdhci_readl(host, ESDHC_TBCTL);
> val &= ~ESDHC_TB_EN;
>
