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>
---
drivers/mmc/host/sdhci.c | 3 +++
1 files changed, 3 insertions(+), 0 deletions(-)
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 39bbbd7..6f604d6 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -243,6 +243,9 @@ static void sdhci_do_reset(struct sdhci_host *host, u8 mask)
host->ops->reset(host, mask);
+ if (of_find_compatible_node(NULL, NULL, "fsl,p2020-esdhc"))
+ mdelay(5);
+
if (mask & SDHCI_RESET_ALL) {
if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
if (host->ops->enable_dma)
--
1.7.1
