dany/u-boot-megous
1
0
Fork 0
mirror of https://xff.cz/git/u-boot/ synced 2025-09-04 02:02:08 +02:00
Code Issues Packages Projects Releases Wiki Activity

mmc: dw_mmc: reset controller after data error

Browse Source 
Per dw_mmc databook, it's recommended to reset the host controller if
some data-related error occurred.
Implement a reset mechanism.

Signed-off-by: Ziyuan Xu <xzy.xu@rock-chips.com>
Co-developed-by: Jason Zhu <jason.zhu@rock-chips.com>
Signed-off-by: Jason Zhu <jason.zhu@rock-chips.com>
[eugen.hristev@collabora.com: modified a bit the variables initialization]
Signed-off-by: Eugen Hristev <eugen.hristev@collabora.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
This commit is contained in:
Ziyuan Xu
2023-04-03 13:44:46 +03:00
committed by Ondrej Jirman
parent 61fb2fa5f7
commit f4a8889ab8
1 changed files with 19 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

20
drivers/mmc/dw_mmc.c
View File

@@ -138,7 +138,7 @@ static int dwmci_data_transfer(struct dwmci_host *host, struct mmc_data *data)
{
struct mmc *mmc = host->mmc;
int ret = 0;
u32 timeout, mask, size, i, len = 0;
u32 timeout, reset_timeout = 100, status, ctrl, mask, size, i, len = 0;
u32 *buf = NULL;
ulong start = get_timer(0);
u32 fifo_depth = (((host->fifoth_val & RX_WMARK_MASK) >>
@@ -159,6 +159,24 @@ static int dwmci_data_transfer(struct dwmci_host *host, struct mmc_data *data)
/* Error during data transfer. */
if (mask & (DWMCI_DATA_ERR | DWMCI_DATA_TOUT)) {
debug("%s: DATA ERROR!\n", __func__);
dwmci_wait_reset(host, DWMCI_RESET_ALL);
dwmci_writel(host, DWMCI_CMD, DWMCI_CMD_PRV_DAT_WAIT |
DWMCI_CMD_UPD_CLK | DWMCI_CMD_START);
do {
status = dwmci_readl(host, DWMCI_CMD);
if (!reset_timeout--)
break;
udelay(100);
} while (status & DWMCI_CMD_START);
if (!host->fifo_mode) {
ctrl = dwmci_readl(host, DWMCI_BMOD);
ctrl |= DWMCI_BMOD_IDMAC_RESET;
dwmci_writel(host, DWMCI_BMOD, ctrl);
}
ret = -EINVAL;
break;
}