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mmc: dw_mmc: Fixes data read when receiving DTO interrupt in FIFO mode 

The data read is not working when using FIFO mode.

From DesignWare databook, when a Data_Transfer_Over (DTO) interrupt is
received, the software should read the remaining data from FIFO.

Add DTO interrupt checking on data read path and clear interrupts before
start reading from FIFO. So, it doesn't clear the next pending
interrupts unintentionally after read from FIFO.

Signed-off-by: Ley Foon Tan <ley.foon.tan@intel.com>
Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>
This commit is contained in:
Ley Foon Tan 2021-04-26 11:35:05 +08:00 committed by Peng Fan
parent 3a3672cc37
commit 8cb9d3ed3a
1 changed files with 3 additions and 3 deletions
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6
drivers/mmc/dw_mmc.c
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@ -166,7 +166,9 @@ static int dwmci_data_transfer(struct dwmci_host *host, struct mmc_data *data)
if (host->fifo_mode && size) {
len = 0;
if (data->flags == MMC_DATA_READ &&
(mask & DWMCI_INTMSK_RXDR)) {
(mask & (DWMCI_INTMSK_RXDR | DWMCI_INTMSK_DTO))) {
dwmci_writel(host, DWMCI_RINTSTS,
DWMCI_INTMSK_RXDR | DWMCI_INTMSK_DTO);
while (size) {
ret = dwmci_fifo_ready(host,
DWMCI_FIFO_EMPTY,
@ -182,8 +184,6 @@ static int dwmci_data_transfer(struct dwmci_host *host, struct mmc_data *data)
dwmci_readl(host, DWMCI_DATA);
size = size > len ? (size - len) : 0;
}
dwmci_writel(host, DWMCI_RINTSTS,
DWMCI_INTMSK_RXDR);
} else if (data->flags == MMC_DATA_WRITE &&
(mask & DWMCI_INTMSK_TXDR)) {
while (size) {