[PATCH] 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 --- drivers/mmc/dw_mmc.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/mmc/dw_mmc.c b/drivers/mmc/dw_mmc.c index 7c8a312fa71a..a949dad57402 100644 --- a/drivers/mmc/dw_mmc.c +++ b/drivers/mmc/dw_mmc.c @@ -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) {
On 4/26/21 12:35 PM, Ley Foon Tan wrote:
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
Best Regards, Jaehoon Chung
drivers/mmc/dw_mmc.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/mmc/dw_mmc.c b/drivers/mmc/dw_mmc.c index 7c8a312fa71a..a949dad57402 100644 --- a/drivers/mmc/dw_mmc.c +++ b/drivers/mmc/dw_mmc.c @@ -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) {
participants (2)
-
Jaehoon Chung -
Ley Foon Tan