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mmc: dw_mmc: push/pop all FIFO data if any data request

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When DTO interrupt occurred, there are any remaining data still in FIFO
due to RX FIFO threshold is larger than remaining data. It also
causes that dwmmc didn't trigger RXDR interrupt, so is TX.

It's responsibility of driver to read remaining bytes on seeing DTO
interrupt.

Signed-off-by: Jacob Chen <jacob2.chen@rock-chips.com>
Signed-off-by: Ziyuan Xu <xzy.xu@rock-chips.com>
This commit is contained in:
Jacob Chen 2016-09-19 10:16:50 +08:00 committed by Jaehoon Chung
parent 6dffdbc3a5
commit 2b42903397
1 changed files with 12 additions and 11 deletions
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23
drivers/mmc/dw_mmc.c
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@ -120,9 +120,9 @@ 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) {
if ((dwmci_readl(host, DWMCI_RINTSTS) &
DWMCI_INTMSK_RXDR)) {
if (data->flags == MMC_DATA_READ &&
(mask & DWMCI_INTMSK_RXDR)) {
while (size) {
len = dwmci_readl(host, DWMCI_STATUS);
len = (len >> DWMCI_FIFO_SHIFT) &
DWMCI_FIFO_MASK;
@ -130,12 +130,13 @@ static int dwmci_data_transfer(struct dwmci_host *host, struct mmc_data *data)
for (i = 0; i < len; i++)
*buf++ =
dwmci_readl(host, DWMCI_DATA);
dwmci_writel(host, DWMCI_RINTSTS,
DWMCI_INTMSK_RXDR);
size = size > len ? (size - len) : 0;
}
} else {
if ((dwmci_readl(host, DWMCI_RINTSTS) &
DWMCI_INTMSK_TXDR)) {
dwmci_writel(host, DWMCI_RINTSTS,
DWMCI_INTMSK_RXDR);
} else if (data->flags == MMC_DATA_WRITE &&
(mask & DWMCI_INTMSK_TXDR)) {
while (size) {
len = dwmci_readl(host, DWMCI_STATUS);
len = fifo_depth - ((len >>
DWMCI_FIFO_SHIFT) &
@ -144,11 +145,11 @@ static int dwmci_data_transfer(struct dwmci_host *host, struct mmc_data *data)
for (i = 0; i < len; i++)
dwmci_writel(host, DWMCI_DATA,
*buf++);
dwmci_writel(host, DWMCI_RINTSTS,
DWMCI_INTMSK_TXDR);
size = size > len ? (size - len) : 0;
}
dwmci_writel(host, DWMCI_RINTSTS,
DWMCI_INTMSK_TXDR);
}
size = size > len ? (size - len) : 0;
}
/* Data arrived correctly. */