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mmc: dw_mmc: empty FIFO after data transfer over interrupt in pio mode 

In dwc manual, the below contents are described:

"During end of packet, interrupt is not generated if threshold
programming is larger than any remaining data. It is responsibility
of host to read remaining bytes on seeing Data Transfer Done
interrupt"

We also have seen the data cannot be read fully when
"sg_miter->length" is less than FIFO size.

Signed-off-by: Kyoungil Kim <ki0351.kim@samsung.com>
Signed-off-by: Seungwon Jeon <tgih.jun@samsung.com>
Acked-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
This commit is contained in:
Kyoungil Kim 2013-01-22 16:46:30 +09:00 committed by Chris Ball
parent 0cea529d1a
commit 87a74d399a
1 changed files with 6 additions and 4 deletions
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10
drivers/mmc/host/dw_mmc.c
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@ -1438,7 +1438,7 @@ static void dw_mci_pull_data(struct dw_mci *host, void *buf, int cnt)
host->pull_data(host, buf, cnt);
}
static void dw_mci_read_data_pio(struct dw_mci *host)
static void dw_mci_read_data_pio(struct dw_mci *host, bool dto)
{
struct sg_mapping_iter *sg_miter = &host->sg_miter;
void *buf;
@ -1473,7 +1473,9 @@ static void dw_mci_read_data_pio(struct dw_mci *host)
sg_miter->consumed = offset;
status = mci_readl(host, MINTSTS);
mci_writel(host, RINTSTS, SDMMC_INT_RXDR);
} while (status & SDMMC_INT_RXDR); /*if the RXDR is ready read again*/
/* if the RXDR is ready read again */
} while ((status & SDMMC_INT_RXDR) ||
(dto && SDMMC_GET_FCNT(mci_readl(host, STATUS))));
data->bytes_xfered += nbytes;
if (!remain) {
@ -1605,7 +1607,7 @@ static irqreturn_t dw_mci_interrupt(int irq, void *dev_id)
smp_wmb();
if (host->dir_status == DW_MCI_RECV_STATUS) {
if (host->sg != NULL)
dw_mci_read_data_pio(host);
dw_mci_read_data_pio(host, true);
}
set_bit(EVENT_DATA_COMPLETE, &host->pending_events);
tasklet_schedule(&host->tasklet);
@ -1614,7 +1616,7 @@ static irqreturn_t dw_mci_interrupt(int irq, void *dev_id)
if (pending & SDMMC_INT_RXDR) {
mci_writel(host, RINTSTS, SDMMC_INT_RXDR);
if (host->dir_status == DW_MCI_RECV_STATUS && host->sg)
dw_mci_read_data_pio(host);
dw_mci_read_data_pio(host, false);
}
if (pending & SDMMC_INT_TXDR) {