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>

diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
index 6da19c15d73bba06b7827ae8d20c294d6d093db6..2f4a62ffb22db6bbab7dd58282c9fde8bc685dd7 100644 (file)
--- a/drivers/mmc/host/dw_mmc.c
+++ b/drivers/mmc/host/dw_mmc.c
@@ -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) {