mmc: msm_sdcc: Check for only DATA_END interrupt to end a request

The current code checks for both DATA_END and DATA_BLK_END bits in
MCI_STATUS register and ends a request only if both are set at a time.
The hardware doesn't always set DATA_BLK_END when DATA_END is set.
But DATA_END status itself is sufficient condition from hardware that
data transfer is done and hence, check for only DATA_END interrupt in
software to end a request.

Signed-off-by: Sahitya Tummala <stummala@codeaurora.org>
Signed-off-by: David Brown <davidb@codeaurora.org>

diff --git a/drivers/mmc/host/msm_sdcc.c b/drivers/mmc/host/msm_sdcc.c
index 9badc51..5decfd0 100644 (file)
--- a/drivers/mmc/host/msm_sdcc.c
+++ b/drivers/mmc/host/msm_sdcc.c
@@ -190,7 +190,7 @@ static void
 msmsdcc_stop_data(struct msmsdcc_host *host)
 {
        host->curr.data = NULL;
-       host->curr.got_dataend = host->curr.got_datablkend = 0;
+       host->curr.got_dataend = 0;
 }
 
 uint32_t msmsdcc_fifo_addr(struct msmsdcc_host *host)
@@ -277,8 +277,7 @@ msmsdcc_dma_complete_tlet(unsigned long data)
        host->dma.sg = NULL;
        host->dma.busy = 0;
 
-       if ((host->curr.got_dataend && host->curr.got_datablkend)
-            || mrq->data->error) {
+       if (host->curr.got_dataend || mrq->data->error) {
 
                /*
                 * If we've already gotten our DATAEND / DATABLKEND
@@ -506,7 +505,6 @@ msmsdcc_start_data(struct msmsdcc_host *host, struct mmc_data *data,
        host->curr.xfer_remain = host->curr.xfer_size;
        host->curr.data_xfered = 0;
        host->curr.got_dataend = 0;
-       host->curr.got_datablkend = 0;
 
        memset(&host->pio, 0, sizeof(host->pio));
 
@@ -827,14 +825,10 @@ msmsdcc_handle_irq_data(struct msmsdcc_host *host, u32 status,
        if (!host->curr.got_dataend && (status & MCI_DATAEND))
                host->curr.got_dataend = 1;
 
-       if (!host->curr.got_datablkend && (status & MCI_DATABLOCKEND))
-               host->curr.got_datablkend = 1;
-
        /*
         * If DMA is still in progress, we complete via the completion handler
         */
-       if (host->curr.got_dataend && host->curr.got_datablkend &&
-           !host->dma.busy) {
+       if (host->curr.got_dataend && !host->dma.busy) {
                /*
                 * There appears to be an issue in the controller where
                 * if you request a small block transfer (< fifo size),
@@ -871,8 +865,7 @@ msmsdcc_irq(int irq, void *dev_id)
 
        do {
                status = msmsdcc_readl(host, MMCISTATUS);
-               status &= (msmsdcc_readl(host, MMCIMASK0) |
-                                             MCI_DATABLOCKENDMASK);
+               status &= msmsdcc_readl(host, MMCIMASK0);
                msmsdcc_writel(host, status, MMCICLEAR);
 
                if (status & MCI_SDIOINTR)

diff --git a/drivers/mmc/host/msm_sdcc.h b/drivers/mmc/host/msm_sdcc.h
index e0579a1..939557a 100644 (file)
--- a/drivers/mmc/host/msm_sdcc.h
+++ b/drivers/mmc/host/msm_sdcc.h
@@ -190,7 +190,6 @@ struct msmsdcc_curr_req {
        unsigned int            xfer_remain;    /* Bytes remaining to send */
        unsigned int            data_xfered;    /* Bytes acked by BLKEND irq */
        int                     got_dataend;
-       int                     got_datablkend;
        int                     user_pages;
 };