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authorRajeshwari Shinde <rajeshwari.s@samsung.com>2013-05-24 18:15:34 +0530
committerMinkyu Kang <mk7.kang@samsung.com>2013-06-17 11:03:42 +0900
commited7bdc03eb516fb698ccc12ec5b4b9f132d05c5f (patch)
treea77142276a7ad943fd02b3dd303cd5b42a22edbe
parenteeb7d6a238f42c5c87892f9849cea00725f6d2d5 (diff)
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MMC: DWMMC: Fix FIFO_DEPTH calculation
Current DWMMC driver used to give FIFO underrun/overrun error every 3rd time for mmc rescan command. In current code FIFO_DEPTH is getting calculated after reading the default FIFOTH register and extracting the RX_WMARK bits from it i.e (RX_WMARK = FIFO_DEPTH/2 -1). Instead of storing the correct value, we were recalculating the FIFO_DEPT each time which is not correct. Based on "[PATCH V9 3/9] DWMMC: Initialise dwmci and resolve EMMC read write issues" http://permalink.gmane.org/gmane.comp.boot-loaders.u-boot/160247 Signed-off-by: Hatim Ali <hatim.rv@samsung.com> Signed-off-by: Rajeshwari Shinde <rajeshwari.s@samsung.com> Acked-by: Simon Glass <sjg@chromium.org> Tested-by: Simon Glass <sjg@chromium.org> Acked-by: Jaehoon Chung <jh80.chung@samsung.com> Acked-by: Andy Fleming <afleming@freescale.com> Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
-rw-r--r--drivers/mmc/dw_mmc.c14
1 files changed, 6 insertions, 8 deletions
diff --git a/drivers/mmc/dw_mmc.c b/drivers/mmc/dw_mmc.c
index 1307b12..5da20ed 100644
--- a/drivers/mmc/dw_mmc.c
+++ b/drivers/mmc/dw_mmc.c
@@ -312,7 +312,7 @@ static void dwmci_set_ios(struct mmc *mmc)
static int dwmci_init(struct mmc *mmc)
{
struct dwmci_host *host = (struct dwmci_host *)mmc->priv;
- u32 fifo_size, fifoth_val;
+ u32 fifo_size;
dwmci_writel(host, DWMCI_PWREN, 1);
@@ -332,15 +332,13 @@ static int dwmci_init(struct mmc *mmc)
dwmci_writel(host, DWMCI_IDINTEN, 0);
dwmci_writel(host, DWMCI_BMOD, 1);
- fifo_size = dwmci_readl(host, DWMCI_FIFOTH);
- fifo_size = ((fifo_size & RX_WMARK_MASK) >> RX_WMARK_SHIFT) + 1;
- if (host->fifoth_val) {
- fifoth_val = host->fifoth_val;
- } else {
- fifoth_val = MSIZE(0x2) | RX_WMARK(fifo_size / 2 - 1) |
+ if (!host->fifoth_val) {
+ fifo_size = dwmci_readl(host, DWMCI_FIFOTH);
+ fifo_size = ((fifo_size & RX_WMARK_MASK) >> RX_WMARK_SHIFT) + 1;
+ host->fifoth_val = MSIZE(0x2) | RX_WMARK(fifo_size / 2 - 1) |
TX_WMARK(fifo_size / 2);
}
- dwmci_writel(host, DWMCI_FIFOTH, fifoth_val);
+ dwmci_writel(host, DWMCI_FIFOTH, host->fifoth_val);
dwmci_writel(host, DWMCI_CLKENA, 0);
dwmci_writel(host, DWMCI_CLKSRC, 0);