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 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.
Signed-off-by: Hatim Ali hatim.rv@samsung.com Signed-off-by: Rajeshwari Shinde rajeshwari.s@samsung.com --- drivers/mmc/dw_mmc.c | 6 ++++-- 1 files changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/mmc/dw_mmc.c b/drivers/mmc/dw_mmc.c index 4070d4e..be590a4 100644 --- a/drivers/mmc/dw_mmc.c +++ b/drivers/mmc/dw_mmc.c @@ -332,11 +332,13 @@ static int dwmci_init(struct mmc *mmc) dwmci_writel(host, DWMCI_BMOD, 1);
fifo_size = dwmci_readl(host, DWMCI_FIFOTH); - if (host->fifoth_val) + if (host->fifoth_val) { fifoth_val = host->fifoth_val; - else + } else { fifoth_val = MSIZE(0x2) | RX_WMARK(fifo_size/2 -1) | TX_WMARK(fifo_size/2); + host->fifoth_val = fifoth_val; + } dwmci_writel(host, DWMCI_FIFOTH, fifoth_val);
dwmci_writel(host, DWMCI_CLKENA, 0);