On 05/24/2013 03:27 AM, Jagan Teki wrote:
On Thu, May 23, 2013 at 6:45 PM, Rajeshwari Shinde rajeshwari.s@samsung.com wrote:
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) {What is the inital value for host->fifoth_val, for the first time call.?
It should be set into board-specific file(dw-mmc_exynos.c) or others.
Best Regards, Jaehoon Chung
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);-- 1.7.4.4
Thanks, Jagan.