mmc: bfin_sdh: set timeout based on actual card data

The hardcoded value doesn't really work for all cards.

Signed-off-by: Cliff Cai <cliff.cai@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Cc: <linux-mmc@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 6 insertions, 2 deletions

diff --git a/drivers/mmc/host/bfin_sdh.c b/drivers/mmc/host/bfin_sdh.c
index f218a9964552..56f7b448b911 100644
--- a/drivers/mmc/host/bfin_sdh.c
+++ b/drivers/mmc/host/bfin_sdh.c
@@ -115,6 +115,7 @@ static int sdh_setup_data(struct sdh_host *host, struct mmc_data *data)
         unsigned int length;
         unsigned int data_ctl;
         unsigned int dma_cfg;
+        unsigned int cycle_ns, timeout;
 
         dev_dbg(mmc_dev(host->mmc), "%s enter flags: 0x%x\n", __func__, data->flags);
         host->data = data;
@@ -135,8 +136,11 @@ static int sdh_setup_data(struct sdh_host *host, struct mmc_data *data)
         data_ctl |= ((ffs(data->blksz) - 1) << 4);
 
         bfin_write_SDH_DATA_CTL(data_ctl);
-
-        bfin_write_SDH_DATA_TIMER(0xFFFF);
+        /* the time of a host clock period in ns */
+        cycle_ns = 1000000000 / (get_sclk() / (2 * (host->clk_div + 1)));
+        timeout = data->timeout_ns / cycle_ns;
+        timeout += data->timeout_clks;
+        bfin_write_SDH_DATA_TIMER(timeout);
         SSYNC();
 
         if (data->flags & MMC_DATA_READ) {