[PATCH 3/3] mmc: bfin_sdh: set timeout based on actual card data

Mike Frysinger
2010-01-19T08:02:37Z

From: Cliff Cai <cliff.cai@analog.com>

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>
---
drivers/mmc/host/bfin_sdh.c | 8 ++++++--
1 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/mmc/host/bfin_sdh.c b/drivers/mmc/host/bfin_sdh.c
index f218a99..56f7b44 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) {
--
1.6.6