summaryrefslogtreecommitdiff
path: root/drivers/mmc
diff options
context:
space:
mode:
authorChun-Hung Wu <chun-hung.wu@mediatek.com>2020-07-20 03:42:37 +0300
committerUlf Hansson <ulf.hansson@linaro.org>2020-07-24 13:53:33 +0300
commit557011b6b8c87c10d8bd2ec4366d4b2a0614ffc8 (patch)
tree21425d96b6ac7cf9f23ceeb5e2b920befaa46a76 /drivers/mmc
parent7d176b0ea6f0d45e32564770316df6671183136e (diff)
downloadlinux-557011b6b8c87c10d8bd2ec4366d4b2a0614ffc8.tar.xz
mmc: mediatek: refine msdc timeout api
Extract msdc timeout api common part to have better code architecture and avoid redundant code. Signed-off-by: Chun-Hung Wu <chun-hung.wu@mediatek.com> Reviewed-by: Matthias Brugger <matthias.bgg@gmail.com> Link: https://lore.kernel.org/r/1595205759-5825-3-git-send-email-chun-hung.wu@mediatek.com Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers/mmc')
-rw-r--r--drivers/mmc/host/mtk-sd.c32
1 files changed, 22 insertions, 10 deletions
diff --git a/drivers/mmc/host/mtk-sd.c b/drivers/mmc/host/mtk-sd.c
index d23f738b9cb7..933a09853908 100644
--- a/drivers/mmc/host/mtk-sd.c
+++ b/drivers/mmc/host/mtk-sd.c
@@ -723,21 +723,21 @@ static void msdc_unprepare_data(struct msdc_host *host, struct mmc_request *mrq)
}
}
-/* clock control primitives */
-static void msdc_set_timeout(struct msdc_host *host, u32 ns, u32 clks)
+static u64 msdc_timeout_cal(struct msdc_host *host, u64 ns, u64 clks)
{
- u32 timeout, clk_ns;
+ u64 timeout, clk_ns;
u32 mode = 0;
- host->timeout_ns = ns;
- host->timeout_clks = clks;
if (host->mmc->actual_clock == 0) {
timeout = 0;
} else {
- clk_ns = 1000000000UL / host->mmc->actual_clock;
- timeout = (ns + clk_ns - 1) / clk_ns + clks;
+ clk_ns = 1000000000ULL;
+ do_div(clk_ns, host->mmc->actual_clock);
+ timeout = ns + clk_ns - 1;
+ do_div(timeout, clk_ns);
+ timeout += clks;
/* in 1048576 sclk cycle unit */
- timeout = (timeout + (0x1 << 20) - 1) >> 20;
+ timeout = DIV_ROUND_UP(timeout, (0x1 << 20));
if (host->dev_comp->clk_div_bits == 8)
sdr_get_field(host->base + MSDC_CFG,
MSDC_CFG_CKMOD, &mode);
@@ -747,9 +747,21 @@ static void msdc_set_timeout(struct msdc_host *host, u32 ns, u32 clks)
/*DDR mode will double the clk cycles for data timeout */
timeout = mode >= 2 ? timeout * 2 : timeout;
timeout = timeout > 1 ? timeout - 1 : 0;
- timeout = timeout > 255 ? 255 : timeout;
}
- sdr_set_field(host->base + SDC_CFG, SDC_CFG_DTOC, timeout);
+ return timeout;
+}
+
+/* clock control primitives */
+static void msdc_set_timeout(struct msdc_host *host, u64 ns, u64 clks)
+{
+ u64 timeout;
+
+ host->timeout_ns = ns;
+ host->timeout_clks = clks;
+
+ timeout = msdc_timeout_cal(host, ns, clks);
+ sdr_set_field(host->base + SDC_CFG, SDC_CFG_DTOC,
+ (u32)(timeout > 255 ? 255 : timeout));
}
static void msdc_gate_clock(struct msdc_host *host)