[PATCH 4.4 047/115] mmc: mediatek: Fixed bug where clock frequency could be set wrong

From: Greg Kroah-Hartman
Date: Mon Dec 18 2017 - 13:06:12 EST


4.4-stable review patch. If anyone has any objections, please let me know.

------------------

From: yong mao <yong.mao@xxxxxxxxxxxx>


[ Upstream commit 40ceda09c8c84694c2ca6b00bcc6dc71e8e62d96 ]

This patch can fix two issues:

Issue 1:
In previous code, div may be overflow when setting clock frequency
as f_min. We can use DIV_ROUND_UP to fix this boundary related
issue.

Issue 2:
In previous code, we can not set the correct clock frequency when
div equals 0xff.

Signed-off-by: Yong Mao <yong.mao@xxxxxxxxxxxx>
Signed-off-by: Chaotian Jing <chaotian.jing@xxxxxxxxxxxx>
Reviewed-by: Daniel Kurtz <djkurtz@xxxxxxxxxxxx>
Signed-off-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/mmc/host/mtk-sd.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/mmc/host/mtk-sd.c
+++ b/drivers/mmc/host/mtk-sd.c
@@ -570,7 +570,7 @@ static void msdc_set_mclk(struct msdc_ho
}
}
sdr_set_field(host->base + MSDC_CFG, MSDC_CFG_CKMOD | MSDC_CFG_CKDIV,
- (mode << 8) | (div % 0xff));
+ (mode << 8) | div);
sdr_set_bits(host->base + MSDC_CFG, MSDC_CFG_CKPDN);
while (!(readl(host->base + MSDC_CFG) & MSDC_CFG_CKSTB))
cpu_relax();
@@ -1540,7 +1540,7 @@ static int msdc_drv_probe(struct platfor
host->src_clk_freq = clk_get_rate(host->src_clk);
/* Set host parameters to mmc */
mmc->ops = &mt_msdc_ops;
- mmc->f_min = host->src_clk_freq / (4 * 255);
+ mmc->f_min = DIV_ROUND_UP(host->src_clk_freq, 4 * 255);

mmc->caps |= MMC_CAP_ERASE | MMC_CAP_CMD23;
mmc->caps |= MMC_CAP_RUNTIME_RESUME;