Hi Yong, On Sat, Mar 4, 2017 at 3:10 PM, Yong Mao <yong.mao@xxxxxxxxxxxx> wrote: > From: yong mao <yong.mao@xxxxxxxxxxxx> > > 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> > --- > drivers/mmc/host/mtk-sd.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/drivers/mmc/host/mtk-sd.c b/drivers/mmc/host/mtk-sd.c > index 07f3236..3ad5228 100644 > --- a/drivers/mmc/host/mtk-sd.c > +++ b/drivers/mmc/host/mtk-sd.c > @@ -591,7 +591,7 @@ static void msdc_set_mclk(struct msdc_host *host, unsigned char timing, u32 hz) > } > } > 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(); > @@ -1692,7 +1692,7 @@ static int msdc_drv_probe(struct platform_device *pdev) > 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 core transfer sizes tunable parameters */ > -- > 1.7.9.5 > -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
