1 From 1d4fcea788e579934a1ad0a90cecd6e1761127d1 Mon Sep 17 00:00:00 2001
2 From: Weijie Gao <weijie.gao@mediatek.com>
3 Date: Tue, 2 Mar 2021 15:56:17 +0800
4 Subject: [PATCH 03/12] mmc: mtk-sd: increase the minimum bus frequency
6 With a 48MHz input clock, the lowest bus frequency can be as low as
7 48000000 / (4 * 4095) = 2930Hz. Such an extremely low frequency will cause
8 the mmc framework take seconds to finish the initialization.
10 Limiting the minimum bus frequency to a slightly higher value can solve the
11 issue without any side effects.
13 Signed-off-by: Weijie Gao <weijie.gao@mediatek.com>
15 drivers/mmc/mtk-sd.c | 2 +-
16 1 file changed, 1 insertion(+), 1 deletion(-)
18 --- a/drivers/mmc/mtk-sd.c
19 +++ b/drivers/mmc/mtk-sd.c
22 #define SCLK_CYCLES_SHIFT 20
24 -#define MIN_BUS_CLK 200000
25 +#define MIN_BUS_CLK 260000
27 #define CMD_INTS_MASK \
28 (MSDC_INT_CMDRDY | MSDC_INT_RSPCRCERR | MSDC_INT_CMDTMO)