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From 1d4fcea788e579934a1ad0a90cecd6e1761127d1 Mon Sep 17 00:00:00 2001
From: Weijie Gao <weijie.gao@mediatek.com>
Date: Tue, 2 Mar 2021 15:56:17 +0800
Subject: [PATCH 03/12] mmc: mtk-sd: increase the minimum bus frequency
With a 48MHz input clock, the lowest bus frequency can be as low as
48000000 / (4 * 4095) = 2930Hz. Such an extremely low frequency will cause
the mmc framework take seconds to finish the initialization.
Limiting the minimum bus frequency to a slightly higher value can solve the
issue without any side effects.
Signed-off-by: Weijie Gao <weijie.gao@mediatek.com>
---
drivers/mmc/mtk-sd.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/mmc/mtk-sd.c
+++ b/drivers/mmc/mtk-sd.c
@@ -232,7 +232,7 @@
#define SCLK_CYCLES_SHIFT 20
-#define MIN_BUS_CLK 200000
+#define MIN_BUS_CLK 260000
#define CMD_INTS_MASK \
(MSDC_INT_CMDRDY | MSDC_INT_RSPCRCERR | MSDC_INT_CMDTMO)
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