[PATCH v2,RESEND] mmc: mtk-sd: increase the minimum bus frequency
Weijie Gao
weijie.gao at mediatek.com
Tue Apr 20 10:29:42 CEST 2021
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 at mediatek.com>
---
drivers/mmc/mtk-sd.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/mmc/mtk-sd.c b/drivers/mmc/mtk-sd.c
index 48a764be82..8599f095bc 100644
--- a/drivers/mmc/mtk-sd.c
+++ b/drivers/mmc/mtk-sd.c
@@ -232,6 +232,8 @@
#define SCLK_CYCLES_SHIFT 20
+#define MIN_BUS_CLK 200000
+
#define CMD_INTS_MASK \
(MSDC_INT_CMDRDY | MSDC_INT_RSPCRCERR | MSDC_INT_CMDTMO)
@@ -1639,6 +1641,9 @@ static int msdc_drv_probe(struct udevice *dev)
else
cfg->f_min = host->src_clk_freq / (4 * 4095);
+ if (cfg->f_min < MIN_BUS_CLK)
+ cfg->f_min = MIN_BUS_CLK;
+
if (cfg->f_max < cfg->f_min || cfg->f_max > host->src_clk_freq)
cfg->f_max = host->src_clk_freq;
--
2.17.1
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