From c077c057a49d47cdc029cce654e9895ea987fce5 Mon Sep 17 00:00:00 2001 From: Kever Yang Date: Thu, 29 Aug 2019 15:42:41 +0800 Subject: [PATCH] mmc: dw_mmc: fix timeout calculate method There are two cases not been considered: - use uint for timeout, it will overflow when size bigger than 512KB for it *8*1000 at the beginning, but we may use size up to 32MB; The 'timeout' will overflow if size bigger than 51.2MB after this fix, which should be enough for U-Boot; - The timeout is using clock speed for data rate, but the device may not have such high speed, eg. clock is 52MHz while the device write speed may be less than 10MB/s, and we may use up to 150MHz clock. Fix them in this patch, the max timeout is about 6500 when size is 32MB after fix. Signed-off-by: Kever Yang --- drivers/mmc/dw_mmc.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/mmc/dw_mmc.c b/drivers/mmc/dw_mmc.c index 22f6c7e..ebe7bcd 100644 --- a/drivers/mmc/dw_mmc.c +++ b/drivers/mmc/dw_mmc.c @@ -119,11 +119,12 @@ static unsigned int dwmci_get_timeout(struct mmc *mmc, const unsigned int size) { unsigned int timeout; - timeout = size * 8 * 1000; /* counting in bits and msec */ - timeout *= 2; /* wait twice as long */ + timeout = size * 8; /* counting in bits */ + timeout *= 10; /* wait 10 times as long */ timeout /= mmc->clock; timeout /= mmc->bus_width; timeout /= mmc->ddr_mode ? 2 : 1; + timeout *= 1000; /* counting in msec */ timeout = (timeout < 1000) ? 1000 : timeout; return timeout; -- 2.7.4