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https://github.com/libretro/Lakka-LibreELEC.git
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50 lines
1.6 KiB
Diff
50 lines
1.6 KiB
Diff
From: Da Xue <da@libre.computer>
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Date: Thu, 21 Jul 2022 18:08:21 -0400
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Some users experienced problems booting u-boot from SPL hanging here:
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Trying to boot from MMC1 or Trying to boot from MMC2
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This seems to occur with both MicroSD and eMMC modules on ALL-H3-CC.
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Increasing the delay after mmc reset fixes these boot problems.
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Some MicroSD cards are impacted more than others so it is possible that
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MicroSD internals need time to stabilize. Below is some failure data.
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sandisk ultra 64gb 9/20 with 1ms, 20/20 with 10ms
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sandisk ultra 16gb 2/20 with 1ms, 20/20 with 10ms
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sandisk extreme 16gb 6/20 with 10ms, 20/20 with 20ms
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A quick comparison of schematics show series resistors for ESD
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protection on the MicroSD GPIOs not present on all H3/H5 boards.
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It is not known if this is related to the issue.
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This patch adds a fixed 20ms delay to mmc init to mitigate the problem.
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If boot time optimization is required and the platform does not require
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the delay. The delay can be replaced with:
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writel(SUNXI_MMC_GCTRL_RESET, &priv->reg->gctrl);
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if (wait_for_bit_le32( &priv->reg->gctrl,
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SUNXI_MMC_GCTRL_RESET, false, 20, false)) {
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printf("%s: Timeout\n", __func__);
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return -ETIMEDOUT;
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}
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Signed-off-by: Da Xue <da@libre.computer>
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---
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drivers/mmc/sunxi_mmc.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/drivers/mmc/sunxi_mmc.c b/drivers/mmc/sunxi_mmc.c
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index 1bb7b6d0e9..f7942b69ce 100644
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--- a/drivers/mmc/sunxi_mmc.c
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+++ b/drivers/mmc/sunxi_mmc.c
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@@ -297,7 +297,7 @@ static int sunxi_mmc_core_init(struct mmc *mmc)
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/* Reset controller */
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writel(SUNXI_MMC_GCTRL_RESET, &priv->reg->gctrl);
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- udelay(1000);
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+ udelay(20000);
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return 0;
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}
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