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https://github.com/Ysurac/openmptcprouter.git
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42 lines
1.4 KiB
Diff
42 lines
1.4 KiB
Diff
From fc20eb4e650bf793bd6b3d804a63b67085c55f08 Mon Sep 17 00:00:00 2001
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From: Jonathan Bell <jonathan@raspberrypi.com>
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Date: Fri, 22 Mar 2024 14:22:55 +0000
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Subject: [PATCH 0988/1002] drivers: sdhci-brcmstb: work around mystery CQE
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CMD_IDLE_TIMER trampling
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For unknown reasons the controller seems to reset the idle polling timer
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interval on CQE enable/disable to 8 clocks which is extremely short.
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Just use the reset value in the eMMC spec (4096 clock periods which at
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200MHz is ~20uS).
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Signed-off-by: Jonathan Bell <jonathan@raspberrypi.com>
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---
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drivers/mmc/host/sdhci-brcmstb.c | 4 ++++
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1 file changed, 4 insertions(+)
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diff --git a/drivers/mmc/host/sdhci-brcmstb.c b/drivers/mmc/host/sdhci-brcmstb.c
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index e40e1d118d6b..2f5a19ea3139 100644
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--- a/drivers/mmc/host/sdhci-brcmstb.c
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+++ b/drivers/mmc/host/sdhci-brcmstb.c
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@@ -338,6 +338,7 @@ static void sdhci_brcmstb_dumpregs(struct mmc_host *mmc)
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static void sdhci_brcmstb_cqe_enable(struct mmc_host *mmc)
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{
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struct sdhci_host *host = mmc_priv(mmc);
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+ struct cqhci_host *cq_host = mmc->cqe_private;
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u32 reg;
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reg = sdhci_readl(host, SDHCI_PRESENT_STATE);
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@@ -347,6 +348,9 @@ static void sdhci_brcmstb_cqe_enable(struct mmc_host *mmc)
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}
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sdhci_cqe_enable(mmc);
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+
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+ /* Reset CMD13 polling timer back to eMMC specification default */
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+ cqhci_writel(cq_host, 0x00011000, CQHCI_SSC1);
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}
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static const struct cqhci_host_ops sdhci_brcmstb_cqhci_ops = {
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--
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2.44.0
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