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drivers: sdhci-brcmstb: work around mystery CQE CMD_IDLE_TIMER trampling

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For unknown reasons the controller seems to reset the idle polling timer
interval on CQE enable/disable to 8 clocks which is extremely short.

Just use the reset value in the eMMC spec (4096 clock periods which at
200MHz is ~20uS).

Signed-off-by: Jonathan Bell <jonathan@raspberrypi.com>
This commit is contained in:
Jonathan Bell
2024-03-22 14:22:55 +00:00
committed by Dom Cobley
parent 76acefcafd
commit 29849da6dc
1 changed files with 4 additions and 0 deletions
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4
drivers/mmc/host/sdhci-brcmstb.c
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@@ -385,6 +385,7 @@ static void sdhci_brcmstb_dumpregs(struct mmc_host *mmc)
static void sdhci_brcmstb_cqe_enable(struct mmc_host *mmc) static void sdhci_brcmstb_cqe_enable(struct mmc_host *mmc)
{ {
struct sdhci_host *host = mmc_priv(mmc); struct sdhci_host *host = mmc_priv(mmc);
struct cqhci_host *cq_host = mmc->cqe_private;
u32 reg; u32 reg;
reg = sdhci_readl(host, SDHCI_PRESENT_STATE); reg = sdhci_readl(host, SDHCI_PRESENT_STATE);
@@ -394,6 +395,9 @@ static void sdhci_brcmstb_cqe_enable(struct mmc_host *mmc)
} }
sdhci_cqe_enable(mmc); sdhci_cqe_enable(mmc);
/* Reset CMD13 polling timer back to eMMC specification default */
cqhci_writel(cq_host, 0x00011000, CQHCI_SSC1);
} }
static const struct cqhci_host_ops sdhci_brcmstb_cqhci_ops = { static const struct cqhci_host_ops sdhci_brcmstb_cqhci_ops = {