From 87d96e0b65fc81f4c24eb3cc80ebf92eb99c8578 Mon Sep 17 00:00:00 2001 From: Jonathan Bell Date: Fri, 22 Mar 2024 14:22:55 +0000 Subject: [PATCH] drivers: sdhci-brcmstb: work around mystery CQE CMD_IDLE_TIMER trampling 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 --- drivers/mmc/host/sdhci-brcmstb.c | 4 ++++ 1 file changed, 4 insertions(+) --- a/drivers/mmc/host/sdhci-brcmstb.c +++ b/drivers/mmc/host/sdhci-brcmstb.c @@ -385,6 +385,7 @@ static void sdhci_brcmstb_dumpregs(struc static void sdhci_brcmstb_cqe_enable(struct mmc_host *mmc) { struct sdhci_host *host = mmc_priv(mmc); + struct cqhci_host *cq_host = mmc->cqe_private; u32 reg; reg = sdhci_readl(host, SDHCI_PRESENT_STATE); @@ -394,6 +395,9 @@ static void sdhci_brcmstb_cqe_enable(str } 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 = {