On 2016-11-22 7:36 PM, Jisheng Zhang wrote:
On Tue, 22 Nov 2016 17:09:48 -0800 Jeremy McNicoll <jeremymc@xxxxxxxxxx> wrote:On msm8992 it has been observed that IRQs were not getting ACK'd correctly when clocked at speeds greater than 400KHz. Signed-off-by: Jeremy McNicoll <jeremymc@xxxxxxxxxx> --- drivers/mmc/host/sdhci-msm.c | 7 +++++++ drivers/mmc/host/sdhci.c | 12 ++++++++++-- drivers/mmc/host/sdhci.h | 2 ++ 3 files changed, 19 insertions(+), 2 deletions(-) diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c index 1fcda96..459003c 100644 --- a/drivers/mmc/host/sdhci-msm.c +++ b/drivers/mmc/host/sdhci-msm.c @@ -1303,6 +1303,13 @@ static int sdhci_msm_probe(struct platform_device *pdev) CORE_VENDOR_SPEC_CAPABILITIES0); } + /* Enable delayed IRQ handling workaround on 8992 */ + if (core_major == 1 && core_minor == 0x3e) { + /* Add 40us delay in interrupt handler when operating + * at initialization frequency of 400KHz. */ + host->quirks2 |= SDHCI_QUIRK2_SLOW_INT_CLR; + } + /* Setup IRQ for handling power/voltage tasks with PMIC */ msm_host->pwr_irq = platform_get_irq_byname(pdev, "pwr_irq"); if (msm_host->pwr_irq < 0) { diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index 5911f98..c1aae22 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -2703,11 +2703,19 @@ static irqreturn_t sdhci_irq(int irq, void *dev_id) result = IRQ_WAKE_THREAD; } - if (intmask & SDHCI_INT_CMD_MASK) + if (intmask & SDHCI_INT_CMD_MASK) { + if ((host->quirks2 & SDHCI_QUIRK2_SLOW_INT_CLR) && (host->clock <= 400000)) { + udelay(40); + } sdhci_cmd_irq(host, intmask & SDHCI_INT_CMD_MASK); + } - if (intmask & SDHCI_INT_DATA_MASK) + if (intmask & SDHCI_INT_DATA_MASK) { + if ((host->quirks2 & SDHCI_QUIRK2_SLOW_INT_CLR) && (host->clock <= 400000)) { + udelay(40); + } sdhci_data_irq(host, intmask & SDHCI_INT_DATA_MASK); + } if (intmask & SDHCI_INT_BUS_POWER) pr_err("%s: Card is consuming too much power!\n", diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h index c055e24..5f8301e 100644 --- a/drivers/mmc/host/sdhci.h +++ b/drivers/mmc/host/sdhci.h @@ -24,6 +24,8 @@ * Controller registers */ +#define SDHCI_QUIRK2_SLOW_INT_CLR (1<<5)IIRC, new quirk isn't allowed now.
Why not? -jeremy
Thanks, Jisheng -- To unsubscribe from this list: send the line "unsubscribe linux-arm-msm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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