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    Subject[PATCH 5.15 42/73] mmc: mtk-sd: Clear interrupts when cqe off/disable
    Date
    From: Wenbin Mei <wenbin.mei@mediatek.com>

    [ Upstream commit cc5d1692600613e72f32af60e27330fe0c79f4fe ]

    Currently we don't clear MSDC interrupts when cqe off/disable, which led
    to the data complete interrupt will be reserved for the next command.
    If the next command with data transfer after cqe off/disable, we process
    the CMD ready interrupt and trigger DMA start for data, but the data
    complete interrupt is already exists, then SW assume that the data transfer
    is complete, SW will trigger DMA stop, but the data may not be transmitted
    yet or is transmitting, so we may encounter the following error:
    mtk-msdc 11230000.mmc: CMD bus busy detected.

    Signed-off-by: Wenbin Mei <wenbin.mei@mediatek.com>
    Fixes: 88bd652b3c74 ("mmc: mediatek: command queue support")
    Cc: stable@vger.kernel.org
    Link: https://lore.kernel.org/r/20220728080048.21336-1-wenbin.mei@mediatek.com
    Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    drivers/mmc/host/mtk-sd.c | 6 ++++++
    1 file changed, 6 insertions(+)

    diff --git a/drivers/mmc/host/mtk-sd.c b/drivers/mmc/host/mtk-sd.c
    index f9b2897569bb4..99d8881a7d6c2 100644
    --- a/drivers/mmc/host/mtk-sd.c
    +++ b/drivers/mmc/host/mtk-sd.c
    @@ -2345,6 +2345,9 @@ static void msdc_cqe_disable(struct mmc_host *mmc, bool recovery)
    /* disable busy check */
    sdr_clr_bits(host->base + MSDC_PATCH_BIT1, MSDC_PB1_BUSY_CHECK_SEL);

    + val = readl(host->base + MSDC_INT);
    + writel(val, host->base + MSDC_INT);
    +
    if (recovery) {
    sdr_set_field(host->base + MSDC_DMA_CTRL,
    MSDC_DMA_CTRL_STOP, 1);
    @@ -2785,11 +2788,14 @@ static int __maybe_unused msdc_suspend(struct device *dev)
    {
    struct mmc_host *mmc = dev_get_drvdata(dev);
    int ret;
    + u32 val;

    if (mmc->caps2 & MMC_CAP2_CQE) {
    ret = cqhci_suspend(mmc);
    if (ret)
    return ret;
    + val = readl(((struct msdc_host *)mmc_priv(mmc))->base + MSDC_INT);
    + writel(val, ((struct msdc_host *)mmc_priv(mmc))->base + MSDC_INT);
    }

    return pm_runtime_force_suspend(dev);
    --
    2.35.1


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