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    Subject[PATCH v2] mmc: mtk-sd: reduce CIT for better performance
    Date
    CQHCI_SSC1 indicates to CQE the polling period to use when using periodic
    SEND_QUEUE_STATUS(CMD13) polling.
    The default value 0x1000 that corresponds to 150us, let's decrease it to
    0x40 that corresponds to 3us, which can improve the performance of some
    eMMC devices.

    Signed-off-by: Wenbin Mei <wenbin.mei@mediatek.com>
    ---
    drivers/mmc/host/mtk-sd.c | 4 ++++
    1 file changed, 4 insertions(+)

    diff --git a/drivers/mmc/host/mtk-sd.c b/drivers/mmc/host/mtk-sd.c
    index edade0e54a0c..ffeccddcd028 100644
    --- a/drivers/mmc/host/mtk-sd.c
    +++ b/drivers/mmc/host/mtk-sd.c
    @@ -2453,6 +2453,7 @@ static void msdc_hs400_enhanced_strobe(struct mmc_host *mmc,
    static void msdc_cqe_enable(struct mmc_host *mmc)
    {
    struct msdc_host *host = mmc_priv(mmc);
    + struct cqhci_host *cq_host = mmc->cqe_private;

    /* enable cmdq irq */
    writel(MSDC_INT_CMDQ, host->base + MSDC_INTEN);
    @@ -2462,6 +2463,9 @@ static void msdc_cqe_enable(struct mmc_host *mmc)
    msdc_set_busy_timeout(host, 20 * 1000000000ULL, 0);
    /* default read data timeout 1s */
    msdc_set_timeout(host, 1000000000ULL, 0);
    +
    + /* decrease the send status command idle timer to 3us */
    + cqhci_writel(cq_host, 0x40, CQHCI_SSC1);
    }

    static void msdc_cqe_disable(struct mmc_host *mmc, bool recovery)
    --
    2.25.1
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