[PATCH 2/2] mmc: sdhci-of-dwcmshc: reduce CIT for better performance

[Shawn Lin]

在 2025/11/12 星期三 15:44, Shawn Lin 写道:
> CQHCI_SSC1.CIT indicates to the CQE the polling period to use for
> periodic SEND_QUEUE_STATUS (CMD13) polling. Some eMMCs have only one
> hardware queue, and CMD13 can only query one slot at a time for data
> transmission, which cannot be processed in parallel. Modifying the
> CMD13 query interval can increase the query frequency and improve
> random write performance.
> 

Ping...

Adrain acked these two patches, so will them be candidates for 6.19
given the merge windows is coming soon?

> Signed-off-by: Shawn Lin <shawn.lin at rock-chips.com>
> ---
> 
>   drivers/mmc/host/cqhci.h            | 1 +
>   drivers/mmc/host/sdhci-of-dwcmshc.c | 5 +++++
>   2 files changed, 6 insertions(+)
> 
> diff --git a/drivers/mmc/host/cqhci.h b/drivers/mmc/host/cqhci.h
> index ce189a1..3668856 100644
> --- a/drivers/mmc/host/cqhci.h
> +++ b/drivers/mmc/host/cqhci.h
> @@ -93,6 +93,7 @@
>   /* send status config 1 */
>   #define CQHCI_SSC1			0x40
>   #define CQHCI_SSC1_CBC_MASK		GENMASK(19, 16)
> +#define CQHCI_SSC1_CIT_MASK		GENMASK(15, 0)
>   
>   /* send status config 2 */
>   #define CQHCI_SSC2			0x44
> diff --git a/drivers/mmc/host/sdhci-of-dwcmshc.c b/drivers/mmc/host/sdhci-of-dwcmshc.c
> index e276a4e..cad5165 100644
> --- a/drivers/mmc/host/sdhci-of-dwcmshc.c
> +++ b/drivers/mmc/host/sdhci-of-dwcmshc.c
> @@ -631,6 +631,11 @@ static void rk35xx_sdhci_cqe_pre_enable(struct mmc_host *mmc)
>   	struct dwcmshc_priv *dwc_priv = sdhci_pltfm_priv(pltfm_host);
>   	u32 reg;
>   
> +	/* Set Send Status Command Idle Timer to 10.66us (256 * 1 / 24) */
> +	reg = sdhci_readl(host, dwc_priv->vendor_specific_area2 + CQHCI_SSC1);
> +	reg = (reg & ~CQHCI_SSC1_CIT_MASK) | 0x0100;
> +	sdhci_writel(host, reg, dwc_priv->vendor_specific_area2 + CQHCI_SSC1);
> +
>   	reg = sdhci_readl(host, dwc_priv->vendor_specific_area2 + CQHCI_CFG);
>   	reg |= CQHCI_ENABLE;
>   	sdhci_writel(host, reg, dwc_priv->vendor_specific_area2 + CQHCI_CFG);