linux-kernel - Re: [PATCH] mmc: sdhci-pci-gli: Finetune GL9763E L1 Entry Delay

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Date:   Wed, 30 Jun 2021 15:19:54 +0300
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Renius Chen <reniuschengl@...il.com>, ulf.hansson@...aro.org
Cc:     linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
        Ben.Chuang@...esyslogic.com.tw
Subject: Re: [PATCH] mmc: sdhci-pci-gli: Finetune GL9763E L1 Entry Delay

On 24/06/21 5:56 am, Renius Chen wrote:
> Finetune the L1 entry delay to 20us for better balance of performance and
> battery life.
> 
> Signed-off-by: Renius Chen <reniuschengl@...il.com>

Acked-by: Adrian Hunter <adrian.hunter@...el.com>

> ---
>  drivers/mmc/host/sdhci-pci-gli.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/mmc/host/sdhci-pci-gli.c b/drivers/mmc/host/sdhci-pci-gli.c
> index 302a7579a9b3..4e3c0561354d 100644
> --- a/drivers/mmc/host/sdhci-pci-gli.c
> +++ b/drivers/mmc/host/sdhci-pci-gli.c
> @@ -90,7 +90,7 @@
>  
>  #define PCIE_GLI_9763E_CFG2      0x8A4
>  #define   GLI_9763E_CFG2_L1DLY     GENMASK(28, 19)
> -#define   GLI_9763E_CFG2_L1DLY_MID 0x54
> +#define   GLI_9763E_CFG2_L1DLY_MID 0x50
>  
>  #define PCIE_GLI_9763E_MMC_CTRL  0x960
>  #define   GLI_9763E_HS400_SLOW     BIT(3)
> @@ -810,7 +810,7 @@ static void gli_set_gl9763e(struct sdhci_pci_slot *slot)
>  
>  	pci_read_config_dword(pdev, PCIE_GLI_9763E_CFG2, &value);
>  	value &= ~GLI_9763E_CFG2_L1DLY;
> -	/* set ASPM L1 entry delay to 21us */
> +	/* set ASPM L1 entry delay to 20us */
>  	value |= FIELD_PREP(GLI_9763E_CFG2_L1DLY, GLI_9763E_CFG2_L1DLY_MID);
>  	pci_write_config_dword(pdev, PCIE_GLI_9763E_CFG2, value);
>  
>