linux-kernel - Re: [PATCH] mmc: sdhci-pci-gli: Reduce power consumption for GL9755

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Date:   Tue, 24 Nov 2020 15:25:29 +0100
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Ben Chuang <benchuanggli@...il.com>
Cc:     Adrian Hunter <adrian.hunter@...el.com>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Ben Chuang <ben.chuang@...esyslogic.com.tw>
Subject: Re: [PATCH] mmc: sdhci-pci-gli: Reduce power consumption for GL9755

On Mon, 23 Nov 2020 at 06:38, Ben Chuang <benchuanggli@...il.com> wrote:
>
> From: Ben Chuang <ben.chuang@...esyslogic.com.tw>
>
> For GL9755, reduce power consumption by lowering the LFCLK and disabling
> the DMACLK on low-power.
>
> Signed-off-by: Ben Chuang <ben.chuang@...esyslogic.com.tw>

Applied for next, thanks!

Kind regards
Uffe


> ---
>  drivers/mmc/host/sdhci-pci-gli.c | 20 ++++++++++++++++++++
>  1 file changed, 20 insertions(+)
>
> diff --git a/drivers/mmc/host/sdhci-pci-gli.c b/drivers/mmc/host/sdhci-pci-gli.c
> index 9887485a4134..f10bdfbfce36 100644
> --- a/drivers/mmc/host/sdhci-pci-gli.c
> +++ b/drivers/mmc/host/sdhci-pci-gli.c
> @@ -97,6 +97,10 @@
>  #define   GLI_9755_WT_EN_ON     0x1
>  #define   GLI_9755_WT_EN_OFF    0x0
>
> +#define PCI_GLI_9755_PECONF   0x44
> +#define   PCI_GLI_9755_LFCLK    GENMASK(14, 12)
> +#define   PCI_GLI_9755_DMACLK   BIT(29)
> +
>  #define PCI_GLI_9755_PLL            0x64
>  #define   PCI_GLI_9755_PLL_LDIV       GENMASK(9, 0)
>  #define   PCI_GLI_9755_PLL_PDIV       GENMASK(14, 12)
> @@ -519,6 +523,21 @@ static void sdhci_gl9755_set_clock(struct sdhci_host *host, unsigned int clock)
>         sdhci_enable_clk(host, clk);
>  }
>
> +static void gl9755_hw_setting(struct sdhci_pci_slot *slot)
> +{
> +       struct pci_dev *pdev = slot->chip->pdev;
> +       u32 value;
> +
> +       gl9755_wt_on(pdev);
> +
> +       pci_read_config_dword(pdev, PCI_GLI_9755_PECONF, &value);
> +       value &= ~PCI_GLI_9755_LFCLK;
> +       value &= ~PCI_GLI_9755_DMACLK;
> +       pci_write_config_dword(pdev, PCI_GLI_9755_PECONF, value);
> +
> +       gl9755_wt_off(pdev);
> +}
> +
>  static int gli_probe_slot_gl9750(struct sdhci_pci_slot *slot)
>  {
>         struct sdhci_host *host = slot->host;
> @@ -534,6 +553,7 @@ static int gli_probe_slot_gl9755(struct sdhci_pci_slot *slot)
>  {
>         struct sdhci_host *host = slot->host;
>
> +       gl9755_hw_setting(slot);
>         gli_pcie_enable_msi(slot);
>         slot->host->mmc->caps2 |= MMC_CAP2_NO_SDIO;
>         sdhci_enable_v4_mode(host);
> --
> 2.29.2
>