linux-kernel - Re: [PATCH 01/10] mmc: sdhci: Add quirk SDHCI_QUIRK2_SET_BUS

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Date:   Fri, 6 Mar 2020 14:34:30 +0200
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Nicolas Saenz Julienne <nsaenzjulienne@...e.de>,
        devicetree@...r.kernel.org, bcm-kernel-feedback-list@...adcom.com,
        linux-rpi-kernel@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-mmc@...r.kernel.org
Cc:     ulf.hansson@...aro.org, f.fainelli@...il.com, phil@...pberrypi.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 01/10] mmc: sdhci: Add quirk SDHCI_QUIRK2_SET_BUS_VOLTAGE

On 6/03/20 12:38 pm, Nicolas Saenz Julienne wrote:
> Adds quirk for controllers whose bus power select register has to be set
> even when powering SD cards from a regulator.
> 
> Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
> ---
>  drivers/mmc/host/sdhci.c | 5 +++++
>  drivers/mmc/host/sdhci.h | 2 ++
>  2 files changed, 7 insertions(+)
> 
> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
> index c59566363a42..c7fd87447457 100644
> --- a/drivers/mmc/host/sdhci.c
> +++ b/drivers/mmc/host/sdhci.c
> @@ -1920,6 +1920,11 @@ static void sdhci_set_power_reg(struct sdhci_host *host, unsigned char mode,
>  
>  	mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd);
>  
> +	if (host->quirks2 & SDHCI_QUIRK2_SET_BUS_VOLTAGE) {

We don't really want to replace callbacks by quirks.

Replace sdhci_milbeaut_set_power() etc by a common fn in sdhci.c if you want.

> +		sdhci_set_power_noreg(host, mode, vdd);
> +		return;
> +	}
> +
>  	if (mode != MMC_POWER_OFF)
>  		sdhci_writeb(host, SDHCI_POWER_ON, SDHCI_POWER_CONTROL);
>  	else
> diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
> index cac2d97782e6..9531a4e5b148 100644
> --- a/drivers/mmc/host/sdhci.h
> +++ b/drivers/mmc/host/sdhci.h
> @@ -484,6 +484,8 @@ struct sdhci_host {
>   * block count.
>   */
>  #define SDHCI_QUIRK2_USE_32BIT_BLK_CNT			(1<<18)
> +/* Set bus voltage even when powering from an external regulator */
> +#define SDHCI_QUIRK2_SET_BUS_VOLTAGE			(1<<19)
>  
>  	int irq;		/* Device IRQ */
>  	void __iomem *ioaddr;	/* Mapped address */
>