linux-kernel - RE: [RFC PATCH 10/21] mmc: sdhci: remove SDHCI_QUIRK_BROKEN_CARD

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Message-ID: <DB3PR04MB055320DCE3EED80B3837D0C190D90@DB3PR04MB0553.eurprd04.prod.outlook.com>
Date:	Wed, 27 Jan 2016 07:11:23 +0000
From:	Haibo Chen <haibo.chen@....com>
To:	Shawn Lin <shawn.lin@...k-chips.com>,
	Ulf Hansson <ulf.hansson@...aro.org>
CC:	"bcm-kernel-feedback-list@...adcom.com" 
	<bcm-kernel-feedback-list@...adcom.com>,
	"linux-rpi-kernel@...ts.infradead.org" 
	<linux-rpi-kernel@...ts.infradead.org>,
	"linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [RFC PATCH 10/21] mmc: sdhci: remove
 SDHCI_QUIRK_BROKEN_CARD_DETECTION



Hi Shawn,


> -----Original Message-----
> From: linux-mmc-owner@...r.kernel.org [mailto:linux-mmc-
> owner@...r.kernel.org] On Behalf Of Shawn Lin
> Sent: Wednesday, January 27, 2016 1:08 PM
> To: Ulf Hansson <ulf.hansson@...aro.org>
> Cc: bcm-kernel-feedback-list@...adcom.com; linux-rpi-
> kernel@...ts.infradead.org; linux-mmc@...r.kernel.org; linux-
> kernel@...r.kernel.org; Shawn Lin <shawn.lin@...k-chips.com>
> Subject: [RFC PATCH 10/21] mmc: sdhci: remove
> SDHCI_QUIRK_BROKEN_CARD_DETECTION
> 
> SDHCI_QUIRK_BROKEN_CARD_DETECTION is for "broken-cd".
> If we add MMC_CAP_NONREMOVABLE("non-removeble"), we shoud not add
> "broken-cd" together according to mmc.txt for dt-bingdings. Also, "broken-cd"
> can obtain from mmc_of_parse, which will add MMC_CAP_NEEDS_POLL into
> mmc->caps.
> 
> Signed-off-by: Shawn Lin <shawn.lin@...k-chips.com>
> ---
> 
>  drivers/mmc/host/sdhci.c | 14 +++++---------
>  1 file changed, 5 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index
> d622435..b208cb7 100644
> --- a/drivers/mmc/host/sdhci.c
> +++ b/drivers/mmc/host/sdhci.c
> @@ -145,7 +145,7 @@ static void sdhci_set_card_detection(struct sdhci_host
> *host, bool enable)  {
>  	u32 present;
> 
> -	if ((host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION) ||
> +	if ((host->mmc->caps & MMC_CAP_NEEDS_POLL) ||
>  	    (host->mmc->caps & MMC_CAP_NONREMOVABLE))
>  		return;
> 
> @@ -1618,7 +1618,8 @@ static int sdhci_do_get_cd(struct sdhci_host *host)
>  		return 0;
> 
>  	/* If nonremovable, assume that the card is always present. */
> -	if (host->mmc->caps & MMC_CAP_NONREMOVABLE)
> +	if (host->mmc->caps & MMC_CAP_NONREMOVABLE ||
> +	    host->mmc->caps & MMC_CAP_NEEDS_POLL)
>  		return 1;
> 
>  	/*
> @@ -1628,10 +1629,6 @@ static int sdhci_do_get_cd(struct sdhci_host *host)
>  	if (!IS_ERR_VALUE(gpio_cd))
>  		return !!gpio_cd;
> 
> -	/* If polling, assume that the card is always present. */
> -	if (host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION)
> -		return 1;

Why simply  remove these code rather than use this:
If(host->mmc->caps & MMC_CAP_NEEDS_POLL)
       Return 1;

According to the comment, if polling, need to return 1,
But if you just simply remove this code, it will read the sdhci register SDHCI_PRESENT_STATE


Best Regards

Haibo Chen

> -
>  	/* Host native card detect */
>  	return !!(sdhci_readl(host, SDHCI_PRESENT_STATE) &
> SDHCI_CARD_PRESENT);  } @@ -2658,7 +2655,7 @@ void
> sdhci_enable_irq_wakeups(struct sdhci_host *host)
>  	val = sdhci_readb(host, SDHCI_WAKE_UP_CONTROL);
>  	val |= mask ;
>  	/* Avoid fake wake up */
> -	if (host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION)
> +	if (host->mmc->caps & MMC_CAP_NEEDS_POLL)
>  		val &= ~(SDHCI_WAKE_ON_INSERT |
> SDHCI_WAKE_ON_REMOVE);
>  	sdhci_writeb(host, val, SDHCI_WAKE_UP_CONTROL);  } @@ -3112,8
> +3109,7 @@ int sdhci_add_host(struct sdhci_host *host)
>  	if (caps[0] & SDHCI_CAN_DO_HISPD)
>  		mmc->caps |= MMC_CAP_SD_HIGHSPEED |
> MMC_CAP_MMC_HIGHSPEED;
> 
> -	if ((host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION) &&
> -	    !(mmc->caps & MMC_CAP_NONREMOVABLE) &&
> +	if (!(mmc->caps & MMC_CAP_NONREMOVABLE) &&
>  	    IS_ERR_VALUE(mmc_gpio_get_cd(host->mmc)))
>  		mmc->caps |= MMC_CAP_NEEDS_POLL;
> 
> --
> 2.3.7
> 
> 
> --
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