linux-kernel - Re: [PATCH 11/13] sdhci: Add quirk for controllers that need IRQ re-init after reset

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Message-Id: <200902131647.17728.laurentp@cse-semaphore.com>
Date:	Fri, 13 Feb 2009 16:47:13 +0100
From:	Laurent Pinchart <laurentp@...-semaphore.com>
To:	linuxppc-dev@...abs.org
Cc:	Anton Vorontsov <avorontsov@...mvista.com>,
	Pierre Ossman <drzeus-sdhci@...eus.cx>,
	Ben Dooks <ben-linux@...ff.org>, Arnd Bergmann <arnd@...db.de>,
	Liu Dave <DaveLiu@...escale.com>, linux-kernel@...r.kernel.org,
	sdhci-devel@...t.drzeus.cx
Subject: Re: [PATCH 11/13] sdhci: Add quirk for controllers that need IRQ re-init after reset

Hi Anton,

On Friday 13 February 2009 15:47:38 Anton Vorontsov wrote:
> FSL eSDHC controllers losing signal/interrupt enable states after
> reset, so we should re-enable them.
>
> Signed-off-by: Anton Vorontsov <avorontsov@...mvista.com>
> ---
>  drivers/mmc/host/sdhci.c |    7 +++++++
>  drivers/mmc/host/sdhci.h |    2 ++
>  2 files changed, 9 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
> index eff615d..b308dbf 100644
> --- a/drivers/mmc/host/sdhci.c
> +++ b/drivers/mmc/host/sdhci.c
> @@ -189,6 +189,7 @@ static void sdhci_disable_card_detection(struct
> sdhci_host *host) static void sdhci_reset(struct sdhci_host *host, u8 mask)
>  {
>  	unsigned long timeout;
> +	u32 ier = 0; /* shut up gcc */

You should use

	u32 uninitialized_var(ier);

instead to avoid generating extra code.

>
>  	if (host->quirks & SDHCI_QUIRK_NO_CARD_NO_RESET) {
>  		if (!(sdhci_readl(host, SDHCI_PRESENT_STATE) &
> @@ -196,6 +197,9 @@ static void sdhci_reset(struct sdhci_host *host, u8
> mask) return;
>  	}
>
> +	if (host->quirks & SDHCI_QUIRK_RESTORE_IRQS_AFTER_RESET)
> +		ier = sdhci_readl(host, SDHCI_INT_ENABLE);
> +
>  	sdhci_writeb(host, mask, SDHCI_SOFTWARE_RESET);
>
>  	if (mask & SDHCI_RESET_ALL)
> @@ -215,6 +219,9 @@ static void sdhci_reset(struct sdhci_host *host, u8
> mask) timeout--;
>  		mdelay(1);
>  	}
> +
> +	if (host->quirks & SDHCI_QUIRK_RESTORE_IRQS_AFTER_RESET)
> +		sdhci_clear_set_irqs(host, SDHCI_INT_ALL_MASK, ier);
>  }
>
>  static void sdhci_init(struct sdhci_host *host)
> diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
> index 44c820a..5c5a950 100644
> --- a/drivers/mmc/host/sdhci.h
> +++ b/drivers/mmc/host/sdhci.h
> @@ -229,6 +229,8 @@ struct sdhci_host {
>  #define SDHCI_QUIRK_NONSTANDARD_CLOCK			(1<<19)
>  /* Controller does not like fast PIO transfers */
>  #define SDHCI_QUIRK_PIO_NEEDS_DELAY			(1<<20)
> +/* Controller losing signal/interrupt enable states after reset */
> +#define SDHCI_QUIRK_RESTORE_IRQS_AFTER_RESET		(1<<21)
>
>  	int			irq;		/* Device IRQ */
>  	void __iomem *		ioaddr;		/* Mapped address */

-- 
Laurent Pinchart
CSE Semaphore Belgium

Chaussee de Bruxelles, 732A
B-1410 Waterloo
Belgium

T +32 (2) 387 42 59
F +32 (2) 387 42 75

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