linux-kernel - Re: [PATCH 09/18] ide: add ->set

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Date:	Wed, 15 Oct 2008 16:20:07 +0400
From:	Sergei Shtylyov <sshtylyov@...mvista.com>
To:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
Cc:	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 09/18] ide: add ->set_irq method

Hello.

Bartlomiej Zolnierkiewicz wrote:

> Add ->set_irq method for setting nIEN bit of ATA Device Control
> register and use it instead of ide_set_irq().
>
> While at it:
>
> * Use ->set_irq in init_irq() and do_reset1().
>
> * Don't use HWIF() macro in ide_check_pm_state().
>
> There should be no functional changes caused by this patch.
>
> Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
>   
[...]
> Index: b/drivers/ide/ide-iops.c
> ===================================================================
> --- a/drivers/ide/ide-iops.c
> +++ b/drivers/ide/ide-iops.c
> @@ -135,6 +135,23 @@ static u8 ide_read_sff_dma_status(ide_hw
>  		return inb(hwif->dma_base + ATA_DMA_STATUS);
>  }
>  
> +static void ide_set_irq(ide_hwif_t *hwif, int on)
> +{
> +	u8 ctl = ATA_DEVCTL_OBS;
> +
> +	if (on == 4) { /* hack for SRST */
> +		ctl |= 4;
> +		on &= ~4;
> +	}
> +
> +	ctl |= on ? 0 : 2;
> +
> +	if (hwif->host_flags & IDE_HFLAG_MMIO)
> +		writeb(ctl, (void __iomem *)hwif->io_ports.ctl_addr);
> +	else
> +		outb(ctl, hwif->io_ports.ctl_addr);
> +}
> +
>  static void ide_tf_load(ide_drive_t *drive, ide_task_t *task)
>  {
>  	ide_hwif_t *hwif = drive->hwif;
>   
[...]
> @@ -1162,16 +1180,15 @@ static ide_startstop_t do_reset1 (ide_dr
>  	 * immediate interrupt due to the edge transition it produces.
>  	 * This single interrupt gives us a "fast poll" for drives that
>  	 * recover from reset very quickly, saving us the first 50ms wait time.
> +	 *
> +	 * TODO: add ->softreset method and stop abusing ->set_irq
>  	 */
>  	/* set SRST and nIEN */
> -	hwif->OUTBSYNC(hwif, ATA_DEVCTL_OBS | 6, io_ports->ctl_addr);
> +	hwif->set_irq(hwif, 4);
>  	/* more than enough time */
>  	udelay(10);

   It seems to me that the whole idea of having 2 separate methods for 
writing the single device control register is a wrong idea.
I'm suggesting to convert set_irq() method to write_devctrl() method and 
pass the register value directly to it.

MBR, Sergei


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