From mboxrd@z Thu Jan  1 00:00:00 1970
From: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Subject: Re: [PATCH 10/13] sl82c105: add ->speedproc support
Date: Sun, 11 Mar 2007 00:51:28 +0300
Message-ID: <45F32860.8040901@ru.mvista.com>
References: <200703102209.59918.bzolnier@gmail.com>
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To: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Cc: linux-ide@vger.kernel.org

Hello.

Bartlomiej Zolnierkiewicz wrote:
> [PATCH] sl82c105: add ->speedproc support

> * add sl82c105_tunepio() wrapper for sl82c105_tune_drive()
>   (just to get the error value)

> * add sl82c105_tune_chipset() (->speedproc method) for setting
>   transfer mode

    Thanks for the patch!

> Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
> ---

  > Index: b/drivers/ide/pci/sl82c105.c
> ===================================================================
> --- a/drivers/ide/pci/sl82c105.c
> +++ b/drivers/ide/pci/sl82c105.c
> @@ -77,7 +77,7 @@ static unsigned int get_timing_sl82c105(
>  /*
>   * Configure the drive and chipset for PIO
>   */
> -static void sl82c105_tune_drive(ide_drive_t *drive, u8 pio)
> +static int sl82c105_tunepio(ide_drive_t *drive, u8 pio)

    The name sl82c105_tune_pio() would have been more in line with the other 
drivers but well, that's your patch (and the function behaves somewhat 
differently anyway :-)

>  {
>  	ide_hwif_t *hwif	= HWIF(drive);
>  	struct pci_dev *dev	= hwif->pci_dev;
> @@ -91,7 +91,7 @@ static void sl82c105_tune_drive(ide_driv
>  	xfer_mode = ide_get_best_pio_mode(drive, pio, 5, &p) + XFER_PIO_0;
>  
>  	if (ide_config_drive_speed(drive, xfer_mode))
> -		return;
> +		return 1;
>  
>  	drive->drive_data = drv_ctrl = get_timing_sl82c105(&p);
>  
> @@ -114,17 +114,45 @@ static void sl82c105_tune_drive(ide_driv
>  	 */
>  	drive->io_32bit = 1;
>  	drive->unmask	= 1;
> +
> +	return 0;
> +}
> +
> +static void sl82c105_tune_drive(ide_drive_t *drive, u8 pio)
> +{
> +	/*
> +	 * TODO: find best PIO mode and set device speed here
> +	 *       (requires adding helper function for getting PIO cycle time)
> +	 */

   I thought we were doing it by calling ide_get_best_pio_mode() above...

> +	(void)sl82c105_tunepio(drive, pio);

    Erm, I thought afterwards that I vainly folded one into another. I think 
it's worth moving those io_32bit and unmask flag assignments above back 
there... May also recast my patch. :-)

> +}
> +
> +static int sl82c105_tune_chipset(ide_drive_t *drive, u8 mode)
> +{
> +	mode = ide_rate_filter(drive, mode);
> +
> +	if (mode >= XFER_PIO_0 && mode <= XFER_PIO_5)
> +		return sl82c105_tunepio(drive, mode - XFER_PIO_0);
> +
> +	/*
> +	 * TODO: add MWDMA0/1 support
> +	 */
> +	BUG_ON(mode != XFER_MW_DMA_2);

    Well, the other drivers just return non-zero in this case...

> +	/*
> +	 * Configure the drive for DMA.
> +	 * We'll program the chipset only when DMA is actually turned on.
> +	 */
> +	return ide_config_drive_speed(drive, mode);
>  }
>  
> -/*
> - * Configure the drive for DMA.
> - * We'll program the chipset only when DMA is actually turned on.
> - */
>  static int config_for_dma (ide_drive_t *drive)
>  {
> +	u8 mode = ide_max_dma_mode(drive);
> +
>  	DBG(("config_for_dma(drive:%s)\n", drive->name));
>  
> -	if (ide_config_drive_speed(drive, XFER_MW_DMA_2) != 0)
> +	if (mode == 0 || sl82c105_tune_chipset(drive, mode))
>  		return 0;
>  
>  	return ide_dma_enable(drive);
> @@ -387,6 +415,8 @@ static void __devinit init_hwif_sl82c105
>  		return;
>  	}
>  
> +	hwif->speedproc			= &sl82c105_tune_chipset;
> +
>  	hwif->atapi_dma  = 1;
>  	hwif->mwdma_mask = 0x04;

MBR, Sergei