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From: Sergei Shtylyov <sshtylyov@ru.mvista.com>
To: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Cc: linux-ide@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 8/15] ide: disable DMA in ->ide_dma_check for "no IORDY" case
Date: Fri, 19 Jan 2007 19:26:19 +0300	[thread overview]
Message-ID: <45B0F12B.3000202@ru.mvista.com> (raw)
In-Reply-To: <20070119003154.14846.87217.sendpatchset@localhost.localdomain>

Hello.

Bartlomiej Zolnierkiewicz wrote:
> [PATCH] ide: disable DMA in ->ide_dma_check for "no IORDY" case

    I've looked thru the code, and found more issues with the PIO fallback 
there. Will try to cook up patches for at least some drivers...

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

> Index: b/drivers/ide/pci/aec62xx.c
> ===================================================================
> --- a/drivers/ide/pci/aec62xx.c
> +++ b/drivers/ide/pci/aec62xx.c
> @@ -214,12 +214,10 @@ static int aec62xx_config_drive_xfer_rat
>  	if (ide_use_dma(drive) && config_chipset_for_dma(drive))
>  		return hwif->ide_dma_on(drive);
>  
> -	if (ide_use_fast_pio(drive)) {
> +	if (ide_use_fast_pio(drive))
>  		aec62xx_tune_drive(drive, 5);

    This function looks like it's working (thouugh having the wrong limit of 
PIO5 on auto-tuning) but is unnecassary complex.
    Heh, the driver is certainly a rip-off form hpt366.c. What a doubtful 
example they have chosen... :-)

> Index: b/drivers/ide/pci/atiixp.c
> ===================================================================
> --- a/drivers/ide/pci/atiixp.c
> +++ b/drivers/ide/pci/atiixp.c
> @@ -264,10 +264,9 @@ static int atiixp_dma_check(ide_drive_t 
>  		tspeed = ide_get_best_pio_mode(drive, 255, 5, NULL);
>  		speed = atiixp_dma_2_pio(XFER_PIO_0 + tspeed) + XFER_PIO_0;

    It's simply stupid to convert PIO mode to PIO mode. The whole idea is 
doubtful as well..

>  		hwif->speedproc(drive, speed);

    Well, well, the tuneproc() method can't ahndle auto-tunuing here (255)...
And it also doesn't set up drive's own speed. The code seem to be another 
rip-off from piix.c, repeating all its mistakes... :-)

> Index: b/drivers/ide/pci/cmd64x.c
> ===================================================================
> --- a/drivers/ide/pci/cmd64x.c
> +++ b/drivers/ide/pci/cmd64x.c
> @@ -479,12 +479,10 @@ static int cmd64x_config_drive_for_dma (
>  	if (ide_use_dma(drive) && config_chipset_for_dma(drive))
>  		return hwif->ide_dma_on(drive);
>  
> -	if (ide_use_fast_pio(drive)) {
> +	if (ide_use_fast_pio(drive))
>  		config_chipset_for_pio(drive, 1);

    This function will always set PIO mode 4. Mess.

> Index: b/drivers/ide/pci/cs5535.c
> ===================================================================
> --- a/drivers/ide/pci/cs5535.c
> +++ b/drivers/ide/pci/cs5535.c
> @@ -206,10 +206,9 @@ static int cs5535_dma_check(ide_drive_t 
>  	if (ide_use_fast_pio(drive)) {
>  		speed = ide_get_best_pio_mode(drive, 255, 4, NULL);
>  		cs5535_set_drive(drive, speed);

    Could be folded into tuneproc() method call.

> Index: b/drivers/ide/pci/pdc202xx_old.c
> ===================================================================
> --- a/drivers/ide/pci/pdc202xx_old.c
> +++ b/drivers/ide/pci/pdc202xx_old.c
> @@ -339,12 +339,10 @@ static int pdc202xx_config_drive_xfer_ra
>  	if (ide_use_dma(drive) && config_chipset_for_dma(drive))
>  		return hwif->ide_dma_on(drive);
>  
> -	if (ide_use_fast_pio(drive)) {
> +	if (ide_use_fast_pio(drive))
>  		hwif->tuneproc(drive, 5);

    This driver's tuneproc() method always auto-tunes here instead of setting 
what it's told too -- I'll send a patch...

> Index: b/drivers/ide/pci/siimage.c
> ===================================================================
> --- a/drivers/ide/pci/siimage.c
> +++ b/drivers/ide/pci/siimage.c
> @@ -420,12 +420,10 @@ static int siimage_config_drive_for_dma 
>  	if (ide_use_dma(drive) && config_chipset_for_dma(drive))
>  		return hwif->ide_dma_on(drive);
>  
> -	if (ide_use_fast_pio(drive)) {
> +	if (ide_use_fast_pio(drive))
>  		config_chipset_for_pio(drive, 1);

    This function will also always set PIO mode 4. More mess.

> Index: b/drivers/ide/pci/sis5513.c
> ===================================================================
> --- a/drivers/ide/pci/sis5513.c
> +++ b/drivers/ide/pci/sis5513.c
> @@ -678,12 +678,10 @@ static int sis5513_config_xfer_rate(ide_
>  	if (ide_use_dma(drive) && config_chipset_for_dma(drive))
>  		return hwif->ide_dma_on(drive);
>  
> -	if (ide_use_fast_pio(drive)) {
> +	if (ide_use_fast_pio(drive))
>  		sis5513_tune_drive(drive, 5);

     Ugh, PIO fallback effectively always tries to set mode 4 here (thanks 
it's not 5). Mess.

MBR, Sergei

  reply	other threads:[~2007-01-19 16:26 UTC|newest]

Thread overview: 46+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-01-19  0:30 [PATCH 0/15] IDE quilt tree updated Bartlomiej Zolnierkiewicz
2007-01-19  0:31 ` [PATCH 1/15] ACPI support for IDE devices Bartlomiej Zolnierkiewicz
2007-01-19  0:31 ` [PATCH 2/15] via82cxxx/pata_via: correct PCI_DEVICE_ID_VIA_SATA_EIDE ID and add support for CX700 and 8237S Bartlomiej Zolnierkiewicz
2007-01-19  0:31 ` [PATCH 3/15] it8213: fix build and ->ultra_mask Bartlomiej Zolnierkiewicz
2007-01-19  0:31 ` [PATCH 4/15] ide: convert ide_hwif_t.mmio into flag Bartlomiej Zolnierkiewicz
2007-01-19  0:31 ` [PATCH 5/15] hpt34x: hpt34x_tune_chipset() (->speedproc) fix Bartlomiej Zolnierkiewicz
2007-01-19  0:31 ` [PATCH 6/15] atiixp/jmicron/triflex: fix PIO fallback Bartlomiej Zolnierkiewicz
2007-01-19  0:31 ` [PATCH 7/15] piix: cleanup Bartlomiej Zolnierkiewicz
2007-01-19  0:31 ` [PATCH 8/15] ide: disable DMA in ->ide_dma_check for "no IORDY" case Bartlomiej Zolnierkiewicz
2007-01-19 16:26   ` Sergei Shtylyov [this message]
     [not found]     ` <58cb370e0701191047h524434eobdb9d86ed614bc71@mail.gmail.com>
2007-01-19 19:11       ` Bartlomiej Zolnierkiewicz
2007-01-19 19:35         ` Sergei Shtylyov
     [not found]           ` <58cb370e0701191200i10119313i4aacae9c504a02e4@mail.gmail.com>
2007-01-19 21:43             ` Bartlomiej Zolnierkiewicz
2007-01-20 17:09               ` Sergei Shtylyov
     [not found]                 ` <58cb370e0701200947p578f4d74g1fee511ded6c9a77@mail.gmail.com>
2007-01-20 18:21                   ` Bartlomiej Zolnierkiewicz
2007-01-20 18:41                     ` Sergei Shtylyov
2007-01-25 17:03                     ` Sergei Shtylyov
2007-01-19  0:32 ` [PATCH 9/15] sgiioc4: fix sgiioc4_ide_dma_check() to enable/disable DMA properly Bartlomiej Zolnierkiewicz
2007-01-19  0:32 ` [PATCH 10/15] ide: add ide_set_dma() helper Bartlomiej Zolnierkiewicz
2007-01-20 20:22   ` Sergei Shtylyov
2007-01-19  0:32 ` [PATCH 11/15] ide: make ide_hwif_t.ide_dma_{host_off,off_quietly} void Bartlomiej Zolnierkiewicz
2007-01-20 20:56   ` Sergei Shtylyov
     [not found]     ` <58cb370e0702021206h205ff983r88fb4bdbea42ed9f@mail.gmail.com>
2007-02-02 22:39       ` Bartlomiej Zolnierkiewicz
2007-01-19  0:32 ` [PATCH 12/15] ide: make ide_hwif_t.ide_dma_host_on void Bartlomiej Zolnierkiewicz
2007-01-20 20:46   ` Sergei Shtylyov
     [not found]     ` <58cb370e0702021128g15cac87ar507c20e78ded9464@mail.gmail.com>
2007-02-02 21:16       ` Bartlomiej Zolnierkiewicz
2007-03-26 17:19   ` Sergei Shtylyov
2007-04-20 20:36     ` Sergei Shtylyov
2007-01-19  0:32 ` [PATCH 13/15] ide: fix UDMA/MWDMA/SWDMA masks Bartlomiej Zolnierkiewicz
2007-01-22 16:19   ` Sergei Shtylyov
     [not found]     ` <58cb370e0702021606v4efa6143lf060e6aab9782c35@mail.gmail.com>
2007-02-03  0:39       ` Bartlomiej Zolnierkiewicz
2007-02-03 16:30         ` Sergei Shtylyov
2007-01-22 18:17   ` Sergei Shtylyov
2007-01-22 18:46     ` Alan
2007-01-22 20:28       ` Sergei Shtylyov
2007-01-22 21:31         ` Alan
2007-01-22 22:39           ` Jeff Garzik
2007-01-23 14:51           ` Sergei Shtylyov
2007-01-25 15:40             ` Sergei Shtylyov
2007-01-31 20:38       ` Sergei Shtylyov
2007-01-31 23:24         ` Alan
     [not found]     ` <58cb370e0702021606m4eb6f682xfa4bf769d398cf9@mail.gmail.com>
2007-02-03  0:50       ` Bartlomiej Zolnierkiewicz
2007-01-19  0:32 ` [PATCH 14/15] ide: rework the code for selecting the best DMA transfer mode Bartlomiej Zolnierkiewicz
2007-01-22 19:48   ` Sergei Shtylyov
     [not found]     ` <58cb370e0702021207o435f39cdsf3abb0d55829fc45@mail.gmail.com>
2007-02-02 23:57       ` Bartlomiej Zolnierkiewicz
2007-01-19  0:32 ` [PATCH 15/15] ide: add ide_tune_dma() helper Bartlomiej Zolnierkiewicz

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