lkml.org 
[lkml]   [2007]   [Jan]   [19]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 8/15] ide: disable DMA in ->ide_dma_check for "no IORDY" case
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
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2007-01-19 18:19    [from the cache]
©2003-2011 Jasper Spaans