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

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Message-ID: <48F65F2A.9020007@ru.mvista.com>
Date:	Thu, 16 Oct 2008 01:22:50 +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.
>>     

   Perhaps with the method itself forcing the obsolete bit 3 set like 
it's done now...

> Makes sense.  Care to make a patch?
>   

   I would if I had the time. Can only make another notch for now...

MBR, Sergei


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