From mboxrd@z Thu Jan 1 00:00:00 1970 From: Bartlomiej Zolnierkiewicz Subject: Re: [PATCH 62/86] pata_pdc202xx_old: document known issues Date: Wed, 25 Nov 2009 18:52:40 +0100 Message-ID: <200911251852.40281.bzolnier@gmail.com> References: <20091125170218.5446.13513.sendpatchset@localhost> <20091125174632.174666be@lxorguk.ukuu.org.uk> <4B0D6E62.3010609@garzik.org> Mime-Version: 1.0 Content-Type: Text/Plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <4B0D6E62.3010609@garzik.org> Sender: linux-kernel-owner@vger.kernel.org To: Jeff Garzik Cc: Alan Cox , linux-ide@vger.kernel.org, linux-kernel@vger.kernel.org List-Id: linux-ide@vger.kernel.org On Wednesday 25 November 2009 06:50:26 pm Jeff Garzik wrote: > On 11/25/2009 12:46 PM, Alan Cox wrote: > > On Wed, 25 Nov 2009 18:09:48 +0100 > > Bartlomiej Zolnierkiewicz wrote: > > > >> From: Bartlomiej Zolnierkiewicz > >> Subject: [PATCH] pata_pdc202xx_old: document known issues > >> > >> Document known issues with the driver to aid distribution makers, > >> users and developers in making informed decisions instead of wasting > >> their time needlessly. > >> > >> Signed-off-by: Bartlomiej Zolnierkiewicz > >> --- > >> drivers/ata/Kconfig | 4 ++++ > >> 1 file changed, 4 insertions(+) > >> > >> Index: b/drivers/ata/Kconfig > >> =================================================================== > >> --- a/drivers/ata/Kconfig > >> +++ b/drivers/ata/Kconfig > >> @@ -583,6 +583,10 @@ config PATA_PDC_OLD > >> This option enables support for the Promise 20246, 20262, 20263, > >> 20265 and 20267 adapters. > >> > >> + Known issues: > >> + - UDMA transfers fail mysteriously on some chipsets > >> + - ATAPI DMA is unsupported currently > > > > Not sure this is useful, because the reports of UDMA failures are lower > > than most other reports. Should IPV6 have "known issues, mysterious timer > > list corruption" for example which occurs far more. Not do we list 'no > > atapi dma' in the help for the IDE SII driver ? > > If the chip can support ATAPI DMI, but the driver does not, that > deserves a comment, even if it's "hardware bugs prevent ATAPI DMA" or > "ATAPI DMA would require much more code to support, so we did not bother > for now" > > Ditto for things like useful ideas ("consider PIO-over-DMA in SiI 311x") > and other would-be-nice-to-have ideas. These can serve as projects for > newbies, or reminders for old-timers. The problem is that the old driver supported ATAPI DMA so people may have quite different expectations than in case of never-ever-implemented-ideas. -- Bartlomiej Zolnierkiewicz