Hi Sergei, On Monday 12 April 2010 03:53:28 pm Sergei Shtylyov wrote: > Bartlomiej Zolnierkiewicz wrote: > > From: Bartlomiej Zolnierkiewicz <bzolnier@xxxxxxxxx> > > Subject: [PATCH] alim15x3: fix handling of UDMA enable bit > > > > Clear UDMA enable bit also for PIO modes. > > > > Sorry for late mail but I fail to understand why this was done and > what this patch fixes. > > > Based on libata pata_ali host driver. > > libata has different mode programming code where first always the PIO > mode and then DMA mode is set. With IDE core, the order can be > different, PIO mode programming shouldn't affect DMA mode bits -- and > does not affect it in the other drivers... This was just a tiny part of larger patchset preparing alim15x3 for conversion to ide2libata framework and it seems the problem is only affecting user-initiated transfer mode changes (which are strongly discouraged anyway) as both libata and IDE core use quite similar transfer mode programming sequence by default. However thanks for noticing the issue, I will fix it for both drivers during the next update of atang tree (unless somebody sends me a patch sooner). -- Bartlomiej Zolnierkiewicz -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
