On Wednesday 13 May 2009 15:49:04 Alan Cox wrote: > > [ Sigh, this issue seems to go back to: > > > > commit 669a5db411d85a14f86cd92bc16bf7ab5b8aa235 > > Author: Jeff Garzik <jeff@xxxxxxxxxx> > > Date: Tue Aug 29 18:12:40 2006 -0400 > > > > [libata] Add a bunch of PATA drivers. ] > > No its quite recent actually - broke around 2.6.27 > > The libata drivers try and reset the simplex bits to check if a device is > merely in simplex mode by configuration. Unfortunately on the ALi if you > put the device into a power saving mode and bring it back the simplex > bits get corrupted and the register becomes unwritable (even to restore) > > Somewhere around 2.6.27 something started rudely dumping the device into > power saving mode outside of the ATA layer on certain PCs. > > So we switch to ignoring the bit in the first place on this chip. Ok, thanks for explaining it. BTW you may consider removing ata_pci_bmdma_clear_simplex() call from ali_init_chipset() now (before somebody decides to fix the code to check the former's function return value). -- 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
