From b93fda12357b3f1aa55cf69d8e088372788ea9ea Mon Sep 17 00:00:00 2001 From: Alan Cox Date: Tue, 8 Apr 2008 16:36:44 +0100 Subject: [PATCH] libata: Be a bit more slack about early devices We have a certain number of 'ATA' emulations often on CF or other flash devices that are at best "loosely based" on the CF 1.1 standard. These devices report themselves as disk but don't support the ATA minimal command set only the CF 1.1 set. Relax the PIO checking for devices reporting ATA rev 0, or no iordy support, or CFA. Rework the code a bit as it was already messy and this made it quite ugly. Signed-off-by: Alan Cox Signed-off-by: Jeff Garzik --- drivers/ata/libata-core.c | 25 +++++++++++++++---------- 1 file changed, 15 insertions(+), 10 deletions(-) diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c index 2556ea29defb..733eb94d055e 100644 --- a/drivers/ata/libata-core.c +++ b/drivers/ata/libata-core.c @@ -3132,16 +3132,21 @@ static int ata_dev_set_mode(struct ata_device *dev) if (rc) return rc; - /* Old CFA may refuse this command, which is just fine */ - if (dev->xfer_shift == ATA_SHIFT_PIO && ata_id_is_cfa(dev->id)) - ign_dev_err = 1; - - /* Some very old devices and some bad newer ones fail any kind of - SET_XFERMODE request but support PIO0-2 timings and no IORDY */ - if (dev->xfer_shift == ATA_SHIFT_PIO && !ata_id_has_iordy(dev->id) && - dev->pio_mode <= XFER_PIO_2) - ign_dev_err = 1; - + if (dev->xfer_shift == ATA_SHIFT_PIO) { + /* Old CFA may refuse this command, which is just fine */ + if (ata_id_is_cfa(dev->id)) + ign_dev_err = 1; + /* Catch several broken garbage emulations plus some pre + ATA devices */ + if (ata_id_major_version(dev->id) == 0 && + dev->pio_mode <= XFER_PIO_2) + ign_dev_err = 1; + /* Some very old devices and some bad newer ones fail + any kind of SET_XFERMODE request but support PIO0-2 + timings and no IORDY */ + if (!ata_id_has_iordy(dev->id) && dev->pio_mode <= XFER_PIO_2) + ign_dev_err = 1; + } /* Early MWDMA devices do DMA but don't allow DMA mode setting. Don't fail an MWDMA0 set IFF the device indicates it is in MWDMA0 */ if (dev->xfer_shift == ATA_SHIFT_MWDMA &&