From 9116300634c5c76cfcd0d2af689846e04d172256 Mon Sep 17 00:00:00 2001 From: Tejun Heo Date: Thu, 21 Feb 2008 13:25:50 +0900 Subject: libata: automatically use DMADIR if drive/bridge requires it Back in 2.6.17-rc2, a libata module parameter was added for atapi_dmadir. That's nice, but most SATA devices which need it will tell us about it in their IDENTIFY PACKET response, as bit-15 of word-62 of the returned data (as per ATA7, ATA8 specifications). So for those which specify it, we should automatically use the DMADIR bit. Otherwise, disc writing will fail by default on many SATA-ATAPI drives. This patch adds ATA_DFLAG_DMADIR and make ata_dev_configure() set it if atapi_dmadir is set or identify data indicates DMADIR is necessary. atapi_xlat() is converted to check ATA_DFLAG_DMADIR before setting DMADIR. Original patch is from Mark Lord. Signed-off-by: Tejun Heo Cc: Mark Lord Signed-off-by: Jeff Garzik --- include/linux/ata.h | 5 +++++ include/linux/libata.h | 1 + 2 files changed, 6 insertions(+) (limited to 'include/linux') diff --git a/include/linux/ata.h b/include/linux/ata.h index 78bbacaed8c..1c622e2b050 100644 --- a/include/linux/ata.h +++ b/include/linux/ata.h @@ -659,6 +659,11 @@ static inline int atapi_command_packet_set(const u16 *dev_id) return (dev_id[0] >> 8) & 0x1f; } +static inline int atapi_id_dmadir(const u16 *dev_id) +{ + return ata_id_major_version(dev_id) >= 7 && (dev_id[62] & 0x8000); +} + static inline int is_multi_taskfile(struct ata_taskfile *tf) { return (tf->command == ATA_CMD_READ_MULTI) || diff --git a/include/linux/libata.h b/include/linux/libata.h index ce7603a7315..a05f6001364 100644 --- a/include/linux/libata.h +++ b/include/linux/libata.h @@ -138,6 +138,7 @@ enum { ATA_DFLAG_AN = (1 << 7), /* AN configured */ ATA_DFLAG_HIPM = (1 << 8), /* device supports HIPM */ ATA_DFLAG_DIPM = (1 << 9), /* device supports DIPM */ + ATA_DFLAG_DMADIR = (1 << 10), /* device requires DMADIR */ ATA_DFLAG_CFG_MASK = (1 << 12) - 1, ATA_DFLAG_PIO = (1 << 12), /* device limited to PIO mode */ -- cgit v1.2.3