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libata: Add atapi_dmadir force flag

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Some device require DMADIR to be enabled, but are not detected as such
by atapi_id_dmadir.  One such example is "Asus Serillel 2"
SATA-host-to-PATA-device bridge: the bridge itself requires DMADIR,
even if the bridged device does not.

As atapi_dmadir module parameter can cause problems with some devices
(as per Tejun Heo's memory), enabling it globally may not be possible
depending on the hardware.

This patch adds atapi_dmadir in the form of a "force" horkage value,
allowing global, per-bus and per-device control.

Signed-off-by: Vincent Pelletier <[email protected]>
Signed-off-by: Tejun Heo <[email protected]>
This commit is contained in:
Vincent Pelletier 2013-05-21 22:30:58 +02:00 • committed by Tejun Heo
commit 966fbe193f
3 changed files with 5 additions and 1 deletions
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3
drivers/ata/libata-core.c
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@ -2395,7 +2395,7 @@ int ata_dev_configure(struct ata_device *dev)
cdb_intr_string = ", CDB intr";
}
if (atapi_dmadir || atapi_id_dmadir(dev->id)) {
if (atapi_dmadir || (dev->horkage & ATA_HORKAGE_ATAPI_DMADIR) || atapi_id_dmadir(dev->id)) {
dev->flags |= ATA_DFLAG_DMADIR;
dma_dir_string = ", DMADIR";
}
@ -6496,6 +6496,7 @@ static int __init ata_parse_force_one(char **cur,
{ "nosrst", .lflags = ATA_LFLAG_NO_SRST },
{ "norst", .lflags = ATA_LFLAG_NO_HRST | ATA_LFLAG_NO_SRST },
{ "rstonce", .lflags = ATA_LFLAG_RST_ONCE },
{ "atapi_dmadir", .horkage_on = ATA_HORKAGE_ATAPI_DMADIR },
};
char *start = *cur, *p = *cur;
char *id, *val, *endp;