ata: libata-core: Add ATA_HORKAGE_NOLPM for Apacer AS340

Commit 7627a0edef54 ("ata: ahci: Drop low power policy board type")
dropped the board_ahci_low_power board type, and instead enables LPM if:
-The AHCI controller reports that it supports LPM (Partial/Slumber), and
-CONFIG_SATA_MOBILE_LPM_POLICY != 0, and
-The port is not defined as external in the per port PxCMD register, and
-The port is not defined as hotplug capable in the per port PxCMD
 register.

Partial and Slumber LPM states can either be initiated by HIPM or DIPM.

For HIPM (host initiated power management) to get enabled, both the AHCI
controller and the drive have to report that they support HIPM.

For DIPM (device initiated power management) to get enabled, only the
drive has to report that it supports DIPM. However, the HBA will reject
device requests to enter LPM states which the HBA does not support.

The problem is that Apacer AS340 drives do not handle low power modes
correctly. The problem was most likely not seen before because no one
had used this drive with a AHCI controller with LPM enabled.

Add a quirk so that we do not enable LPM for this drive, since we see
command timeouts if we do (even though the drive claims to support DIPM).

Fixes: 7627a0edef54 ("ata: ahci: Drop low power policy board type")
Cc: stable@vger.kernel.org
Reported-by: Tim Teichmann <teichmanntim@outlook.de>
Closes: https://lore.kernel.org/linux-ide/87bk4pbve8.ffs@tglx/
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Signed-off-by: Niklas Cassel <cassel@kernel.org>

diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 4ea859dc381aa5442fef1fb24f7587b7ba979306..e1bf8a19b3c89e2cdfc257578bdc9b92cc95cb80 100644 (file)
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -4159,6 +4159,9 @@ static const struct ata_blacklist_entry ata_device_blacklist [] = {
        /* AMD Radeon devices with broken LPM support */
        { "R3SL240G",                   NULL,   ATA_HORKAGE_NOLPM },
 
+       /* Apacer models with LPM issues */
+       { "Apacer AS340*",              NULL,   ATA_HORKAGE_NOLPM },
+
        /* These specific Samsung models/firmware-revs do not handle LPM well */
        { "SAMSUNG MZMPC128HBFU-000MV", "CXM14M1Q", ATA_HORKAGE_NOLPM },
        { "SAMSUNG SSD PM830 mSATA *",  "CXM13D1Q", ATA_HORKAGE_NOLPM },