On 9/27/22 03:38, Niklas Cassel wrote:
> From: Niklas Cassel <niklas.cassel@xxxxxxx>
>
> Commit 1527f69204fe ("ata: ahci: Add Green Sardine vendor ID as
> board_ahci_mobile") added an explicit entry for AMD Green Sardine
> AHCI controller using the board_ahci_mobile configuration (this
> configuration has later been renamed to board_ahci_low_power).
>
> The board_ahci_low_power configuration enables support for low power
> modes.
>
> This explicit entry takes precedence over the generic AHCI controller
> entry, which does not enable support for low power modes.
>
> Therefore, when commit 1527f69204fe ("ata: ahci: Add Green Sardine
> vendor ID as board_ahci_mobile") was backported to stable kernels,
> it make some Pioneer optical drives, which was working perfectly fine
> before the commit was backported, stop working.
>
> The real problem is that the Pioneer optical drives do not handle low
> power modes correctly. If these optical drives would have been tested
> on another AHCI controller using the board_ahci_low_power configuration,
> this issue would have been detected earlier.
>
> Unfortunately, the board_ahci_low_power configuration is only used in
> less than 15% of the total AHCI controller entries, so many devices
> have never been tested with an AHCI controller with low power modes.
>
> Fixes: 1527f69204fe ("ata: ahci: Add Green Sardine vendor ID as board_ahci_mobile")
> Cc: stable@xxxxxxxxxxxxxxx
> Reported-by: Jaap Berkhout <j.j.berkhout@xxxxxxxxxxxxxx>
> Signed-off-by: Niklas Cassel <niklas.cassel@xxxxxxx>
Applied to for-6.0-fixes. Thanks !
> ---
> drivers/ata/libata-core.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
> index 826d41f341e4..c9a9aa607b62 100644
> --- a/drivers/ata/libata-core.c
> +++ b/drivers/ata/libata-core.c
> @@ -3988,6 +3988,10 @@ static const struct ata_blacklist_entry ata_device_blacklist [] = {
> { "PIONEER DVD-RW DVR-212D", NULL, ATA_HORKAGE_NOSETXFER },
> { "PIONEER DVD-RW DVR-216D", NULL, ATA_HORKAGE_NOSETXFER },
>
> + /* These specific Pioneer models have LPM issues */
> + { "PIONEER BD-RW BDR-207M", NULL, ATA_HORKAGE_NOLPM },
> + { "PIONEER BD-RW BDR-205", NULL, ATA_HORKAGE_NOLPM },
> +
> /* Crucial BX100 SSD 500GB has broken LPM support */
> { "CT500BX100SSD1", NULL, ATA_HORKAGE_NOLPM },
>
--
Damien Le Moal
Western Digital Research
