On Wed, Apr 28, 2021 at 01:05:37AM +0200, Timo Sigurdsson wrote:
> DIPM is unsupported or broken on sunxi. Trying to enable the power
> management policy med_power_with_dipm on an Allwinner A20 SoC based board
> leads to immediate I/O errors and the attached SATA disk disappears from
> the /dev filesystem. A reset (power cycle) is required to make the SATA
> controller or disk work again. The A10 and A20 SoC data sheets and manuals
> don't mention DIPM at all [1], so it's fair to assume that it's simply not
> supported. But even if it were, it should be considered broken and best be
> disabled in the ahci_sunxi driver.
>
> Fixes: c5754b5220f0 ("ARM: sunxi: Add support for Allwinner SUNXi SoCs sata to ahci_platform")
>
> [1] https://github.com/allwinner-zh/documents/tree/master/
>
> Signed-off-by: Timo Sigurdsson <public_timo.s@xxxxxxxxxxxxxx>
> Tested-by: Timo Sigurdsson <public_timo.s@xxxxxxxxxxxxxx>
> ---
> drivers/ata/ahci_sunxi.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/ata/ahci_sunxi.c b/drivers/ata/ahci_sunxi.c
> index cb69b737cb49..56b695136977 100644
> --- a/drivers/ata/ahci_sunxi.c
> +++ b/drivers/ata/ahci_sunxi.c
> @@ -200,7 +200,7 @@ static void ahci_sunxi_start_engine(struct ata_port *ap)
> }
>
> static const struct ata_port_info ahci_sunxi_port_info = {
> - .flags = AHCI_FLAG_COMMON | ATA_FLAG_NCQ,
> + .flags = AHCI_FLAG_COMMON | ATA_FLAG_NCQ | ATA_FLAG_NO_DIPM,
> .pio_mask = ATA_PIO4,
> .udma_mask = ATA_UDMA6,
> .port_ops = &ahci_platform_ops,
> --
> 2.26.2
>
<formletter>
This is not the correct way to submit patches for inclusion in the
stable kernel tree. Please read:
https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html
for how to do this properly.
</formletter>
