* [PATCH] ata: ahci_sunxi: Disable DIPM
@ 2021-04-27 23:05 Timo Sigurdsson
2021-04-28 5:59 ` Greg KH
2021-04-28 8:40 ` Sergei Shtylyov
0 siblings, 2 replies; 3+ messages in thread
From: Timo Sigurdsson @ 2021-04-27 23:05 UTC (permalink / raw)
To: axboe, mripard, wens, jernej.skrabec, linux-ide,
linux-arm-kernel, linux-sunxi, linux-kernel
Cc: oliver, stable, Timo Sigurdsson
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@silentcreek.de>
Tested-by: Timo Sigurdsson <public_timo.s@silentcreek.de>
---
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
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH] ata: ahci_sunxi: Disable DIPM
2021-04-27 23:05 [PATCH] ata: ahci_sunxi: Disable DIPM Timo Sigurdsson
@ 2021-04-28 5:59 ` Greg KH
2021-04-28 8:40 ` Sergei Shtylyov
1 sibling, 0 replies; 3+ messages in thread
From: Greg KH @ 2021-04-28 5:59 UTC (permalink / raw)
To: Timo Sigurdsson
Cc: axboe, mripard, wens, jernej.skrabec, linux-ide,
linux-arm-kernel, linux-sunxi, linux-kernel, oliver, stable
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@silentcreek.de>
> Tested-by: Timo Sigurdsson <public_timo.s@silentcreek.de>
> ---
> 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>
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] ata: ahci_sunxi: Disable DIPM
2021-04-27 23:05 [PATCH] ata: ahci_sunxi: Disable DIPM Timo Sigurdsson
2021-04-28 5:59 ` Greg KH
@ 2021-04-28 8:40 ` Sergei Shtylyov
1 sibling, 0 replies; 3+ messages in thread
From: Sergei Shtylyov @ 2021-04-28 8:40 UTC (permalink / raw)
To: Timo Sigurdsson, axboe, mripard, wens, jernej.skrabec, linux-ide,
linux-arm-kernel, linux-sunxi, linux-kernel
Cc: oliver, stable
Hello!
On 28.04.2021 2:05, 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
^ was
> disabled in the ahci_sunxi driver.
>
> Fixes: c5754b5220f0 ("ARM: sunxi: Add support for Allwinner SUNXi SoCs sata to ahci_platform")
The "Fixes:" tag should immediately precede the signoff tag...
> [1] https://github.com/allwinner-zh/documents/tree/master/
And this line should be immediately after the patch description.
> Signed-off-by: Timo Sigurdsson <public_timo.s@silentcreek.de>
> Tested-by: Timo Sigurdsson <public_timo.s@silentcreek.de>
[...]
MBR, Sergei
^ permalink raw reply [flat|nested] 3+ messages in thread
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