This is a note to let you know that I've just added the patch titled
ata: ahci_sunxi: Disable DIPM
to the 5.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ata-ahci_sunxi-disable-dipm.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From f6bca4d91b2ea052e917cca3f9d866b5cc1d500a Mon Sep 17 00:00:00 2001
From: Timo Sigurdsson <public_timo.s@xxxxxxxxxxxxxx>
Date: Mon, 14 Jun 2021 09:25:39 +0200
Subject: ata: ahci_sunxi: Disable DIPM
From: Timo Sigurdsson <public_timo.s@xxxxxxxxxxxxxx>
commit f6bca4d91b2ea052e917cca3f9d866b5cc1d500a upstream.
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 was, it should be considered broken and best be
disabled in the ahci_sunxi driver.
[1] https://github.com/allwinner-zh/documents/tree/master/
Fixes: c5754b5220f0 ("ARM: sunxi: Add support for Allwinner SUNXi SoCs sata to ahci_platform")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Timo Sigurdsson <public_timo.s@xxxxxxxxxxxxxx>
Tested-by: Timo Sigurdsson <public_timo.s@xxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20210614072539.3307-1-public_timo.s@xxxxxxxxxxxxxx
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/ata/ahci_sunxi.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/ata/ahci_sunxi.c
+++ b/drivers/ata/ahci_sunxi.c
@@ -200,7 +200,7 @@ static void ahci_sunxi_start_engine(stru
}
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,
Patches currently in stable-queue which might be from public_timo.s@xxxxxxxxxxxxxx are
queue-5.4/ata-ahci_sunxi-disable-dipm.patch
