[PATCH 5.4 32/49] ata: ahci: mvebu: Make SATA PHY optional for Armada 3720 - Greg Kroah-Hartman

From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: "Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
	stable@vger.kernel.org, "Pali Rohár" <pali@kernel.org>,
	"Tomasz Maciej Nowak" <tmn505@gmail.com>,
	"Jens Axboe" <axboe@kernel.dk>
Subject: [PATCH 5.4 32/49] ata: ahci: mvebu: Make SATA PHY optional for Armada 3720
Date: Sat, 31 Oct 2020 12:35:28 +0100	[thread overview]
Message-ID: <20201031113456.991170173@linuxfoundation.org> (raw)
In-Reply-To: <20201031113455.439684970@linuxfoundation.org>

From: Pali Rohár <pali@kernel.org>

commit 45aefe3d2251e4e229d7662052739f96ad1d08d9 upstream.

Older ATF does not provide SMC call for SATA phy power on functionality and
therefore initialization of ahci_mvebu is failing when older version of ATF
is using. In this case phy_power_on() function returns -EOPNOTSUPP.

This patch adds a new hflag AHCI_HFLAG_IGN_NOTSUPP_POWER_ON which cause
that ahci_platform_enable_phys() would ignore -EOPNOTSUPP errors from
phy_power_on() call.

It fixes initialization of ahci_mvebu on Espressobin boards where is older
Marvell's Arm Trusted Firmware without SMC call for SATA phy power.

This is regression introduced in commit 8e18c8e58da64 ("arm64: dts: marvell:
armada-3720-espressobin: declare SATA PHY property") where SATA phy was
defined and therefore ahci_platform_enable_phys() on Espressobin started
failing.

Fixes: 8e18c8e58da64 ("arm64: dts: marvell: armada-3720-espressobin: declare SATA PHY property")
Signed-off-by: Pali Rohár <pali@kernel.org>
Tested-by: Tomasz Maciej Nowak <tmn505@gmail.com>
Cc: <stable@vger.kernel.org> # 5.1+: ea17a0f153af: phy: marvell: comphy: Convert internal SMCC firmware return codes to errno
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/ata/ahci.h             |    2 ++
 drivers/ata/ahci_mvebu.c       |    2 +-
 drivers/ata/libahci_platform.c |    2 +-
 3 files changed, 4 insertions(+), 2 deletions(-)

--- a/drivers/ata/ahci.h
+++ b/drivers/ata/ahci.h
@@ -240,6 +240,8 @@ enum {
 							as default lpm_policy */
 	AHCI_HFLAG_SUSPEND_PHYS		= (1 << 26), /* handle PHYs during
 							suspend/resume */
+	AHCI_HFLAG_IGN_NOTSUPP_POWER_ON	= (1 << 27), /* ignore -EOPNOTSUPP
+							from phy_power_on() */
 
 	/* ap->flags bits */
 
--- a/drivers/ata/ahci_mvebu.c
+++ b/drivers/ata/ahci_mvebu.c
@@ -227,7 +227,7 @@ static const struct ahci_mvebu_plat_data
 
 static const struct ahci_mvebu_plat_data ahci_mvebu_armada_3700_plat_data = {
 	.plat_config = ahci_mvebu_armada_3700_config,
-	.flags = AHCI_HFLAG_SUSPEND_PHYS,
+	.flags = AHCI_HFLAG_SUSPEND_PHYS | AHCI_HFLAG_IGN_NOTSUPP_POWER_ON,
 };
 
 static const struct of_device_id ahci_mvebu_of_match[] = {
--- a/drivers/ata/libahci_platform.c
+++ b/drivers/ata/libahci_platform.c
@@ -59,7 +59,7 @@ int ahci_platform_enable_phys(struct ahc
 		}
 
 		rc = phy_power_on(hpriv->phys[i]);
-		if (rc) {
+		if (rc && !(rc == -EOPNOTSUPP && (hpriv->flags & AHCI_HFLAG_IGN_NOTSUPP_POWER_ON))) {
 			phy_exit(hpriv->phys[i]);
 			goto disable_phys;
 		}


