release/5.2.35/ata-ahci_brcm-BCM7425-AHCI-requires-AHCI_HFLAG_DELAY.patch

From c521af565b47d1db292cb1efba9d57832e1c78ec Mon Sep 17 00:00:00 2001
From: Florian Fainelli <f.fainelli@gmail.com>
Date: Tue, 10 Dec 2019 10:53:46 -0800
Subject: [PATCH] ata: ahci_brcm: BCM7425 AHCI requires AHCI_HFLAG_DELAY_ENGINE

commit 1a3d78cb6e20779a19388315bd8efefbd8d4a656 upstream.

Set AHCI_HFLAG_DELAY_ENGINE for the BCM7425 AHCI controller thus making
it conforming to the 'strict' AHCI implementation which this controller
is based on.

This solves long link establishment with specific hard drives (e.g.:
Seagate ST1000VM002-9ZL1 SC12) that would otherwise have to complete the
error recovery handling before finally establishing a succesful SATA
link at the desired speed.

We re-order the hpriv->flags assignment to also remove the NONCQ quirk
since we can set the flag directly.

Fixes: 9586114cf1e9 ("ata: ahci_brcmstb: add support MIPS-based platforms")
Fixes: 423be77daabe ("ata: ahci_brcmstb: add quirk for broken ncq")
Cc: stable@vger.kernel.org
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

diff --git a/drivers/ata/ahci_brcm.c b/drivers/ata/ahci_brcm.c
index 21043cc70045..66a570d0da83 100644
--- a/drivers/ata/ahci_brcm.c
+++ b/drivers/ata/ahci_brcm.c
@@ -76,8 +76,7 @@ enum brcm_ahci_version {
 };
 
 enum brcm_ahci_quirks {
-	BRCM_AHCI_QUIRK_NO_NCQ		= BIT(0),
-	BRCM_AHCI_QUIRK_SKIP_PHY_ENABLE	= BIT(1),
+	BRCM_AHCI_QUIRK_SKIP_PHY_ENABLE	= BIT(0),
 };
 
 struct brcm_ahci_priv {
@@ -439,18 +438,27 @@ static int brcm_ahci_probe(struct platform_device *pdev)
 	if (!IS_ERR_OR_NULL(priv->rcdev))
 		reset_control_deassert(priv->rcdev);
 
-	if ((priv->version == BRCM_SATA_BCM7425) ||
-		(priv->version == BRCM_SATA_NSP)) {
-		priv->quirks |= BRCM_AHCI_QUIRK_NO_NCQ;
-		priv->quirks |= BRCM_AHCI_QUIRK_SKIP_PHY_ENABLE;
-	}
-
 	hpriv = ahci_platform_get_resources(pdev, 0);
 	if (IS_ERR(hpriv)) {
 		ret = PTR_ERR(hpriv);
 		goto out_reset;
 	}
 
+	hpriv->plat_data = priv;
+	hpriv->flags = AHCI_HFLAG_WAKE_BEFORE_STOP | AHCI_HFLAG_NO_WRITE_TO_RO;
+
+	switch (priv->version) {
+	case BRCM_SATA_BCM7425:
+		hpriv->flags |= AHCI_HFLAG_DELAY_ENGINE;
+		/* fall through */
+	case BRCM_SATA_NSP:
+		hpriv->flags |= AHCI_HFLAG_NO_NCQ;
+		priv->quirks |= BRCM_AHCI_QUIRK_SKIP_PHY_ENABLE;
+		break;
+	default:
+		break;
+	}
+
 	ret = ahci_platform_enable_clks(hpriv);
 	if (ret)
 		goto out_reset;
@@ -470,15 +478,8 @@ static int brcm_ahci_probe(struct platform_device *pdev)
 	/* Must be done before ahci_platform_enable_phys() */
 	brcm_sata_phys_enable(priv);
 
-	hpriv->plat_data = priv;
-	hpriv->flags = AHCI_HFLAG_WAKE_BEFORE_STOP;
-
 	brcm_sata_alpm_init(hpriv);
 
-	if (priv->quirks & BRCM_AHCI_QUIRK_NO_NCQ)
-		hpriv->flags |= AHCI_HFLAG_NO_NCQ;
-	hpriv->flags |= AHCI_HFLAG_NO_WRITE_TO_RO;
-
 	ret = ahci_platform_enable_phys(hpriv);
 	if (ret)
 		goto out_disable_phys;
-- 
2.7.4