linux-kernel - [PATCH AUTOSEL 6.6 14/21] ahci: asm1166: correct count of reported ports

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Date: Fri,  2 Feb 2024 13:40:01 -0500
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Conrad Kostecki <conikost@...too.org>,
	Hans de Goede <hdegoede@...hat.com>,
	Niklas Cassel <cassel@...nel.org>,
	Sasha Levin <sashal@...nel.org>,
	dlemoal@...nel.org,
	linux-ide@...r.kernel.org
Subject: [PATCH AUTOSEL 6.6 14/21] ahci: asm1166: correct count of reported ports

From: Conrad Kostecki <conikost@...too.org>

[ Upstream commit 0077a504e1a4468669fd2e011108db49133db56e ]

The ASM1166 SATA host controller always reports wrongly,
that it has 32 ports. But in reality, it only has six ports.

This seems to be a hardware issue, as all tested ASM1166
SATA host controllers reports such high count of ports.

Example output: ahci 0000:09:00.0: AHCI 0001.0301
32 slots 32 ports 6 Gbps 0xffffff3f impl SATA mode.

By adjusting the port_map, the count is limited to six ports.

New output: ahci 0000:09:00.0: AHCI 0001.0301
32 slots 32 ports 6 Gbps 0x3f impl SATA mode.

Closes: https://bugzilla.kernel.org/show_bug.cgi?id=211873
Closes: https://bugzilla.kernel.org/show_bug.cgi?id=218346
Signed-off-by: Conrad Kostecki <conikost@...too.org>
Reviewed-by: Hans de Goede <hdegoede@...hat.com>
Signed-off-by: Niklas Cassel <cassel@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/ata/ahci.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
index 08745e7db820..2b8f0c3c3879 100644
--- a/drivers/ata/ahci.c
+++ b/drivers/ata/ahci.c
@@ -657,6 +657,11 @@ MODULE_PARM_DESC(mobile_lpm_policy, "Default LPM policy for mobile chipsets");
 static void ahci_pci_save_initial_config(struct pci_dev *pdev,
 					 struct ahci_host_priv *hpriv)
 {
+	if (pdev->vendor == PCI_VENDOR_ID_ASMEDIA && pdev->device == 0x1166) {
+		dev_info(&pdev->dev, "ASM1166 has only six ports\n");
+		hpriv->saved_port_map = 0x3f;
+	}
+
 	if (pdev->vendor == PCI_VENDOR_ID_JMICRON && pdev->device == 0x2361) {
 		dev_info(&pdev->dev, "JMB361 has only one port\n");
 		hpriv->saved_port_map = 1;
-- 
2.43.0