linux-kernel - [RFC PATCH] sata_via: Enable hotplug on VT6420

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Message-Id: <201703312115.34955.linux@rainbow-software.org>
Date:   Fri, 31 Mar 2017 21:15:34 +0200
From:   Ondrej Zary <linux@...nbow-software.org>
To:     linux-ide@...r.kernel.org
Cc:     Tejun Heo <tj@...nel.org>,
        Kernel development list <linux-kernel@...r.kernel.org>
Subject: [RFC PATCH] sata_via: Enable hotplug on VT6420

VT6420 seems to have the same hotplug capability as VT6421.

However, enabling hotplug needs to expose SCR registers which can cause
problems. It works for me but might break elsewhere.

---
 drivers/ata/sata_via.c |   10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/ata/sata_via.c b/drivers/ata/sata_via.c
index f3f538e..fafb0d3 100644
--- a/drivers/ata/sata_via.c
+++ b/drivers/ata/sata_via.c
@@ -132,6 +132,8 @@ struct svia_priv {
 
 static struct ata_port_operations vt6420_sata_ops = {
 	.inherits		= &svia_base_ops,
+	.scr_read		= svia_scr_read,
+	.scr_write		= svia_scr_write,
 	.freeze			= svia_noop_freeze,
 	.prereset		= vt6420_prereset,
 	.bmdma_start		= vt6420_bmdma_start,
@@ -556,7 +558,7 @@ static void svia_wd_fix(struct pci_dev *pdev)
 	pci_write_config_byte(pdev, 0x52, tmp8 | BIT(2));
 }
 
-static irqreturn_t vt6421_interrupt(int irq, void *dev_instance)
+static irqreturn_t vt642x_interrupt(int irq, void *dev_instance)
 {
 	struct ata_host *host = dev_instance;
 	irqreturn_t rc = ata_bmdma_interrupt(irq, dev_instance);
@@ -644,7 +646,7 @@ static void svia_configure(struct pci_dev *pdev, int board_id,
 		pci_write_config_byte(pdev, SATA_NATIVE_MODE, tmp8);
 	}
 
-	if (board_id == vt6421) {
+	if (board_id == vt6420 || board_id == vt6421) {
 		/* enable IRQ on hotplug */
 		pci_read_config_byte(pdev, SVIA_MISC_3, &tmp8);
 		if ((tmp8 & SATA_HOTPLUG) != SATA_HOTPLUG) {
@@ -744,8 +746,8 @@ static int svia_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 	svia_configure(pdev, board_id, hpriv);
 
 	pci_set_master(pdev);
-	if (board_id == vt6421)
-		return ata_host_activate(host, pdev->irq, vt6421_interrupt,
+	if (board_id == vt6420 || board_id == vt6421)
+		return ata_host_activate(host, pdev->irq, vt642x_interrupt,
 					 IRQF_SHARED, &svia_sht);
 	else
 		return ata_host_activate(host, pdev->irq, ata_bmdma_interrupt,
-- 
Ondrej Zary