linux-kernel - [PATCH] pata_cs5520: resume support

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Date:	Wed, 22 Nov 2006 17:01:06 +0000
From:	Alan <alan@...rguk.ukuu.org.uk>
To:	jgarzik@...ox.com, linux-kernel@...r.kernel.org, akpm@...l.org
Subject: [PATCH] pata_cs5520: resume support

The CS5520 doesn't need much help to resume but we do need to restore
pcicfg which may have been reset to the BIOS default which is
sometimes incorrect.

Signed-off-by: Alan Cox <alan@...hat.com>

diff -u --new-file --recursive --exclude-from /usr/src/exclude linux.vanilla-2.6.19-rc5-mm2/drivers/ata/pata_cs5520.c linux-2.6.19-rc5-mm2/drivers/ata/pata_cs5520.c
--- linux.vanilla-2.6.19-rc5-mm2/drivers/ata/pata_cs5520.c	2006-11-15 13:25:59.000000000 +0000
+++ linux-2.6.19-rc5-mm2/drivers/ata/pata_cs5520.c	2006-11-22 15:01:20.215376872 +0000
@@ -41,7 +41,7 @@
 #include <linux/libata.h>
 
 #define DRV_NAME	"pata_cs5520"
-#define DRV_VERSION	"0.6.2"
+#define DRV_VERSION	"0.6.3"
 
 struct pio_clocks
 {
@@ -167,6 +167,8 @@
 	.dma_boundary		= ATA_DMA_BOUNDARY,
 	.slave_configure	= ata_scsi_slave_config,
 	.bios_param		= ata_std_bios_param,
+	.resume			= ata_scsi_device_resume,
+	.suspend		= ata_scsi_device_suspend,
 };
 
 static struct ata_port_operations cs5520_port_ops = {
@@ -296,6 +298,22 @@
 	dev_set_drvdata(dev, NULL);
 }
 
+/**
+ *	cs5520_reinit_one	-	device resume
+ *	@pdev: PCI device
+ *
+ *	Do any reconfiguration work needed by a resume from RAM. We need
+ *	to restore DMA mode support on BIOSen which disabled it
+ */
+ 
+static int cs5520_reinit_one(struct pci_dev *pdev)
+{
+	u8 pcicfg;
+	pci_read_config_byte(pdev, 0x60, &pcicfg);
+	if ((pcicfg & 0x40) == 0)
+		pci_write_config_byte(pdev, 0x60, pcicfg | 0x40);
+	return ata_pci_device_resume(pdev);
+}
 /* For now keep DMA off. We can set it for all but A rev CS5510 once the
    core ATA code can handle it */
 
@@ -310,7 +328,9 @@
 	.name 		= DRV_NAME,
 	.id_table	= pata_cs5520,
 	.probe 		= cs5520_init_one,
-	.remove		= cs5520_remove_one
+	.remove		= cs5520_remove_one,
+	.suspend	= ata_pci_device_suspend,
+	.resume		= cs5520_reinit_one,
 };
 
 static int __init cs5520_init(void)

-
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