mirror of
https://github.com/archlinuxarm/PKGBUILDs.git
synced 2024-09-19 22:08:32 +00:00
81 lines
2.4 KiB
Diff
81 lines
2.4 KiB
Diff
|
From 10df11bb736c8166e53b41f96688b2e6bd53773b Mon Sep 17 00:00:00 2001
|
||
|
|
From: Richard Zhu <r65037@freescale.com>
|
||
|
|
Date: Fri, 16 Dec 2011 10:08:04 +0800
|
||
|
|
Subject: [PATCH] ENGR00170244-1 ARM: AHCI: Enable PDDQ mode when no disk is attached
|
||
|
|
|
||
|
|
In order to save the power consumption, enable the
|
||
|
|
PDDQ mode of AHCI PHY when there is no sata disk
|
||
|
|
on the port
|
||
|
|
|
||
|
|
Signed-off-by: Richard Zhu <r65037@freescale.com>
|
||
|
|
(cherry picked from commit a53c29d7e484a3562e3a4f24d952485fbeb4c933)
|
||
|
|
---
|
||
|
|
arch/arm/plat-mxc/ahci_sata.c | 30 ++++++++++++++++++++-------
|
||
|
|
arch/arm/plat-mxc/include/mach/ahci_sata.h | 1 +
|
||
|
|
2 files changed, 23 insertions(+), 8 deletions(-)
|
||
|
|
|
||
|
|
diff --git a/arch/arm/plat-mxc/ahci_sata.c b/arch/arm/plat-mxc/ahci_sata.c
|
||
|
|
index 466636b..76a2747 100644
|
||
|
|
--- a/arch/arm/plat-mxc/ahci_sata.c
|
||
|
|
+++ b/arch/arm/plat-mxc/ahci_sata.c
|
||
|
|
@@ -156,7 +156,7 @@ static int sata_init(struct device *dev)
|
||
|
|
{
|
||
|
|
void __iomem *mmio;
|
||
|
|
u32 tmpdata;
|
||
|
|
- int ret = 0;
|
||
|
|
+ int ret = 0, iterations = 20;
|
||
|
|
struct clk *clk;
|
||
|
|
|
||
|
|
sata_clk = clk_get(dev, "imx_sata_clk");
|
||
|
|
@@ -281,14 +281,28 @@ static int sata_init(struct device *dev)
|
||
|
|
|
||
|
|
if (AHCI_SAVE_PWR_WITHOUT_HOTPLUG) {
|
||
|
|
/* Release resources when there is no device on the port */
|
||
|
|
- if ((readl(mmio + PORT_SATA_SR) & 0xF) == 0) {
|
||
|
|
- ret = -ENODEV;
|
||
|
|
- if (machine_is_mx53_smd() || machine_is_mx53_loco()
|
||
|
|
- || board_is_mx53_ard_b())
|
||
|
|
- goto no_device;
|
||
|
|
+ do {
|
||
|
|
+ if ((readl(mmio + PORT_SATA_SR) & 0xF) == 0)
|
||
|
|
+ msleep(25);
|
||
|
|
else
|
||
|
|
- goto release_mem;
|
||
|
|
- }
|
||
|
|
+ break;
|
||
|
|
+
|
||
|
|
+ if (iterations == 0) {
|
||
|
|
+ pr_info("No sata disk.\n");
|
||
|
|
+ ret = -ENODEV;
|
||
|
|
+ /* Enter into PDDQ mode, save power */
|
||
|
|
+ tmpdata = readl(mmio + PORT_PHY_CTL);
|
||
|
|
+ writel(tmpdata | PORT_PHY_CTL_PDDQ_LOC,
|
||
|
|
+ mmio + PORT_PHY_CTL);
|
||
|
|
+
|
||
|
|
+ if (machine_is_mx53_smd()
|
||
|
|
+ || machine_is_mx53_loco()
|
||
|
|
+ || board_is_mx53_ard_b())
|
||
|
|
+ goto no_device;
|
||
|
|
+ else
|
||
|
|
+ goto release_mem;
|
||
|
|
+ }
|
||
|
|
+ } while (iterations-- > 0);
|
||
|
|
}
|
||
|
|
|
||
|
|
iounmap(mmio);
|
||
|
|
diff --git a/arch/arm/plat-mxc/include/mach/ahci_sata.h b/arch/arm/plat-mxc/include/mach/ahci_sata.h
|
||
|
|
index ea68a19..e31797b 100644
|
||
|
|
--- a/arch/arm/plat-mxc/include/mach/ahci_sata.h
|
||
|
|
+++ b/arch/arm/plat-mxc/include/mach/ahci_sata.h
|
||
|
|
@@ -37,6 +37,7 @@ enum {
|
||
|
|
PORT_PHY_CTL_CAP_DAT_LOC = 0x20000,
|
||
|
|
PORT_PHY_CTL_WRITE_LOC = 0x40000,
|
||
|
|
PORT_PHY_CTL_READ_LOC = 0x80000,
|
||
|
|
+ PORT_PHY_CTL_PDDQ_LOC = 0x100000,
|
||
|
|
/* Port0 PHY Status */
|
||
|
|
PORT_PHY_SR = 0x17c,
|
||
|
|
/* PORT_PHY_SR */
|
||
|
|
--
|
||
|
|
1.5.4.4
|
||
|
|
|