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