mirror of
https://github.com/archlinuxarm/PKGBUILDs.git
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54 lines
1.7 KiB
Diff
54 lines
1.7 KiB
Diff
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From 3cb5c41657a793fd442766d076eddde06af9c9ce 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 10:08:42 +0800
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Subject: [PATCH] ENGR00170244-2 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 f97994abf50e9917a959ae62eabd08908a75a222)
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---
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drivers/hwmon/imx_ahci_hwmon.c | 10 ++++++++++
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1 files changed, 10 insertions(+), 0 deletions(-)
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diff --git a/drivers/hwmon/imx_ahci_hwmon.c b/drivers/hwmon/imx_ahci_hwmon.c
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index 62048f7..7688d92 100644
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--- a/drivers/hwmon/imx_ahci_hwmon.c
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+++ b/drivers/hwmon/imx_ahci_hwmon.c
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@@ -90,6 +90,11 @@ static ssize_t imx_ahci_hwmon_temp_show(struct device *dev,
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return -1;
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}
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+ /* Disable PDDQ mode when this mode is enabled */
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+ read_sum = readl(mmio + PORT_PHY_CTL);
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+ if (read_sum & PORT_PHY_CTL_PDDQ_LOC)
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+ writel(read_sum & ~PORT_PHY_CTL_PDDQ_LOC, mmio + PORT_PHY_CTL);
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+
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/* check rd-wr to reg */
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read_sum = 0;
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sata_phy_cr_addr(SATA_PHY_CR_CLOCK_CRCMP_LT_LIMIT, mmio);
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@@ -230,6 +235,10 @@ static ssize_t imx_ahci_hwmon_temp_show(struct device *dev,
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a = (m2 - m1) / (m2 / 1000);
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temp = ((((-559) * a) / 1000) * a) / 1000 + (1379) * a / 1000 + (-458);
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+ /* Enable PDDQ mode to save power */
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+ read_sum = readl(mmio + PORT_PHY_CTL);
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+ writel(read_sum | PORT_PHY_CTL_PDDQ_LOC, mmio + PORT_PHY_CTL);
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+
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iounmap(mmio);
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/* Release the clocks */
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@@ -237,6 +246,7 @@ static ssize_t imx_ahci_hwmon_temp_show(struct device *dev,
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clk_put(sata_ref_clk);
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clk_disable(sata_clk);
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clk_put(sata_clk);
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+
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mutex_unlock(&hwmon->lock);
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return sprintf(buf, "%d\n", temp * 1000);
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--
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1.5.4.4
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