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86 lines
2.5 KiB
Diff
86 lines
2.5 KiB
Diff
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From 48379fed3987d587a25a48e155872e9d3125490d Mon Sep 17 00:00:00 2001
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From: Roger Quadros <rogerq@ti.com>
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Date: Wed, 9 Oct 2013 15:08:59 +0300
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Subject: [PATCH] ata: ahci_platform: runtime resume the device before use
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On OMAP platforms the device needs to be runtime resumed before
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it can be accessed. The OMAP HWMOD framework takes care of
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enabling the module and its resources based on the
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device's runtime PM state.
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In this patch we runtime resume during .probe() and runtime suspend
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after .remove().
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We also update the runtime PM state during .resume().
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CC: Balaji T K <balajitk@ti.com>
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Signed-off-by: Roger Quadros <rogerq@ti.com>
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Signed-off-by: Hans de Goede <hdegoede@redhat.com>
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---
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drivers/ata/ahci.h | 1 +
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drivers/ata/ahci_platform.c | 15 +++++++++++++++
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2 files changed, 16 insertions(+)
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diff --git a/drivers/ata/ahci.h b/drivers/ata/ahci.h
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index 3ab7ac9..51af275b 100644
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--- a/drivers/ata/ahci.h
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+++ b/drivers/ata/ahci.h
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@@ -324,6 +324,7 @@ struct ahci_host_priv {
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u32 em_loc; /* enclosure management location */
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u32 em_buf_sz; /* EM buffer size in byte */
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u32 em_msg_type; /* EM message type */
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+ bool got_runtime_pm; /* Did we do pm_runtime_get? */
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struct clk *clks[AHCI_MAX_CLKS]; /* Optional */
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struct regulator *target_pwr; /* Optional */
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struct phy *phy; /* If platform uses phy */
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diff --git a/drivers/ata/ahci_platform.c b/drivers/ata/ahci_platform.c
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index 99d38c1..75698a4 100644
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--- a/drivers/ata/ahci_platform.c
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+++ b/drivers/ata/ahci_platform.c
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@@ -24,6 +24,7 @@
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#include <linux/libata.h>
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#include <linux/ahci_platform.h>
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#include <linux/phy/phy.h>
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+#include <linux/pm_runtime.h>
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#include "ahci.h"
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static void ahci_host_stop(struct ata_host *host);
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@@ -229,6 +230,11 @@ static void ahci_platform_put_resources(struct device *dev, void *res)
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struct ahci_host_priv *hpriv = res;
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int c;
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+ if (hpriv->got_runtime_pm) {
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+ pm_runtime_put_sync(dev);
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+ pm_runtime_disable(dev);
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+ }
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+
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for (c = 0; c < AHCI_MAX_CLKS && hpriv->clks[c]; c++)
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clk_put(hpriv->clks[c]);
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}
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@@ -326,6 +332,10 @@ struct ahci_host_priv *ahci_platform_get_resources(
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}
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}
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+ pm_runtime_enable(dev);
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+ pm_runtime_get_sync(dev);
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+ hpriv->got_runtime_pm = true;
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+
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devres_remove_group(dev, NULL);
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return hpriv;
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@@ -635,6 +645,11 @@ int ahci_platform_resume(struct device *dev)
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if (rc)
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goto disable_resources;
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+ /* We resumed so update PM runtime state */
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+ pm_runtime_disable(dev);
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+ pm_runtime_set_active(dev);
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+ pm_runtime_enable(dev);
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+
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return 0;
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disable_resources:
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--
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1.8.5.5
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