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From abe309ab531f22b9b89329bd825606f6b68a95a1 Mon Sep 17 00:00:00 2001
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From: Roger Quadros <rogerq@ti.com>
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Date: Sat, 22 Feb 2014 16:53:41 +0100
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Subject: [PATCH 118/182] ata: ahci_platform: runtime resume the device before
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use
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On OMAP platforms the device needs to be runtime resumed before it can
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be accessed. The OMAP HWMOD framework takes care of enabling the
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module and its resources based on the 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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Signed-off-by: Tejun Heo <tj@kernel.org>
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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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--- a/drivers/ata/ahci.h
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+++ b/drivers/ata/ahci.h
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@@ -325,6 +325,7 @@ 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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--- a/drivers/ata/ahci_platform.c
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+++ b/drivers/ata/ahci_platform.c
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@@ -23,6 +23,7 @@
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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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@@ -216,6 +217,11 @@ static void ahci_platform_put_resources(
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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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@@ -309,6 +315,10 @@ struct ahci_host_priv *ahci_platform_get
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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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@@ -603,6 +613,11 @@ int ahci_platform_resume(struct device *
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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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