linux-kernel - [PATCH v2 11/26] mmc: panic write: bypass clock gating

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Date:	Thu,  8 Nov 2012 15:06:09 +0200
From:	dragos.tatulea@...el.com
To:	linux-kernel@...r.kernel.org, linux-mmc@...r.kernel.org,
	cjb@...top.org
Cc:	kirill.shutemov@...ux.intel.com, irina.tirdea@...el.com,
	octavian.purdila@...el.com, tony.luck@...el.com,
	keescook@...omium.org, dragos.tatulea@...il.com,
	Adrian Hunter <adrian.hunter@...el.com>
Subject: [PATCH v2 11/26] mmc: panic write: bypass clock gating

From: Adrian Hunter <adrian.hunter@...el.com>

Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
Signed-off-by: Irina Tirdea <irina.tirdea@...el.com>
---
 drivers/mmc/core/core.c |    5 +++++
 drivers/mmc/core/host.c |    9 +++++++++
 2 files changed, 14 insertions(+)

diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index 204a9bd..f7552af 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -956,6 +956,11 @@ void mmc_set_ungated(struct mmc_host *host)
 {
 	unsigned long flags;
 
+	if (mmc_am_panic_task(host)) {
+		host->clk_gated = false;
+		return;
+	}
+
 	/*
 	 * We've been given a new frequency while the clock is gated,
 	 * so make sure we regard this as ungating it.
diff --git a/drivers/mmc/core/host.c b/drivers/mmc/core/host.c
index ee2e16b..6eda5a1 100644
--- a/drivers/mmc/core/host.c
+++ b/drivers/mmc/core/host.c
@@ -153,6 +153,12 @@ void mmc_host_clk_hold(struct mmc_host *host)
 {
 	unsigned long flags;
 
+	if (mmc_am_panic_task(host)) {
+		if (host->clk_gated)
+			mmc_ungate_clock(host);
+		return;
+	}
+
 	/* cancel any clock gating work scheduled by mmc_host_clk_release() */
 	cancel_delayed_work_sync(&host->clk_gate_work);
 	mutex_lock(&host->clk_gate_mutex);
@@ -200,6 +206,9 @@ void mmc_host_clk_release(struct mmc_host *host)
 {
 	unsigned long flags;
 
+	if (mmc_am_panic_task(host))
+		return;
+
 	spin_lock_irqsave(&host->clk_lock, flags);
 	host->clk_requests--;
 	if (mmc_host_may_gate_card(host->card) &&
-- 
1.7.9.5

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