linux-kernel - [PATCH 3/5] clk: sun6i: Protect SDRAM gating bit

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Message-Id: <1393258967-4843-4-git-send-email-maxime.ripard@free-electrons.com>
Date:	Mon, 24 Feb 2014 17:22:45 +0100
From:	Maxime Ripard <maxime.ripard@...e-electrons.com>
To:	Emilio Lopez <emilio@...pez.com.ar>,
	Dan Williams <dan.j.williams@...el.com>,
	Vinod Koul <vinod.koul@...el.com>
Cc:	Mike Turquette <mturquette@...aro.org>,
	linux-arm-kernel@...ts.infradead.org, dmaengine@...r.kernel.org,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
	linux-sunxi@...glegroups.com,
	Maxime Ripard <maxime.ripard@...e-electrons.com>
Subject: [PATCH 3/5] clk: sun6i: Protect SDRAM gating bit

Prevent the SDRAM controller from being gated by force-enabling it in the clock
driver.

Signed-off-by: Maxime Ripard <maxime.ripard@...e-electrons.com>
---
 drivers/clk/sunxi/clk-sunxi.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/clk/sunxi/clk-sunxi.c b/drivers/clk/sunxi/clk-sunxi.c
index 6cfcd23..d9b4a41 100644
--- a/drivers/clk/sunxi/clk-sunxi.c
+++ b/drivers/clk/sunxi/clk-sunxi.c
@@ -1302,6 +1302,13 @@ static void __init sunxi_clock_protect(void)
 		clk_put(clk);
 	}
 
+	/* DDR Gating clock - sun6i */
+	clk = clk_get(NULL, "ahb1_sdram");
+	if (!IS_ERR(clk)) {
+		clk_prepare_enable(clk);
+		clk_put(clk);
+	}
+
 	/* CPU clocks - sun6i */
 	clk = clk_get(NULL, "cpu");
 	if (!IS_ERR(clk)) {
-- 
1.9.0

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