linux-kernel - [PATCH 3.19.y-ckt 080/146] clk: exynos5420: Restore GATE_BUS

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Message-Id: <1434579851-1719-81-git-send-email-kamal@canonical.com>
Date:	Wed, 17 Jun 2015 15:23:05 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Javier Martinez Canillas <javier.martinez@...labora.co.uk>,
	Sylwester Nawrocki <s.nawrocki@...sung.com>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.19.y-ckt 080/146] clk: exynos5420: Restore GATE_BUS_TOP on suspend

3.19.8-ckt2 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Javier Martinez Canillas <javier.martinez@...labora.co.uk>

commit 97372e5a99449b4fffa824a382ad6358066a9918 upstream.

Commit ae43b3289186 ("ARM: 8202/1: dmaengine: pl330: Add runtime Power
Management support v12") added pm support for the pl330 dma driver but
it makes the clock for the Exynos5420 MDMA0 DMA controller to be gated
during suspend and this in turn makes its parent clock aclk266_g2d to
be gated. But the clock needs to be ungated prior suspend to allow the
system to be suspend and resumed correctly.

Add GATE_BUS_TOP register to the list of registers to be restored when
the system enters into a suspend state so aclk266_g2d will be ungated.

Thanks to Abhilash Kesavan for figuring out that this was the issue.

Fixes: ae43b32 ("ARM: 8202/1: dmaengine: pl330: Add runtime Power Management support v12")
Signed-off-by: Javier Martinez Canillas <javier.martinez@...labora.co.uk>
Tested-by: Kevin Hilman <khilman@...aro.org>
Tested-by: Abhilash Kesavan <a.kesavan@...sung.com>
Acked-by: Tomasz Figa <tomasz.figa@...il.com>
Signed-off-by: Sylwester Nawrocki <s.nawrocki@...sung.com>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 drivers/clk/samsung/clk-exynos5420.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/clk/samsung/clk-exynos5420.c b/drivers/clk/samsung/clk-exynos5420.c
index 848d602..aab8241 100644
--- a/drivers/clk/samsung/clk-exynos5420.c
+++ b/drivers/clk/samsung/clk-exynos5420.c
@@ -271,6 +271,7 @@ static const struct samsung_clk_reg_dump exynos5420_set_clksrc[] = {
 	{ .offset = SRC_MASK_PERIC0,		.value = 0x11111110, },
 	{ .offset = SRC_MASK_PERIC1,		.value = 0x11111100, },
 	{ .offset = SRC_MASK_ISP,		.value = 0x11111000, },
+	{ .offset = GATE_BUS_TOP,		.value = 0xffffffff, },
 	{ .offset = GATE_BUS_DISP1,		.value = 0xffffffff, },
 	{ .offset = GATE_IP_PERIC,		.value = 0xffffffff, },
 };
-- 
1.9.1

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