[3.19.y-ckt stable] Patch "clk: exynos5420: Restore GATE_BUS_TOP on suspend" has been added to staging queue

[Kamal Mostafa]

This is a note to let you know that I have just added a patch titled

    clk: exynos5420: Restore GATE_BUS_TOP on suspend

to the linux-3.19.y-queue branch of the 3.19.y-ckt extended stable tree 
which can be found at:

    http://kernel.ubuntu.com/git/ubuntu/linux.git/log/?h=linux-3.19.y-queue

This patch is scheduled to be released in version 3.19.8-ckt2.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.19.y-ckt tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Kamal

------

>From 3a20ed3b458ef8571bd53a1a22527f336944977a Mon Sep 17 00:00:00 2001
From: Javier Martinez Canillas <javier.martinez at collabora.co.uk>
Date: Wed, 8 Apr 2015 07:34:12 +0200
Subject: clk: exynos5420: Restore GATE_BUS_TOP on suspend

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 at collabora.co.uk>
Tested-by: Kevin Hilman <khilman at linaro.org>
Tested-by: Abhilash Kesavan <a.kesavan at samsung.com>
Acked-by: Tomasz Figa <tomasz.figa at gmail.com>
Signed-off-by: Sylwester Nawrocki <s.nawrocki at samsung.com>
Signed-off-by: Kamal Mostafa <kamal at canonical.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