linux-kernel - [PATCH v2 1/3] ARM: dts: imx6qdl: Specify IMX6QDL_CLK

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Message-Id: <20190327063451.25629-1-andrew.smirnov@gmail.com>
Date:   Tue, 26 Mar 2019 23:34:49 -0700
From:   Andrey Smirnov <andrew.smirnov@...il.com>
To:     Shawn Guo <shawnguo@...nel.org>
Cc:     Andrey Smirnov <andrew.smirnov@...il.com>,
        Lucas Stach <l.stach@...gutronix.de>,
        Angus Ainslie <angus@...ea.ca>,
        Chris Healy <cphealy@...il.com>,
        Fabio Estevam <fabio.estevam@....com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 1/3] ARM: dts: imx6qdl: Specify IMX6QDL_CLK_IPG as "ipg" clock to SDMA

Since 25aaa75df1e6 SDMA driver uses clock rates of "ipg" and "ahb"
clock to determine if it needs to configure the IP block as operating
at 1:1 or 1:2 clock ratio (ACR bit in SDMAARM_CONFIG). Specifying both
clocks as IMX6QDL_CLK_SDMA result in driver incorrectly thinking that
ratio is 1:1 which results in broken SDMA functionality(this at least
breaks RAVE SP serdev driver on RDU2). Fix the code to specify
IMX6QDL_CLK_IPG as "ipg" clock for SDMA, to avoid detecting incorrect
clock ratio.

Fixes: 25aaa75df1e6 ("dmaengine: imx-sdma: add clock ratio 1:1 check")
Signed-off-by: Andrey Smirnov <andrew.smirnov@...il.com>
Reviewed-by: Lucas Stach <l.stach@...gutronix.de>
Cc: Angus Ainslie (Purism) <angus@...ea.ca>
Cc: Chris Healy <cphealy@...il.com>
Cc: Lucas Stach <l.stach@...gutronix.de>
Cc: Fabio Estevam <fabio.estevam@....com>
Cc: Shawn Guo <shawnguo@...nel.org>
Cc: linux-arm-kernel@...ts.infradead.org
Cc: linux-kernel@...r.kernel.org
---
 arch/arm/boot/dts/imx6qdl.dtsi | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/boot/dts/imx6qdl.dtsi b/arch/arm/boot/dts/imx6qdl.dtsi
index 9f9aa6e7ed0e..354feba077b2 100644
--- a/arch/arm/boot/dts/imx6qdl.dtsi
+++ b/arch/arm/boot/dts/imx6qdl.dtsi
@@ -949,7 +949,7 @@
 				compatible = "fsl,imx6q-sdma", "fsl,imx35-sdma";
 				reg = <0x020ec000 0x4000>;
 				interrupts = <0 2 IRQ_TYPE_LEVEL_HIGH>;
-				clocks = <&clks IMX6QDL_CLK_SDMA>,
+				clocks = <&clks IMX6QDL_CLK_IPG>,
 					 <&clks IMX6QDL_CLK_SDMA>;
 				clock-names = "ipg", "ahb";
 				#dma-cells = <3>;
-- 
2.20.1