On Fri, Mar 29, 2019 at 1:49 AM Andrey Smirnov <andrew.smir...@gmail.com> wrote: > > 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 results in driver incorrectly thinking that > ratio is 1:1 which results in broken SDMA funtionality(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. > Thank you for this! I the 5.1 kernel is the first revision to include the i.MX6 kit from Logic PD and I thought I messed something up, so I was off in a completely different direction trying to figure out why it was broken. With your patch, my board works again!
> Fixes: 25aaa75df1e6 ("dmaengine: imx-sdma: add clock ratio 1:1 check") > Signed-off-by: Andrey Smirnov <andrew.smir...@gmail.com> > Reviewed-by: Lucas Stach <l.st...@pengutronix.de> Tested-by: Adam Ford <aford...@gmail.com> #imx6q-logicpd > Cc: Angus Ainslie (Purism) <an...@akkea.ca> > Cc: Chris Healy <cphe...@gmail.com> > Cc: Lucas Stach <l.st...@pengutronix.de> > Cc: Fabio Estevam <fabio.este...@nxp.com> > Cc: Shawn Guo <shawn...@kernel.org> > Cc: linux-arm-ker...@lists.infradead.org > Cc: linux-kernel@vger.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 > > > _______________________________________________ > linux-arm-kernel mailing list > linux-arm-ker...@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel