From mboxrd@z Thu Jan 1 00:00:00 1970 From: maxime.ripard@free-electrons.com (Maxime Ripard) Date: Wed, 19 Oct 2016 11:56:44 +0200 Subject: [PATCH] clk: sunxi-ng: sun6i-a31: Force AHB1 clock to use PLL6 as parent In-Reply-To: <20161018054209.24546-1-wens@csie.org> References: <20161018054209.24546-1-wens@csie.org> Message-ID: <20161019095644.336urfguu6azmmy3@lukather> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Tue, Oct 18, 2016 at 01:42:09PM +0800, Chen-Yu Tsai wrote: > On the A31, the DMA engine only works if AHB1 is clocked from PLL6. > In addition, the hstimer is clocked from AHB1, and if AHB1 is clocked > from the CPU clock, and cpufreq is working, we get an unstable timer. > > Force the AHB1 clock to use PLL6 as its parent. Previously this was done > in the device tree with the assigned-clocks and assigned-clocks-parent > bindings. However with this new monolithic driver, the system critical > clocks aren't exported through the device tree. The alternative is to > force this setting in the driver before the clocks are registered. > > This is also done in newer versions of mainline U-boot. But people still > using an older version, or even the vendor version, can still hit this > issue. Hence the need to do it in the kernel as well. > > Reported-by: Hans de Goede > Reported-by: Maxime Ripard > Fixes: c6e6c96d8fa6 ("clk: sunxi-ng: Add A31/A31s clocks") > Signed-off-by: Chen-Yu Tsai Applied, thanks! Maxime -- Maxime Ripard, Free Electrons Embedded Linux and Kernel engineering http://free-electrons.com -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 801 bytes Desc: not available URL: