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authorRussell King <rmk+kernel@armlinux.org.uk>2017-07-26 10:18:08 +0200
committerStephen Boyd <sboyd@codeaurora.org>2017-09-02 01:00:54 +0200
commit73c950da6ec523136090d6d4d6907a6ea8e8b67b (patch)
tree1c526ade4802ad9939bd7cdefa18b782333eb79c /Documentation
parentASoC: atmel-classd: remove aclk clock (diff)
downloadlinux-73c950da6ec523136090d6d4d6907a6ea8e8b67b.tar.xz
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clk: si5351: fix PLL reset
Changing the audio sample rate on the SolidRun Cubox disrupts the video output. The Si5351 provides both the video clock (using PLLA on output 0) and the audio clock (using PLLB on output 2). When the rate of clock output 2 is changed, it reconfigures PLLB, which results in both PLLA and PLLB being reset. The reset of PLLA causes clock output 0 to be disrupted, thereby causing a loss of sync by the attached display device. Hence, each time the audio sample rate changes (eg, when a video player starts up, or when starting to play music) the video display momentarily blanks while the Si5351 settles down. Prior to the commit below, this behaviour did not happen. Fix this by only resetting only the PLL which has been changed. Fixes: 6dc669a22c77 ("clk: si5351: Add PLL soft reset") Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk> Acked-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com> Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
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