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Re: [PATCH v2 1/3] clk: bcm2835: Don't rate change PLLs on behalf of DSI PLL dividers.

From Stephen Boyd <sboyd@codeaurora.org>
Newsgroups linux.kernel
Subject Re: [PATCH v2 1/3] clk: bcm2835: Don't rate change PLLs on behalf of DSI PLL dividers.
Date 2017-01-21 01:40 +0100
Message-ID <t1RSN-5Ms-5@gated-at.bofh.it> (permalink)
References <t0IHU-3fQ-5@gated-at.bofh.it>
Organization linux.* mail to news gateway

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On 01/18, Eric Anholt wrote:
> Our core PLLs are intended to be configured once and left alone.  With
> the SET_RATE_PARENT, asking to set the PLLD_DSI1 clock rate would
> change PLLD just to get closer to the requested DSI clock, thus
> changing PLLD_PER, the UART and ethernet PHY clock rates downstream of
> it, and breaking ethernet.
> 
> We *do* want PLLH to change so that PLLH_AUX can be exactly the value
> we want, though.  Thus, we need to have a per-divider policy of
> whether to pass rate changes up.
> 
> Signed-off-by: Eric Anholt <eric@anholt.net>
> ---

Applied to clk-next

-- 
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project

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Thread

[PATCH v2 1/3] clk: bcm2835: Don't rate change PLLs on behalf of DSI PLL dividers. Eric Anholt <eric@anholt.net> - 2017-01-17 21:40 +0100
  [PATCH v2 3/3] clk: bcm2835: Add leaf clock measurement support, disabled by default Eric Anholt <eric@anholt.net> - 2017-01-17 21:40 +0100
    Re: [PATCH v2 3/3] clk: bcm2835: Add leaf clock measurement support,  disabled by default Stephen Boyd <sboyd@codeaurora.org> - 2017-01-21 01:40 +0100
  [PATCH v2 2/3] clk: bcm2835: Register the DSI0/DSI1 pixel clocks. Eric Anholt <eric@anholt.net> - 2017-01-17 21:40 +0100
    Re: [PATCH v2 2/3] clk: bcm2835: Register the DSI0/DSI1 pixel clocks. Stephen Boyd <sboyd@codeaurora.org> - 2017-01-21 01:40 +0100
  Re: [PATCH v2 1/3] clk: bcm2835: Don't rate change PLLs on behalf of  DSI PLL dividers. Stephen Boyd <sboyd@codeaurora.org> - 2017-01-21 01:40 +0100

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