linux-kernel - Re: [PATCH] clk: qcom: dispcc-sm8750: Drop incorrect CLK_SET_RATE

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Message-ID: <ktwnhspd2krxwzcswrqj7ffoyhdzplplosy3f6bu6gqrzi5uxj@i5xqxthpha4n>
Date: Wed, 29 Jan 2025 18:25:13 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc: Bjorn Andersson <andersson@...nel.org>, 
	Michael Turquette <mturquette@...libre.com>, Stephen Boyd <sboyd@...nel.org>, linux-arm-msm@...r.kernel.org, 
	linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] clk: qcom: dispcc-sm8750: Drop incorrect
 CLK_SET_RATE_PARENT on byte intf parent

On Wed, Jan 29, 2025 at 04:45:19PM +0100, Krzysztof Kozlowski wrote:
> The parent of disp_cc_mdss_byte0_intf_clk clock should not propagate up
> the rates, because this messes up entire clock hierarchy when setting
> clock rates in MSM DSI driver.
> 
> The dsi_link_clk_set_rate_6g() first sets entire clock hierarchy rates
> via dev_pm_opp_set_rate() on byte clock and then sets individual clock
> rates, like pixel and byte_intf clocks, to proper frequencies.  Having
> CLK_SET_RATE_PARENT caused that entire tree was re-calced and the byte
> clock received halved frequency.  Drop CLK_SET_RATE_PARENT to fix this
> and align with SM8550 and SM8650.
> 
> Fixes: f1080d8dab0f ("clk: qcom: dispcc-sm8750: Add SM8750 Display clock controller")
> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> 
> ---
> 
> Fix for v6.14-rcX.
> ---
>  drivers/clk/qcom/dispcc-sm8750.c | 2 --
>  1 file changed, 2 deletions(-)
> 

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>

-- 
With best wishes
Dmitry