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Date:   Tue, 26 May 2020 18:44:55 -0700
From:   Stephen Boyd <>
        dillon min <>
Subject: Re: [PATCH v5 5/8] clk: stm32: Fix stm32f429's ltdc driver hang in set clock rate, fix duplicated ltdc clock register to 'clk_core' case ltdc's clock turn off by clk_disable_unused()

Quoting (2020-05-24 20:45:45)
> From: dillon min <>
> ltdc set clock rate crashed
>    'post_div_data[]''s pll_num is PLL_I2S, PLL_SAI (number is 1,2). but,

Please write "post_div_data[]'s" if it is possessive. "But" doesn't
start a sentence. This is one sentence, not two.

>     as pll_num is offset of 'clks[]' input to clk_register_pll_div(), which
>     is FCLK, CLK_LSI, defined in 'include/dt-bindings/clock/stm32fx-clock.h'
>     so, this is a null object at the register time.
>     then, in ltdc's clock is_enabled(), enable(), will call to_clk_gate().
>     will return a null object, cause kernel crashed.
>     need change pll_num to PLL_VCO_I2S, PLL_VCO_SAI for 'post_div_data[]'
>  duplicated ltdc clock
>    'stm32f429_gates[]' has a member 'ltdc' register to 'clk_core', but no
>     upper driver use it, ltdc driver use the lcd-tft defined in
>    'stm32f429_aux_clk[]'. after system startup, as stm32f429_gates[]'s ltdc
>     enable_count is zero, so turn off by clk_disable_unused()

I sort of follow this. Is this another patch? Seems like two things are
going on here.

> Changes since V3:
> 1 drop last wrong changes about 'CLK_IGNORE_UNUSED' patch
> 2 fix PLL_SAI mismatch with PLL_VCO_SAI

This change log goes under the --- below.

> Signed-off-by: dillon min <>

Any Fixes tag?

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