[PATCH 2/3] clk: sunxi-ng: a64: keep tcon0 clock rate when pll-video0's rate changes

[Frank Oltmanns]

On 2023-08-07 at 17:43:52 +0800, Icenowy Zheng <uwu at icenowy.me> wrote:
> 在 2023-08-07星期一的 11:36 +0200，Frank Oltmanns写道：
>> From: Icenowy Zheng <icenowy at aosc.io>
>>
>> Notify TCON0 clock (and in consequence PLL-MIPI by
>> CLK_SET_RATE_PARENT)
>> to reset when PLL-Video0 changes (because of HDMI PHY clk which is a
>> child of PLL-Video0 and has CLK_SET_RATE_PARENT set). In this way we
>> can
>> get clock tree to satisfy both pipelines.
>
> Well for fixing one's patch that contains SoB, use the following
> format:
>
> Signed-off-by: A <a at a.local>
> [B: fixed something]
> Signed-off-by: B <b at b.local>

Ah, okay. Will do. But I keep A in the "From: " line, correct?

Thanks,
  Frank

>> ---
>>  drivers/clk/sunxi-ng/ccu-sun50i-a64.c | 15 +++++++++++++++
>>  1 file changed, 15 insertions(+)
>>
>> diff --git a/drivers/clk/sunxi-ng/ccu-sun50i-a64.c
>> b/drivers/clk/sunxi-ng/ccu-sun50i-a64.c
>> index ef567775fc95..93beedb0428e 100644
>> --- a/drivers/clk/sunxi-ng/ccu-sun50i-a64.c
>> +++ b/drivers/clk/sunxi-ng/ccu-sun50i-a64.c
>> @@ -943,6 +943,17 @@ static struct ccu_mux_nb sun50i_a64_cpu_nb = {
>>         .bypass_index   = 1, /* index of 24 MHz oscillator */
>>  };
>>  
>> +/*
>> + * Since PLL-Video0 is an ancestor of both tcon0 and HDMI PYH, tcon0
>> clock will
>> + * conflict with HDMI PHY clock which is on another display
>> pipeline.
>> + *
>> + * Therefore, a notifier is required to restore the rate of TCON0
>> when the rate
>> + * of PLL-Video0 changed.
>> + */
>> +static struct ccu_rate_reset_nb sun50i_a64_pll_video0_reset_tcon0_nb
>> = {
>> +       .common         = &pll_video0_clk.common,
>> +};
>> +
>>  static int sun50i_a64_ccu_probe(struct platform_device *pdev)
>>  {
>>         void __iomem *reg;
>> @@ -978,6 +989,10 @@ static int sun50i_a64_ccu_probe(struct
>> platform_device *pdev)
>>         ccu_mux_notifier_register(pll_cpux_clk.common.hw.clk,
>>                                   &sun50i_a64_cpu_nb);
>>  
>> +       /* Reset the rate of TCON0 clock when PLL-VIDEO0 is changed
>> */
>> +       sun50i_a64_pll_video0_reset_tcon0_nb.target_clk =
>> tcon0_clk.common.hw.clk;
>> +       ccu_rate_reset_notifier_register(&sun50i_a64_pll_video0_reset
>> _tcon0_nb);
>> +
>>         return 0;
>>  }
>>  
>>