[PATCH] clk: meson: meson8b: Don't use MPLL1 as parent of vclk_in_sel

[PATCH] clk: meson: meson8b: Don't use MPLL1 as parent of vclk_in_sel

[Martin Blumenstingl]

MPLL1 is needed for audio output. Drop it from the vclk_in_sel parent
list so we only use the (mutable) vid_pll_final_div tree or one of the
(fixed) FCLK_DIV{3,4,5} clocks.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
---
 drivers/clk/meson/meson8b.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/meson/meson8b.c b/drivers/clk/meson/meson8b.c
index a844d35b553a..f8bd211db720 100644
--- a/drivers/clk/meson/meson8b.c
+++ b/drivers/clk/meson/meson8b.c
@@ -1154,6 +1154,10 @@ static struct clk_regmap meson8b_vid_pll_final_div = {
 	},
 };
 
+/*
+ * parent 0x6 is meson8b_mpll1 but we don't use it here because it's reserved
+ * for the audio outputs.
+ */
 static const struct clk_hw *meson8b_vclk_mux_parent_hws[] = {
 	&meson8b_vid_pll_final_div.hw,
 	&meson8b_fclk_div4.hw,
@@ -1161,7 +1165,6 @@ static const struct clk_hw *meson8b_vclk_mux_parent_hws[] = {
 	&meson8b_fclk_div5.hw,
 	&meson8b_vid_pll_final_div.hw,
 	&meson8b_fclk_div7.hw,
-	&meson8b_mpll1.hw,
 };
 
 static struct clk_regmap meson8b_vclk_in_sel = {
-- 
2.31.1

Re: [PATCH] clk: meson: meson8b: Don't use MPLL1 as parent of vclk_in_sel

[Jerome Brunet]

On Mon 24 May 2021 at 12:45, Martin Blumenstingl <martin.blumenstingl@googlemail.com> wrote:

> MPLL1 is needed for audio output. Drop it from the vclk_in_sel parent
> list so we only use the (mutable) vid_pll_final_div tree or one of the
> (fixed) FCLK_DIV{3,4,5} clocks.

Are the fixed ones actually needed ?

If the consumer actually lives on the vid_pll only, I'd prefer if you
could add CLK_SET_RATE_NOREPARENT and assign the proper parent in DT with
`assigned-clock-parents`

>
> Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
> ---
>  drivers/clk/meson/meson8b.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/clk/meson/meson8b.c b/drivers/clk/meson/meson8b.c
> index a844d35b553a..f8bd211db720 100644
> --- a/drivers/clk/meson/meson8b.c
> +++ b/drivers/clk/meson/meson8b.c
> @@ -1154,6 +1154,10 @@ static struct clk_regmap meson8b_vid_pll_final_div = {
>  	},
>  };
>  
> +/*
> + * parent 0x6 is meson8b_mpll1 but we don't use it here because it's reserved
> + * for the audio outputs.
> + */
>  static const struct clk_hw *meson8b_vclk_mux_parent_hws[] = {
>  	&meson8b_vid_pll_final_div.hw,
>  	&meson8b_fclk_div4.hw,
> @@ -1161,7 +1165,6 @@ static const struct clk_hw *meson8b_vclk_mux_parent_hws[] = {
>  	&meson8b_fclk_div5.hw,
>  	&meson8b_vid_pll_final_div.hw,
>  	&meson8b_fclk_div7.hw,
> -	&meson8b_mpll1.hw,
>  };
>  
>  static struct clk_regmap meson8b_vclk_in_sel = {

Re: [PATCH] clk: meson: meson8b: Don't use MPLL1 as parent of vclk_in_sel

[Martin Blumenstingl]

Hi Jerome,

On Mon, May 24, 2021 at 12:57 PM Jerome Brunet <jbrunet@baylibre.com> wrote:
>
>
> On Mon 24 May 2021 at 12:45, Martin Blumenstingl <martin.blumenstingl@googlemail.com> wrote:
>
> > MPLL1 is needed for audio output. Drop it from the vclk_in_sel parent
> > list so we only use the (mutable) vid_pll_final_div tree or one of the
> > (fixed) FCLK_DIV{3,4,5} clocks.
>
> Are the fixed ones actually needed ?
>
> If the consumer actually lives on the vid_pll only, I'd prefer if you
> could add CLK_SET_RATE_NOREPARENT and assign the proper parent in DT with
> `assigned-clock-parents`
you're right, only the vid_pll_final_div tree is used
I just tested it with assigned-clock-parents and
CLK_SET_RATE_NO_REPARENT and it's working fine. I'll send a v2 later
today

Thanks for this suggestion!


Best regards,
Martin