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Date: Tue, 21 May 2024 14:35:47 +0100
From: Måns Rullgård <mans@...sr.com>
To: Frank Oltmanns <frank@...manns.dev>
Cc: Michael Turquette <mturquette@...libre.com>, Stephen Boyd
<sboyd@...nel.org>, Chen-Yu Tsai <wens@...e.org>, Jernej Skrabec
<jernej.skrabec@...il.com>, Samuel Holland <samuel@...lland.org>, Guido
Günther <agx@...xcpu.org>, Purism Kernel Team
<kernel@...i.sm>, Ondrej
Jirman <megi@....cz>, Neil Armstrong <neil.armstrong@...aro.org>, Jessica
Zhang <quic_jesszhan@...cinc.com>, Sam Ravnborg <sam@...nborg.org>,
Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, Maxime Ripard
<mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, David
Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>, Rob Herring
<robh+dt@...nel.org>, Krzysztof Kozlowski
<krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>,
linux-clk@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-sunxi@...ts.linux.dev, linux-kernel@...r.kernel.org,
dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
stable@...r.kernel.org
Subject: Re: [PATCH v4 1/5] clk: sunxi-ng: common: Support minimum and
maximum rate
Frank Oltmanns <frank@...manns.dev> writes:
> The Allwinner SoC's typically have an upper and lower limit for their
> clocks' rates. Up until now, support for that has been implemented
> separately for each clock type.
>
> Implement that functionality in the sunxi-ng's common part making use of
> the CCF rate liming capabilities, so that it is available for all clock
> types.
>
> Suggested-by: Maxime Ripard <mripard@...nel.org>
> Signed-off-by: Frank Oltmanns <frank@...manns.dev>
> Cc: stable@...r.kernel.org
> ---
> drivers/clk/sunxi-ng/ccu_common.c | 19 +++++++++++++++++++
> drivers/clk/sunxi-ng/ccu_common.h | 3 +++
> 2 files changed, 22 insertions(+)
This just landed in 6.6 stable, and it broke HDMI output on an A20 based
device, the clocks ending up all wrong as seen in this diff of
/sys/kernel/debug/clk/clk_summary:
@@ -70,16 +71,14 @@
apb1-i2c0 0 0 0 24000000 0
pll-gpu 0 0 0 1200000000 0
- pll-video1 3 3 1 159000000 0
+ pll-video1 2 2 1 159000000 0
hdmi 1 1 0 39750000 0
tcon0-ch1-sclk2 1 1 1 39750000 0
tcon0-ch1-sclk1 1 1 1 39750000 0
- pll-video1-2x 1 1 0 318000000 0
+ pll-video1-2x 0 0 0 318000000 0
- hdmi-tmds 2 2 0 39750000 0
- hdmi-ddc 1 1 0 1987500 0
pll-periph-base 2 2 0 1200000000 0
mbus 1 1 0 300000000 0
pll-periph-sata 0 0 0 100000000 0
@@ -199,7 +198,7 @@
ace 0 0 0 384000000 0
ve 0 0 0 384000000 0
- pll-video0 4 4 2 297000000 0
+ pll-video0 5 5 2 297000000 0
hdmi1 0 0 0 297000000 0
tcon1-ch1-sclk2 0 0 0 297000000 0
tcon1-ch1-sclk1 0 0 0 297000000 0
@@ -222,8 +221,10 @@
de-be0 1 1 1 297000000 0
- pll-video0-2x 0 0 0 594000000 0
+ pll-video0-2x 1 1 0 594000000 0
+ hdmi-tmds 2 2 0 594000000 0
+ hdmi-ddc 1 1 0 29700000 0
pll-audio-base 0 0 0 1500000 0
pll-audio-8x 0 0 0 3000000 0
i2s2 0 0 0 3000000 0
Reverting this commit makes it work again.
> diff --git a/drivers/clk/sunxi-ng/ccu_common.c b/drivers/clk/sunxi-ng/ccu_common.c
> index 8babce55302f..ac0091b4ce24 100644
> --- a/drivers/clk/sunxi-ng/ccu_common.c
> +++ b/drivers/clk/sunxi-ng/ccu_common.c
> @@ -44,6 +44,16 @@ bool ccu_is_better_rate(struct ccu_common *common,
> unsigned long current_rate,
> unsigned long best_rate)
> {
> + unsigned long min_rate, max_rate;
> +
> + clk_hw_get_rate_range(&common->hw, &min_rate, &max_rate);
> +
> + if (current_rate > max_rate)
> + return false;
> +
> + if (current_rate < min_rate)
> + return false;
> +
> if (common->features & CCU_FEATURE_CLOSEST_RATE)
> return abs(current_rate - target_rate) < abs(best_rate - target_rate);
>
> @@ -122,6 +132,7 @@ static int sunxi_ccu_probe(struct sunxi_ccu *ccu, struct device *dev,
>
> for (i = 0; i < desc->hw_clks->num ; i++) {
> struct clk_hw *hw = desc->hw_clks->hws[i];
> + struct ccu_common *common = hw_to_ccu_common(hw);
> const char *name;
>
> if (!hw)
> @@ -136,6 +147,14 @@ static int sunxi_ccu_probe(struct sunxi_ccu *ccu, struct device *dev,
> pr_err("Couldn't register clock %d - %s\n", i, name);
> goto err_clk_unreg;
> }
> +
> + if (common->max_rate)
> + clk_hw_set_rate_range(hw, common->min_rate,
> + common->max_rate);
> + else
> + WARN(common->min_rate,
> + "No max_rate, ignoring min_rate of clock %d - %s\n",
> + i, name);
> }
>
> ret = of_clk_add_hw_provider(node, of_clk_hw_onecell_get,
> diff --git a/drivers/clk/sunxi-ng/ccu_common.h b/drivers/clk/sunxi-ng/ccu_common.h
> index 942a72c09437..329734f8cf42 100644
> --- a/drivers/clk/sunxi-ng/ccu_common.h
> +++ b/drivers/clk/sunxi-ng/ccu_common.h
> @@ -31,6 +31,9 @@ struct ccu_common {
> u16 lock_reg;
> u32 prediv;
>
> + unsigned long min_rate;
> + unsigned long max_rate;
> +
> unsigned long features;
> spinlock_t *lock;
> struct clk_hw hw;
>
> --
>
> 2.44.0
>
--
Måns Rullgård
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