Received-SPF: pass (google.com: domain of linux-kernel+bounces-102343-linux.lists.archive=gmail.com@vger.kernel.org designates 147.75.199.223 as permitted sender) client-ip=147.75.199.223;
From: Jernej =?utf-8?B?xaBrcmFiZWM=?= <jernej.skrabec@gmail.com>
To: Michael Turquette <mturquette@baylibre.com>,
 Stephen Boyd <sboyd@kernel.org>, Chen-Yu Tsai <wens@csie.org>,
 Samuel Holland <samuel@sholland.org>,
 Guido =?ISO-8859-1?Q?G=FCnther?= <agx@sigxcpu.org>,
 Purism Kernel Team <kernel@puri.sm>, Ondrej Jirman <megi@xff.cz>,
 Neil Armstrong <neil.armstrong@linaro.org>,
 Jessica Zhang <quic_jesszhan@quicinc.com>, Sam Ravnborg <sam@ravnborg.org>,
 Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
 Maxime Ripard <mripard@kernel.org>, Thomas Zimmermann <tzimmermann@suse.de>,
 David Airlie <airlied@gmail.com>, Daniel Vetter <daniel@ffwll.ch>,
 Rob Herring <robh+dt@kernel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
 Conor Dooley <conor+dt@kernel.org>, Frank Oltmanns <frank@oltmanns.dev>
Cc: linux-clk@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
 linux-sunxi@lists.linux.dev, linux-kernel@vger.kernel.org,
 dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org,
 Frank Oltmanns <frank@oltmanns.dev>, Diego Roversi <diegor@tiscali.it>,
 stable@vger.kernel.org
Subject:
 Re: [PATCH v4 2/5] clk: sunxi-ng: a64: Set minimum and maximum rate for
 PLL-MIPI
Date: Wed, 13 Mar 2024 19:18:18 +0100
Message-ID: <1784566.VLH7GnMWUR@jernej-laptop>
In-Reply-To: <20240310-pinephone-pll-fixes-v4-2-46fc80c83637@oltmanns.dev>
References:
 <20240310-pinephone-pll-fixes-v4-0-46fc80c83637@oltmanns.dev>
 <20240310-pinephone-pll-fixes-v4-2-46fc80c83637@oltmanns.dev>
Precedence: bulk
MIME-Version: 1.0
Content-Transfer-Encoding: 7Bit
Content-Type: text/plain; charset="utf-8"

Dne nedelja, 10. marec 2024 ob 14:21:12 CET je Frank Oltmanns napisal(a):
> When the Allwinner A64's TCON0 searches the ideal rate for the connected
> panel, it may happen that it requests a rate from its parent PLL-MIPI
> which PLL-MIPI does not support.
> 
> This happens for example on the Olimex TERES-I laptop where TCON0
> requests PLL-MIPI to change to a rate of several GHz which causes the
> panel to stay blank. It also happens on the pinephone where a rate of
> less than 500 MHz is requested which causes instabilities on some
> phones.
> 
> Set the minimum and maximum rate of Allwinner A64's PLL-MIPI according
> to the Allwinner User Manual.
> 
> Fixes: ca1170b69968 ("clk: sunxi-ng: a64: force select PLL_MIPI in TCON0 mux")
> Reported-by: Diego Roversi <diegor@tiscali.it>
> Closes: https://groups.google.com/g/linux-sunxi/c/Rh-Uqqa66bw
> Tested-by: Diego Roversi <diegor@tiscali.it>
> Cc: stable@vger.kernel.org
> Reviewed-by: Maxime Ripard <mripard@kernel.org>
> Signed-off-by: Frank Oltmanns <frank@oltmanns.dev>

Reviewed-by: Jernej Skrabec <jernej.skrabec@gmail.com>

Best regards,
Jernej

> ---
>  drivers/clk/sunxi-ng/ccu-sun50i-a64.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/clk/sunxi-ng/ccu-sun50i-a64.c b/drivers/clk/sunxi-ng/ccu-sun50i-a64.c
> index 8951ffc14ff5..6a4b2b9ef30a 100644
> --- a/drivers/clk/sunxi-ng/ccu-sun50i-a64.c
> +++ b/drivers/clk/sunxi-ng/ccu-sun50i-a64.c
> @@ -182,6 +182,8 @@ static struct ccu_nkm pll_mipi_clk = {
>  					      &ccu_nkm_ops,
>  					      CLK_SET_RATE_UNGATE | CLK_SET_RATE_PARENT),
>  		.features	= CCU_FEATURE_CLOSEST_RATE,
> +		.min_rate	= 500000000,
> +		.max_rate	= 1400000000,
>  	},
>  };
>  
> 
>