linux-kernel - Re: [PATCH 01/11] dt-bindings: display: meson-dw-hdmi: Add compatible for S4 HDMI controller

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Message-ID: <a71f24c9-1f40-45a1-8fdb-6075bbf89930@amlogic.com>
Date: Fri, 21 Nov 2025 10:55:26 +0800
From: Ao Xu <ao.xu@...ogic.com>
To: Piotr Oniszczuk <piotr.oniszczuk@...il.com>,
 Chuan Liu <chuan.liu@...ogic.com>
Cc: Neil Armstrong <neil.armstrong@...aro.org>,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>,
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, Kevin Hilman <khilman@...libre.com>,
 Jerome Brunet <jbrunet@...libre.com>,
 Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
 dri-devel@...ts.freedesktop.org, linux-amlogic@...ts.infradead.org,
 devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH 01/11] dt-bindings: display: meson-dw-hdmi: Add compatible
 for S4 HDMI controller

Hi Piotr，

     I will check this issue

在 2025/11/19 18:27, Piotr Oniszczuk 写道:
> [You don't often get email from piotr.oniszczuk@...il.com. Learn why this is important at https://aka.ms/LearnAboutSenderIdentification ]
>
> [ EXTERNAL EMAIL ]
>
> Pls see inline
>
>> Wiadomość napisana przez Chuan Liu <chuan.liu@...ogic.com> w dniu 19 lis 2025, o godz. 03:57:
>>
>> Hi Piotr,
>>
>>
>> On 11/18/2025 10:50 PM, Piotr Oniszczuk wrote:
>>> [You don't often get email from piotr.oniszczuk@...il.com. Learn why this is important at https://aka.ms/LearnAboutSenderIdentification ]
>>> [ EXTERNAL EMAIL ]
>>> Ao,
>>> Is there any chance to get this s4 drm hdmi series for current 6.18?
>>> (i tried backport this series to 6.18 but have some issues with reparent vpu_0_sel to sysclk_b_sel)
>> Why do we need to reparent vpu_0_sel to sysclk_b_sel? is there any
>> background here?
> Well - it looks it is because bug....
> Martin Blumenstingl had perfect eye and catch typo in patch https://lore.kernel.org/all/20250110-drm-s4-v1-11-cbc2d5edaae8@amlogic.com/:
>
> By replacing:
> assigned-clock-parents = <&clkc_periphs CLKID_FCLK_DIV3>,
> <0>, /* Do Nothing */
> <&clkc_periphs CLKID_VPU_0>,
> <&clkc_periphs CLKID_FCLK_DIV4>,
> <0>, /* Do Nothing */
> <&clkc_periphs CLKID_VAPB_0>;
>
> with:
> assigned-clock-parents = <&clkc_pll CLKID_FCLK_DIV3>,
> <0>, /* Do Nothing */
> <&clkc_periphs CLKID_VPU_0>,
> <&clkc_pll CLKID_FCLK_DIV4>,
> <0>, /* Do Nothing */
> <&clkc_periphs CLKID_VAPB_0>;
>
> dmesg is like this https://termbin.com/6020
>
> So i'm getting hdmi working - but only when device boots _without_ connected hdmi at boot (and connected later)
> If hdmi is connected at boot - boot hangs at:
>
>      0.341676] meson-dw-hdmi fe300000.hdmi-tx: Detected HDMI TX controller v2.01a with HDCP (meson_dw_hdmi_phy)
> [    0.342750] meson-dw-hdmi fe300000.hdmi-tx: registered DesignWare HDMI I2C bus driver
> [    0.343660] meson-drm ff000000.vpu: bound fe300000.hdmi-tx (ops meson_dw_hdmi_ops)
> [    0.344832] [drm] Initialized meson 1.0.0 for ff000000.vpu on minor 0
>
> FYI: It is after applying https://patchwork.kernel.org/project/linux-amlogic/cover/20250110-drm-s4-v1-0-cbc2d5edaae8@amlogic.com/ on mainline 6.18 (with some my adjustments on this series required by changes in 6.18).
> For VPU clk changes see https://github.com/warpme/minimyth2/blob/master/script/kernel/linux-6.18/files/0312-drm-meson-add-vpu-clk-setting-for-S4.patch
> It is 6.18 adaptation of https://patchwork.kernel.org/project/linux-amlogic/patch/20250110-drm-s4-v1-9-cbc2d5edaae8@amlogic.com/
>
> As kernel hangs - i have limited caps to drill where root cause is.
>
> Maybe above hang is reason of my backports or missing any pre-req required to get s4 drm working?
> Anyway - it will be good to test with updated to 6.18 series of Add DRM support for Amlogic S4 (plus info about any pre-req required to get s4 drm working)
>
>
>> The vpu_clk on S4 doesn't support sysclk_b_sel as one of its
>> selectable clock sources, so this reparent operation will definitely
>> fail. This has nothing to do with the kernel version.
>>
>>>> Wiadomość napisana przez Ao Xu via B4 Relay <devnull+ao.xu.amlogic.com@...nel.org> w dniu 10 sty 2025, o godz. 06:39:
>>>>
>>>> From: Ao Xu <ao.xu@...ogic.com>
>>>>
>>>> Add devicetree document for S4 HDMI controller
>>>>
>>>> Signed-off-by: Ao Xu <ao.xu@...ogic.com>
>>>> ---
>>>> Documentation/devicetree/bindings/display/amlogic,meson-dw-hdmi.yaml | 1 +
>>>> 1 file changed, 1 insertion(+)
>>>>
>>>> diff --git a/Documentation/devicetree/bindings/display/amlogic,meson-dw-hdmi.yaml b/Documentation/devicetree/bindings/display/amlogic,meson-dw-hdmi.yaml
>>>> index 84d68b8cfccc86fd87a6a0fd2b70af12e51eb8a4..6e0a8369eee915fab55af24d450a6c40e08def38 100644
>>>> --- a/Documentation/devicetree/bindings/display/amlogic,meson-dw-hdmi.yaml
>>>> +++ b/Documentation/devicetree/bindings/display/amlogic,meson-dw-hdmi.yaml
>>>> @@ -55,6 +55,7 @@ properties:
>>>>            - const: amlogic,meson-gx-dw-hdmi
>>>>        - enum:
>>>>            - amlogic,meson-g12a-dw-hdmi # G12A (S905X2, S905Y2, S905D2)
>>>> +          - amlogic,meson-s4-dw-hdmi # S4 (S905Y4)
>>>>
>>>>    reg:
>>>>      maxItems: 1
>>>>
>>>> --
>>>> 2.43.0
>>>>
>>>>
>>>>
>>>> _______________________________________________
>>>> linux-amlogic mailing list
>>>> linux-amlogic@...ts.infradead.org
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>>> _______________________________________________
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>>> linux-amlogic@...ts.infradead.org
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