Thx!
btw: i found that enabling CONFIG_FRAMEBUFFER_CONSOLE_DEFERRED_TAKEOVER
results with:
-no anymore boot hang on s4 (with connected hdmi)
-still black screen at s4 boot (with connected hdmi)
-breaks boot-splash for me on other platforms (allwinner, rockchip)
maybe s4 drm series i'm using is not ready for 6.18 change of fbdev framework
to DRM?
> Wiadomość napisana przez Ao Xu <[email protected]> w dniu 21 lis 2025, o
> godz. 03:55:
>
> Hi Piotr，
>
> I will check this issue
>
> 在 2025/11/19 18:27, Piotr Oniszczuk 写道:
>> [You don't often get email from [email protected]. Learn why this is
>> important at https://aka.ms/LearnAboutSenderIdentification ]
>>
>> [ EXTERNAL EMAIL ]
>>
>> Pls see inline
>>
>>> Wiadomość napisana przez Chuan Liu <[email protected]> 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 [email protected]. 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/[email protected]/:
>>
>> 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/[email protected]/
>> 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/[email protected]/
>>
>> 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
>>>>> <[email protected]> w dniu 10 sty 2025, o godz. 06:39:
>>>>>
>>>>> From: Ao Xu <[email protected]>
>>>>>
>>>>> Add devicetree document for S4 HDMI controller
>>>>>
>>>>> Signed-off-by: Ao Xu <[email protected]>
>>>>> ---
>>>>> 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
>>>>> [email protected]
>>>>> http://lists.infradead.org/mailman/listinfo/linux-amlogic
>>>> _______________________________________________
>>>> linux-amlogic mailing list
>>>> [email protected]
>>>> http://lists.infradead.org/mailman/listinfo/linux-amlogic
