linux-kernel - Re: [PATCH v3 3/3] clk: qcom: add SM8550 DISPCC driver

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Message-ID: <56db233f-1488-4725-9253-b4d6246fd5b7@linaro.org>
Date:   Sat, 7 Oct 2023 01:47:42 +0200
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     neil.armstrong@...aro.org, Sophon Wu <wuxilin123@...il.com>
Cc:     Andy Gross <agross@...nel.org>, andersson@...nel.org,
        devicetree@...r.kernel.org,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org, mturquette@...libre.com,
        Rob Herring <robh+dt@...nel.org>, sboyd@...nel.org
Subject: Re: [PATCH v3 3/3] clk: qcom: add SM8550 DISPCC driver

On 3.10.2023 09:16, neil.armstrong@...aro.org wrote:
> Hi,
> 
> On 03/10/2023 04:17, Sophon Wu wrote:
>> On 09/01/2023 16:47, Neil Armstrong wrote:
>>
>>> Add support for the display clock controller found in SM8550
>>> based devices.
>>
>>> This clock controller feeds the Multimedia Display SubSystem (MDSS).
>>> This driver is based on the SM8450 support.
>>
>>> Signed-off-by: Neil Armstrong <neil.armstrong@...aro.org>
>>> Reviewed-by: Konrad Dybcio <konrad.dybcio@...aro.org>
>>> ---
>>
>> Hi Neil,
>>
>> I'm trying to enable display on SM8550 but having trouble with clocks. Do you
>> have any idea on this maybe? Full dmesg here: https://bpa.st/7E6Q
> 
> You may need to remove the cont-splash memory zone and the simple-framebuffer,
> if you leave the cont-splash the bootloader will leave the MDSS on and Linux
> will fail to take over and initialize the clocks.
Huh???

Does the bootloader poke at the devicetree to check for its presence
on this board!?

Konrad