linux-kernel - Re: [PATCH 1/2] arch: arm64: qcom: sdm845-shift-axolotl: fix Bluetooth firmware loading

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Date:   Thu, 9 Jun 2022 15:47:31 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Alexander Martinz <amartinz@...ftphones.com>
Cc:     ~postmarketos/upstreaming@...ts.sr.ht, phone-devel@...r.kernel.org,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Dylan Van Assche <me@...anvanassche.be>
Subject: Re: [PATCH 1/2] arch: arm64: qcom: sdm845-shift-axolotl: fix
 Bluetooth firmware loading

On Thu, 9 Jun 2022 at 12:54, Alexander Martinz <amartinz@...ftphones.com> wrote:
>
> From: Dylan Van Assche <me@...anvanassche.be>
>
> Add hsuart0 alias, firmware name and prevent garbage data on Bluetooth UART lines

hsuart aliases are not standard. Please use serialN alias instead.

> on the SHIFT 6mq based on the Qualcomm SDM845 chip.
> I discovered that these were missing by comparing the DTS with similar
> devices such as the Oneplus 6/6T and Dragonboard 845c.
>
> Signed-of-by: Dylan Van Assche <me@...anvanassche.be>
> Tested-by: Alexander Martinz <amartinz@...ftphones.com>
> ---
>  .../boot/dts/qcom/sdm845-shift-axolotl.dts    | 33 +++++++++++++++++++
>  1 file changed, 33 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/qcom/sdm845-shift-axolotl.dts b/arch/arm64/boot/dts/qcom/sdm845-shift-axolotl.dts
> index 103cc40816fd..fa72f23ef0c2 100644
> --- a/arch/arm64/boot/dts/qcom/sdm845-shift-axolotl.dts
> +++ b/arch/arm64/boot/dts/qcom/sdm845-shift-axolotl.dts
> @@ -20,6 +20,7 @@ / {
>
>         aliases {
>                 display0 = &framebuffer0;
> +               hsuart0 = &uart6;
>                 serial0 = &uart9;
>         };
>
> @@ -529,6 +530,32 @@ volume_down_resin: resin {
>         };
>  };
>
> +/*
> + * Prevent garbage data on bluetooth UART lines
> + */
> +&qup_uart6_default {
> +        pinmux {
> +                pins = "gpio45", "gpio46", "gpio47", "gpio48";
> +                function = "qup6";
> +        };

This chunk should probably go into sdm845.dtsi. I'd suggest either
adding a separate qup_uart6_4pin or just making qup_uart6_default the
4-pin UART.

> +
> +        cts {
> +                pins = "gpio45";

Then the label and 'pins' can go into the dtsi, while keeping just the
bias and drive-strength in the platform dtsi.

> +                bias-pull-down;
> +        };
> +
> +        rts-tx {
> +                pins = "gpio46", "gpio47";
> +                drive-strength = <2>;
> +                bias-disable;
> +        };
> +
> +        rx {
> +                pins = "gpio48";
> +                bias-pull-up;
> +        };
> +};
> +
>  &qup_uart9_default {
>         pinconf-rx {
>                 pins = "gpio5";
> @@ -667,6 +694,12 @@ &uart6 {
>         bluetooth {
>                 compatible = "qcom,wcn3990-bt";
>
> +               /*
> +                * This path is relative to the qca/
> +                * subdir under lib/firmware.
> +                */
> +               firmware-name = "axolotl/crnv21.bin";

Do you know what is the difference between axolotl's bin and the regular one?

> +
>                 vddio-supply = <&vreg_s4a_1p8>;
>                 vddxo-supply = <&vreg_l7a_1p8>;
>                 vddrf-supply = <&vreg_l17a_1p3>;

-- 
With best wishes
Dmitry