linux-kernel - Re: [PATCH 5.14 05/30] interconnect: qcom: sdm660: Add missing a2noc qos clocks

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Date:   Fri, 15 Oct 2021 14:24:52 +0300
From:   Georgi Djakov <djakov@...nel.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org
Cc:     stable@...r.kernel.org, Shawn Guo <shawn.guo@...aro.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...ainline.org>,
        Sasha Levin <sashal@...nel.org>
Subject: Re: [PATCH 5.14 05/30] interconnect: qcom: sdm660: Add missing a2noc
 qos clocks

Hi Greg,

On 14.10.21 17:54, Greg Kroah-Hartman wrote:
> From: Shawn Guo <shawn.guo@...aro.org>
> 
> [ Upstream commit 13404ac8882f5225af07545215f4975a564c3740 ]
> 
> It adds the missing a2noc clocks required for QoS registers programming
> per downstream kernel[1].  Otherwise, qcom_icc_noc_set_qos_priority()
> call on mas_ufs or mas_usb_hs node will simply result in a hardware hang
> on SDM660 SoC.
> 
> [1] https://source.codeaurora.org/quic/la/kernel/msm-4.4/tree/arch/arm/boot/dts/qcom/sdm660-bus.dtsi?h=LA.UM.8.2.r1-04800-sdm660.0#n43
> 
> Signed-off-by: Shawn Guo <shawn.guo@...aro.org>
> Tested-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...ainline.org>
> Link: https://lore.kernel.org/r/20210824043435.23190-3-shawn.guo@linaro.org
> Signed-off-by: Georgi Djakov <djakov@...nel.org>
> Signed-off-by: Sasha Levin <sashal@...nel.org>

There is no benefit to backport this change, as devices that
needed it, would not boot on v5.14 anyways. Please drop it.

Thanks,
Georgi

> ---
>   drivers/interconnect/qcom/sdm660.c | 14 ++++++++++++++
>   1 file changed, 14 insertions(+)
> 
> diff --git a/drivers/interconnect/qcom/sdm660.c b/drivers/interconnect/qcom/sdm660.c
> index 99eef7e2d326..fb23a5b780a4 100644
> --- a/drivers/interconnect/qcom/sdm660.c
> +++ b/drivers/interconnect/qcom/sdm660.c
> @@ -173,6 +173,16 @@ static const struct clk_bulk_data bus_mm_clocks[] = {
>   	{ .id = "iface" },
>   };
>   
> +static const struct clk_bulk_data bus_a2noc_clocks[] = {
> +	{ .id = "bus" },
> +	{ .id = "bus_a" },
> +	{ .id = "ipa" },
> +	{ .id = "ufs_axi" },
> +	{ .id = "aggre2_ufs_axi" },
> +	{ .id = "aggre2_usb3_axi" },
> +	{ .id = "cfg_noc_usb2_axi" },
> +};
> +
>   /**
>    * struct qcom_icc_provider - Qualcomm specific interconnect provider
>    * @provider: generic interconnect provider
> @@ -809,6 +819,10 @@ static int qnoc_probe(struct platform_device *pdev)
>   		qp->bus_clks = devm_kmemdup(dev, bus_mm_clocks,
>   					    sizeof(bus_mm_clocks), GFP_KERNEL);
>   		qp->num_clks = ARRAY_SIZE(bus_mm_clocks);
> +	} else if (of_device_is_compatible(dev->of_node, "qcom,sdm660-a2noc")) {
> +		qp->bus_clks = devm_kmemdup(dev, bus_a2noc_clocks,
> +					    sizeof(bus_a2noc_clocks), GFP_KERNEL);
> +		qp->num_clks = ARRAY_SIZE(bus_a2noc_clocks);
>   	} else {
>   		if (of_device_is_compatible(dev->of_node, "qcom,sdm660-bimc"))
>   			qp->is_bimc_node = true;
>