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Message-ID: <3f921a53-8eac-48e6-be17-43c07a0313d0@linaro.org>
Date:   Sat, 9 Dec 2023 18:54:16 +0100
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Subject: Re: [PATCH 2/2] interconnect: qcom: Add MSM8909 interconnect provider
 driver
Content-Language: en-US
To:     Stephan Gerhold <stephan.gerhold@kernkonzept.com>,
        Georgi Djakov <djakov@kernel.org>
Cc:     Andy Gross <agross@kernel.org>,
        Bjorn Andersson <andersson@kernel.org>,
        Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Conor Dooley <conor+dt@kernel.org>,
        linux-arm-msm@vger.kernel.org, linux-pm@vger.kernel.org,
        devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
        Adam Skladowski <a39.skl@gmail.com>
References: <20231206-icc-msm8909-v1-0-fe0dd632beff@kernkonzept.com>
 <20231206-icc-msm8909-v1-2-fe0dd632beff@kernkonzept.com>
From:   Konrad Dybcio <konrad.dybcio@linaro.org>
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In-Reply-To: <20231206-icc-msm8909-v1-2-fe0dd632beff@kernkonzept.com>
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On 6.12.2023 15:35, Stephan Gerhold wrote:
> From: Adam Skladowski <a39.skl@gmail.com>
> 
> Add driver for interconnect busses found in MSM8909 based platforms.
> The topology consists of three NoCs that are partially controlled by a
> RPM processor.
> 
> In the downstream/vendor kernel from Qualcomm there is an additional
> "mm-snoc". However, it doesn't have a separate RPM clock assigned. It
> looks like this is actually the same NoC in hardware and the "mm-snoc"
> was only defined to assign a different "qcom,util-fact". In mainline we
> can represent this by assigning the equivalent "ab_coeff" to all the
> nodes that are part of "mm-snoc" downstream.
Worth mentioning that snoc_mm used the same clock as snoc, which is not
obvious with some of these older designs:

static DEFINE_CLK_VOTER(snoc_msmbus_a_clk,  &snoc_a_clk.c,  LONG_MAX);
static DEFINE_CLK_VOTER(snoc_mm_msmbus_a_clk,  &snoc_a_clk.c,  LONG_MAX);

[...]

> +
> +static struct platform_driver msm8909_noc_driver = {
> +	.probe = qnoc_probe,
> +	.remove = qnoc_remove,
> +	.driver = {
> +		.name = "qnoc-msm8909",
> +		.of_match_table = msm8909_noc_of_match,
> +		.sync_state = icc_sync_state,
> +	},
> +};
> +module_platform_driver(msm8909_noc_driver);
And you may want this to be a bit higher up in the food chain!

Otherwise I don't see anything obviously wrong, I assume you tested
this without clk/pd_ignore_unused, with rpmcc cleanup and can confirm
the QoS programming went through without angry resets.

Konrad