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Subject: Re: [PATCH 4/4] ARM: dts: Fix-up EMMC2 controller's frequency
To:     Nicolas Saenz Julienne <nsaenz@kernel.org>,
        linux-arm-kernel@lists.infradead.org, linux-mmc@vger.kernel.org,
        devicetree@vger.kernel.org, bcm-kernel-feedback-list@broadcom.com,
        linux-rpi-kernel@lists.infradead.org,
        Rob Herring <robh+dt@kernel.org>,
        Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Cc:     f.fainelli@gmail.com, phil@raspberrypi.com,
        tim.gover@raspberrypi.com, adrian.hunter@intel.com,
        sbranden@broadcom.com, alcooperx@gmail.com,
        linux-kernel@vger.kernel.org, ulf.hansson@linaro.org
References: <20210322185816.27582-1-nsaenz@kernel.org>
 <20210322185816.27582-5-nsaenz@kernel.org>
From:   Scott Branden <scott.branden@broadcom.com>
Message-ID: <13a62975-23a4-60d3-a740-9ef44edc74c3@broadcom.com>
Date:   Mon, 22 Mar 2021 12:06:09 -0700
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1st line of commit should be ARM: dts: bcm2711

On 2021-03-22 11:58 a.m., Nicolas Saenz Julienne wrote:
> From: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
> 
> Force emmc2's frequency to 150MHz as the default 100MHz (set by FW)
> seems to interfere with the VPU clock when setup at frequencies bigger
> than 500MHz (a pretty common case). This ends up causing unwarranted
> SDHCI CMD hangs  when no SD card is present.
> 
> Signed-off-by: Nicolas Saenz Julienne <nsaenz@kernel.org>
> ---
>  arch/arm/boot/dts/bcm2711-rpi-4-b.dts | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/bcm2711-rpi-4-b.dts b/arch/arm/boot/dts/bcm2711-rpi-4-b.dts
> index 3b4ab947492a..9aa8408d9960 100644
> --- a/arch/arm/boot/dts/bcm2711-rpi-4-b.dts
> +++ b/arch/arm/boot/dts/bcm2711-rpi-4-b.dts
> @@ -257,6 +257,12 @@ &emmc2 {
>  	vqmmc-supply = <&sd_io_1v8_reg>;
>  	vmmc-supply = <&sd_vcc_reg>;
>  	broken-cd;
> +	/*
> +	 * Force the frequency to 150MHz as the default 100MHz seems to
> +	 * interfere with the VPU clock when setup at frequencies bigger than
> +	 * 500MHz, causing unwarranted CMD hangs.
> +	 */
> +	clock-frequency = <150000000>;
>  	status = "okay";
>  };
>  
> 


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