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From: Stephen Boyd <sboyd@kernel.org>
To: Eric Anholt <eric@anholt.net>,
	Florian Fainelli <f.fainelli@gmail.com>,
	Mark Rutland <mark.rutland@arm.com>,
	Michael Turquette <mturquette@baylibre.com>,
	Ray Jui <rjui@broadcom.com>, Rob Herring <robh+dt@kernel.org>,
	Scott Branden <sbranden@broadcom.com>,
	Stefan Wahren <wahrenst@gmx.net>,
	Wolfram Sang <wsa@the-dreams.de>
Cc: bcm-kernel-feedback-list@broadcom.com,
	linux-arm-kernel@lists.infradead.org, linux-i2c@vger.kernel.org,
	linux-clk@vger.kernel.org, linux-rpi-kernel@lists.infradead.org,
	devicetree@vger.kernel.org, Stefan Wahren <wahrenst@gmx.net>
Subject: Re: [PATCH V2 06/13] clk: bcm2835: Mark PLLD_PER as CRITICAL
Date: Fri, 16 Aug 2019 10:39:33 -0700
Message-ID: <20190816173934.60509205F4@mail.kernel.org> (raw)
In-Reply-To: <1565713248-4906-7-git-send-email-wahrenst@gmx.net>

Quoting Stefan Wahren (2019-08-13 09:20:41)
> The VPU firmware assume that the PLLD_PER isn't modified by the ARM core.
> Otherwise this could cause firmware lookups. So mark the clock as critical
> to avoid this.
> 
> Signed-off-by: Stefan Wahren <wahrenst@gmx.net>
> ---
>  drivers/clk/bcm/clk-bcm2835.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/clk/bcm/clk-bcm2835.c b/drivers/clk/bcm/clk-bcm2835.c
> index fdf672a..b62052e 100644
> --- a/drivers/clk/bcm/clk-bcm2835.c
> +++ b/drivers/clk/bcm/clk-bcm2835.c
> @@ -1785,7 +1785,7 @@ static const struct bcm2835_clk_desc clk_desc_array[] = {
>                 .load_mask = CM_PLLD_LOADPER,
>                 .hold_mask = CM_PLLD_HOLDPER,
>                 .fixed_divider = 1,
> -               .flags = CLK_SET_RATE_PARENT),
> +               .flags = CLK_IS_CRITICAL | CLK_SET_RATE_PARENT),

Please add a comment in the code to the effect that is in the commit
text so we don't have to dig through commits to figure out why this
special CLK_IS_CRITICAL flag is here.

>         [BCM2835_PLLD_DSI0]     = REGISTER_PLL_DIV(
>                 SOC_ALL,
>                 .name = "plld_dsi0",

  reply index

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-13 16:20 [PATCH V2 00/13] ARM: Add minimal Raspberry Pi 4 support Stefan Wahren
2019-08-13 16:20 ` [PATCH V2 01/13] ARM: dts: bcm283x: Enable HDMI at board level Stefan Wahren
2019-08-13 16:20 ` [PATCH V2 02/13] ARM: dts: bcm283x: Move BCM2835/6/7 specific to bcm2835-common.dtsi Stefan Wahren
2019-08-13 16:20 ` [PATCH V2 03/13] dt-bindings: bcm2835-cprman: Add bcm2711 support Stefan Wahren
2019-08-16 17:41   ` Stephen Boyd
2019-08-27 16:00   ` Rob Herring
2019-08-13 16:20 ` [PATCH V2 04/13] clk: bcm2835: Introduce SoC specific clock registration Stefan Wahren
2019-08-13 16:20 ` [PATCH V2 05/13] clk: bcm2835: Add BCM2711_CLOCK_EMMC2 support Stefan Wahren
2019-09-12 17:24   ` Matthias Brugger
2019-09-12 18:52     ` Eric Anholt
2019-09-13  1:20       ` Stefan Wahren
2019-09-13  7:13         ` Matthias Brugger
2019-09-13 23:02           ` Florian Fainelli
2019-08-13 16:20 ` [PATCH V2 06/13] clk: bcm2835: Mark PLLD_PER as CRITICAL Stefan Wahren
2019-08-16 17:39   ` Stephen Boyd [this message]
2019-08-13 16:20 ` [PATCH V2 07/13] dt-bindings: i2c: bcm2835: Add brcm,bcm2711 compatible Stefan Wahren
2019-08-27 16:00   ` Rob Herring
2019-08-13 16:20 ` [PATCH V2 08/13] i2c: bcm2835: Avoid clk stretch quirk for BCM2711 Stefan Wahren
2019-08-14 19:36   ` Wolfram Sang
2019-08-17  7:32     ` Stefan Wahren
2019-08-17  8:30       ` Wolfram Sang
2019-08-13 16:20 ` [PATCH V2 09/13] dt-bindings: arm: Convert BCM2835 board/soc bindings to json-schema Stefan Wahren
2019-08-13 17:22   ` Rob Herring
2019-08-14 19:21     ` Stefan Wahren
2019-08-14 23:06       ` Rob Herring
2019-08-13 16:20 ` [PATCH V2 10/13] dt-bindings: arm: bcm2835: Add Raspberry Pi 4 to DT schema Stefan Wahren
2019-08-13 16:20 ` [PATCH V2 11/13] ARM: bcm: Add support for BCM2711 SoC Stefan Wahren
2019-09-10 14:13   ` Matthias Brugger
2019-08-13 16:20 ` [PATCH V2 12/13] ARM: dts: Add minimal Raspberry Pi 4 support Stefan Wahren
2019-08-13 16:20 ` [PATCH V2 13/13] MAINTAINERS: Add BCM2711 to BCM2835 ARCH Stefan Wahren
2019-08-13 20:42 ` [PATCH V2 00/13] ARM: Add minimal Raspberry Pi 4 support Eric Anholt

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