From: Tony Lindgren <tony-4v6yS6AI5VpBDgjK7y7TUQ@public.gmane.org>
To: Nishanth Menon <nm-l0cyMroinI0@public.gmane.org>
Cc: "Benoît Cousson"
<bcousson-rdvid1DuHRBWk0Htik3J/w@public.gmane.org>,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-omap-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: [PATCH] ARM: dts: AM57xx/DRA7: Update SoC voltage rail limits to match data sheet
Date: Tue, 26 Apr 2016 10:03:01 -0700 [thread overview]
Message-ID: <20160426170300.GC5995@atomide.com> (raw)
In-Reply-To: <1461140319-32026-1-git-send-email-nm-l0cyMroinI0@public.gmane.org>
* Nishanth Menon <nm-l0cyMroinI0@public.gmane.org> [160420 01:20]:
> As per the data sheet starting from SPRUHQ0H (Nov 2015 - Latest[1]),
> VDD_CORE can vary from 0.85v to 1.15v for AVS class0. VDD GPU/DSP
> et.al. can range from 0.85v to 1.25V with AVS class0
>
> Since dynamic voltage scaling is disabled for DRA7/AM57xx SoCs for
> all SoC rails other than MPU, the bootloader is responsible for
> setting up the AVS class0 voltage, however, with wrong voltage machine
> constraints in dtb, regulator framework will lower the voltage below
> the required voltage levels for certain samples in production flow.
> This can cause catastrophic failures which can be pretty hard to
> identify.
>
> Update board files which don't match required specification.
>
> [1] http://www.ti.com/product/AM5728/datasheet/specifications#SPRT637-7340
Applying into omap-for-v4.7/dt thanks. This does not apply to
v4.6-rc, so assuming this is not an urgent fix.
Regards,
Tony
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WARNING: multiple messages have this Message-ID (diff)
From: tony@atomide.com (Tony Lindgren)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] ARM: dts: AM57xx/DRA7: Update SoC voltage rail limits to match data sheet
Date: Tue, 26 Apr 2016 10:03:01 -0700 [thread overview]
Message-ID: <20160426170300.GC5995@atomide.com> (raw)
In-Reply-To: <1461140319-32026-1-git-send-email-nm@ti.com>
* Nishanth Menon <nm@ti.com> [160420 01:20]:
> As per the data sheet starting from SPRUHQ0H (Nov 2015 - Latest[1]),
> VDD_CORE can vary from 0.85v to 1.15v for AVS class0. VDD GPU/DSP
> et.al. can range from 0.85v to 1.25V with AVS class0
>
> Since dynamic voltage scaling is disabled for DRA7/AM57xx SoCs for
> all SoC rails other than MPU, the bootloader is responsible for
> setting up the AVS class0 voltage, however, with wrong voltage machine
> constraints in dtb, regulator framework will lower the voltage below
> the required voltage levels for certain samples in production flow.
> This can cause catastrophic failures which can be pretty hard to
> identify.
>
> Update board files which don't match required specification.
>
> [1] http://www.ti.com/product/AM5728/datasheet/specifications#SPRT637-7340
Applying into omap-for-v4.7/dt thanks. This does not apply to
v4.6-rc, so assuming this is not an urgent fix.
Regards,
Tony
WARNING: multiple messages have this Message-ID (diff)
From: Tony Lindgren <tony@atomide.com>
To: Nishanth Menon <nm@ti.com>
Cc: "Benoît Cousson" <bcousson@baylibre.com>,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org,
linux-omap@vger.kernel.org
Subject: Re: [PATCH] ARM: dts: AM57xx/DRA7: Update SoC voltage rail limits to match data sheet
Date: Tue, 26 Apr 2016 10:03:01 -0700 [thread overview]
Message-ID: <20160426170300.GC5995@atomide.com> (raw)
In-Reply-To: <1461140319-32026-1-git-send-email-nm@ti.com>
* Nishanth Menon <nm@ti.com> [160420 01:20]:
> As per the data sheet starting from SPRUHQ0H (Nov 2015 - Latest[1]),
> VDD_CORE can vary from 0.85v to 1.15v for AVS class0. VDD GPU/DSP
> et.al. can range from 0.85v to 1.25V with AVS class0
>
> Since dynamic voltage scaling is disabled for DRA7/AM57xx SoCs for
> all SoC rails other than MPU, the bootloader is responsible for
> setting up the AVS class0 voltage, however, with wrong voltage machine
> constraints in dtb, regulator framework will lower the voltage below
> the required voltage levels for certain samples in production flow.
> This can cause catastrophic failures which can be pretty hard to
> identify.
>
> Update board files which don't match required specification.
>
> [1] http://www.ti.com/product/AM5728/datasheet/specifications#SPRT637-7340
Applying into omap-for-v4.7/dt thanks. This does not apply to
v4.6-rc, so assuming this is not an urgent fix.
Regards,
Tony
next prev parent reply other threads:[~2016-04-26 17:03 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-20 8:18 [PATCH] ARM: dts: AM57xx/DRA7: Update SoC voltage rail limits to match data sheet Nishanth Menon
2016-04-20 8:18 ` Nishanth Menon
2016-04-20 8:18 ` Nishanth Menon
[not found] ` <1461140319-32026-1-git-send-email-nm-l0cyMroinI0@public.gmane.org>
2016-04-26 17:03 ` Tony Lindgren [this message]
2016-04-26 17:03 ` Tony Lindgren
2016-04-26 17:03 ` Tony Lindgren
[not found] ` <20160426170300.GC5995-4v6yS6AI5VpBDgjK7y7TUQ@public.gmane.org>
2016-04-26 17:05 ` Nishanth Menon
2016-04-26 17:05 ` Nishanth Menon
2016-04-26 17:05 ` Nishanth Menon
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