Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Subject: Re: [PATCH] arm: socfpga: execute cold reboot by default
To:     Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
Cc:     Marek Vasut <marek.vasut@gmail.com>,
        Dalon Westergreen <dalon.westergreen@linux.intel.com>,
        linux-arm-kernel@lists.infradead.org,
        Russell King <linux@armlinux.org.uk>,
        linux-kernel@vger.kernel.org
References: <20190503091507.6159-1-simon.k.r.goldschmidt@gmail.com>
From:   Dinh Nguyen <dinguyen@kernel.org>
Openpgp: preference=signencrypt
Autocrypt: addr=dinguyen@kernel.org; prefer-encrypt=mutual; keydata=
 mQINBFEnvWwBEAC44OQqJjuetSRuOpBMIk3HojL8dY1krl8T8GJjfgc/Gh97CfVbrqhV5yQ3
 Sk/MW9mxO9KNvQCbZtthfn62YHmroNwipjZ6wKOMfKdtJR4+8JW/ShIJYnrMfwN8Wki6O+5a
 yPNNCeENHleV0FLVXw3aACxOcjEzGJHYmg4UC+56rfoxPEhKF6aGBTV5aGKMtQy77ywuqt12
 c+hlRXHODmXdIeT2V4/u/AsFNAq6UFUEvHrVj+dMIyv2VhjRvkcESIGnG12ifPdU7v/+wom/
 smtfOAGojgTCqpwd0Ay2xFzgGnSCIFRHp0I/OJqhUcwAYEAdgHSBVwiyTQx2jP+eDu3Q0jI3
 K/x5qrhZ7lj8MmJPJWQOSYC4fYSse2oVO+2msoMTvMi3+Jy8k+QNH8LhB6agq7wTgF2jodwO
 yij5BRRIKttp4U62yUgfwbQtEUvatkaBQlG3qSerOzcdjSb4nhRPxasRqNbgkBfs7kqH02qU
 LOAXJf+y9Y1o6Nk9YCqb5EprDcKCqg2c8hUya8BYqo7y+0NkBU30mpzhaJXncbCMz3CQZYgV
 1TR0qEzMv/QtoVuuPtWH9RCC83J5IYw1uFUG4RaoL7Z03fJhxGiXx3/r5Kr/hC9eMl2he6vH
 8rrEpGGDm/mwZOEoG5D758WQHLGH4dTAATg0+ZzFHWBbSnNaSQARAQABtCFEaW5oIE5ndXll
 biA8ZGluZ3V5ZW5Aa2VybmVsLm9yZz6JAjgEEwECACIFAlbG5oQCGwMGCwkIBwMCBhUIAgkK
 CwQWAgMBAh4BAheAAAoJEBmUBAuBoyj0fIgQAICrZ2ceRWpkZv1UPM/6hBkWwOo3YkzSQwL+
 AH15hf9xx0D5mvzEtZ97ZoD0sAuB+aVIFwolet+nw49Q8HA3E/3j0DT7sIAqJpcPx3za+kKT
 twuQ4NkQTTi4q5WCpA5b6e2qzIynB50b3FA6bCjJinN06PxhdOixJGv1qDDmJ01fq2lA7/PL
 cny/1PIo6PVMWo9nf77L6iXVy8sK/d30pa1pjhMivfenIleIPYhWN1ZdRAkH39ReDxdqjQXN
 NHanNtsnoCPFsqeCLmuUwcG+XSTo/gEM6l2sdoMF4qSkD4DdrVf5rsOyN4KJAY9Uqytn4781
 n6l1NAQSRr0LPT5r6xdQ3YXIbwUfrBWh2nDPm0tihuHoH0CfyJMrFupSmjrKXF84F3cq0DzC
 yasTWUKyW/YURbWeGMpQH3ioDLvBn0H3AlVoSloaRzPudQ6mP4O8mY0DZQASGf6leM82V3t0
 Gw8MxY9tIiowY7Yl2bHqXCorPlcEYXjzBP32UOxIK7y7AQ1JQkcv6pZ0/6lX6hMshzi9Ydw0
 m8USfFRZb48gsp039gODbSMCQ2NfxBEyUPw1O9nertCMbIO/0bHKkP9aiHwg3BPwm3YL1UvM
 ngbze/8cyjg9pW3Eu1QAzMQHYkT1iiEjJ8fTssqDLjgJyp/I3YHYUuAf3i8SlcZTusIwSqnD
 uQINBFEnvWwBEADZqma4LI+vMqJYe15fxnX8ANw+ZuDeYHy17VXqQ7dA7n8E827ndnoXoBKB
 0n7smz1C0I9StarHQPYTUciMLsaUpedEfpYgqLa7eRLFPvk/cVXxmY8Pk+aO8zHafr8yrFB1
 cYHO3Ld8d/DvF2DuC3iqzmgXzaRQhvQZvJ513nveCa2zTPPCj5w4f/Qkq8OgCz9fOrf/CseM
 xcP3Jssyf8qTZ4CTt1L6McRZPA/oFNTTgS/KA22PMMP9i8E6dF0Nsj0MN0R7261161PqfA9h
 5c+BBzKZ6IHvmfwY+Fb0AgbqegOV8H/wQYCltPJHeA5y1kc/rqplw5I5d8Q6B29p0xxXSfaP
 UQ/qmXUkNQPNhsMnlL3wRoCol60IADiEyDJHVZRIl6U2K54LyYE1vkf14JM670FsUH608Hmk
 30FG8bxax9i+8Muda9ok/KR4Z/QPQukmHIN9jVP1r1C/aAEvjQ2PK9aqrlXCKKenQzZ8qbeC
 rOTXSuJgWmWnPWzDrMxyEyy+e84bm+3/uPhZjjrNiaTzHHSRnF2ffJigu9fDKAwSof6SwbeH
 eZcIM4a9Dy+Ue0REaAqFacktlfELeu1LVzMRvpIfPua8izTUmACTgz2kltTaeSxAXZwIziwY
 prPU3cfnAjqxFHO2TwEpaQOMf8SH9BSAaCXArjfurOF+Pi3lKwARAQABiQIfBBgBAgAJBQJR
 J71sAhsMAAoJEBmUBAuBoyj0MnIQAI+bcNsfTNltf5AbMJptDgzISZJrYCXuzOgv4+d1CubD
 83s0k6VJgsiCIEpvELQJsr58xB6l+o3yTBZRo/LViNLk0jF4CmCdXWjTyaQAIceEdlaeeTGH
 d5GqAud9rv9q1ERHTcvmoEX6pwv3m66ANK/dHdBV97vXacl+BjQ71aRiAiAFySbJXnqj+hZQ
 K8TCI/6TOtWJ9aicgiKpmh/sGmdeJCwZ90nxISvkxDXLEmJ1prvbGc74FGNVNTW4mmuNqj/p
 oNr0iHan8hjPNXwoyLNCtj3I5tBmiHZcOiHDUufHDyKQcsKsKI8kqW3pJlDSACeNpKkrjrib
 3KLQHSEhTQCt3ZUDf5xNPnFHOnBjQuGkumlmhkgD5RVguki39AP2BQYp/mdk1NCRQxz5PR1B
 2w0QaTgPY24chY9PICcMw+VeEgHZJAhuARKglxiYj9szirPd2kv4CFu2w6a5HNMdVT+i5Hov
 cJEJNezizexE0dVclt9OS2U9Xwb3VOjs1ITMEYUf8T1j83iiCCFuXqH4U3Eji0nDEiEN5Ac0
 Jn/EGOBG2qGyKZ4uOec9j5ABF7J6hyO7H6LJaX5bLtp0Z7wUbyVaR4UIGdIOchNgNQk4stfm
 JiyuXyoFl/1ihREfvUG/e7+VAAoOBnMjitE5/qUERDoEkkuQkMcAHyEyd+XZMyXY
Message-ID: <fd18f55e-2e18-44a3-7e76-e5e59984b729@kernel.org>
Date:   Tue, 7 May 2019 20:37:11 -0500
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101
 Thunderbird/60.6.1
MIME-Version: 1.0
In-Reply-To: <20190503091507.6159-1-simon.k.r.goldschmidt@gmail.com>
Content-Type: text/plain; charset=utf-8
Content-Language: en-US
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk


On 5/3/19 4:15 AM, Simon Goldschmidt wrote:
> This changes system reboot for socfpga to issue a cold reboot by
> default instead of a warm reboot.
> 
> Warm reboot can still be used by setting reboot_mode to
> REBOOT_WARM (e.g. via kernel command line 'reboot='), but this
> patch ensures cold reboot is issued for both REBOOT_COLD and
> REBOOT_HARD.
> 
> Also, cold reboot is more fail safe than warm reboot has some
> issues at least fo CSEL=0 and BSEL=qspi, where the boot rom does
> not set the qspi clock to a valid range.
> 
> Signed-off-by: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
> ---
> 
> See discussion in this thread on the u-boot ML:
> https://lists.denx.de/pipermail/u-boot/2019-April/367463.html
> ---
>  arch/arm/mach-socfpga/socfpga.c | 12 ++++++------
>  1 file changed, 6 insertions(+), 6 deletions(-)
> 
> diff --git a/arch/arm/mach-socfpga/socfpga.c b/arch/arm/mach-socfpga/socfpga.c
> index 816da0eb6..6abfbf140 100644
> --- a/arch/arm/mach-socfpga/socfpga.c
> +++ b/arch/arm/mach-socfpga/socfpga.c
> @@ -85,10 +85,10 @@ static void socfpga_cyclone5_restart(enum reboot_mode mode, const char *cmd)
>  
>  	temp = readl(rst_manager_base_addr + SOCFPGA_RSTMGR_CTRL);
>  
> -	if (mode == REBOOT_HARD)
> -		temp |= RSTMGR_CTRL_SWCOLDRSTREQ;
> -	else
> +	if (mode == REBOOT_WARM)
>  		temp |= RSTMGR_CTRL_SWWARMRSTREQ;
> +	else
> +		temp |= RSTMGR_CTRL_SWCOLDRSTREQ;
>  	writel(temp, rst_manager_base_addr + SOCFPGA_RSTMGR_CTRL);
>  }
>  
> @@ -98,10 +98,10 @@ static void socfpga_arria10_restart(enum reboot_mode mode, const char *cmd)
>  
>  	temp = readl(rst_manager_base_addr + SOCFPGA_A10_RSTMGR_CTRL);
>  
> -	if (mode == REBOOT_HARD)
> -		temp |= RSTMGR_CTRL_SWCOLDRSTREQ;
> -	else
> +	if (mode == REBOOT_WARM)
>  		temp |= RSTMGR_CTRL_SWWARMRSTREQ;
> +	else
> +		temp |= RSTMGR_CTRL_SWCOLDRSTREQ;
>  	writel(temp, rst_manager_base_addr + SOCFPGA_A10_RSTMGR_CTRL);
>  }
>  
> 

Applied, thanks! I think this patch needs to get back-ported into stable
kernel version as well, right?

Dinh