linux-kernel - [PATCH 4.15 037/122] x86/platform/intel-mid: Handle Intel Edison reboot correctly

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Message-Id: <20180307191734.481579047@linuxfoundation.org>
Date:   Wed,  7 Mar 2018 11:37:29 -0800
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Sebastian Panceac <sebastian@...in.io>,
        Thomas Gleixner <tglx@...utronix.de>,
        Andy Shevchenko <andy.shevchenko@...il.com>
Subject: [PATCH 4.15 037/122] x86/platform/intel-mid: Handle Intel Edison reboot correctly

4.15-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Sebastian Panceac <sebastian@...in.io>

commit 028091f82eefd5e84f81cef81a7673016ecbe78b upstream.

When the Intel Edison module is powered with 3.3V, the reboot command makes
the module stuck.  If the module is powered at a greater voltage, like 4.4V
(as the Edison Mini Breakout board does), reboot works OK.

The official Intel Edison BSP sends the IPCMSG_COLD_RESET message to the
SCU by default. The IPCMSG_COLD_BOOT which is used by the upstream kernel
is only sent when explicitely selected on the kernel command line.

Use IPCMSG_COLD_RESET unconditionally which makes reboot work independent
of the power supply voltage.

[ tglx: Massaged changelog ]

Fixes: bda7b072de99 ("x86/platform/intel-mid: Implement power off sequence")
Signed-off-by: Sebastian Panceac <sebastian@...in.io>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Acked-by: Andy Shevchenko <andy.shevchenko@...il.com>
Cc: stable@...r.kernel.org
Link: https://lkml.kernel.org/r/1519810849-15131-1-git-send-email-sebastian@resin.io
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/x86/platform/intel-mid/intel-mid.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/x86/platform/intel-mid/intel-mid.c
+++ b/arch/x86/platform/intel-mid/intel-mid.c
@@ -79,7 +79,7 @@ static void intel_mid_power_off(void)
 
 static void intel_mid_reboot(void)
 {
-	intel_scu_ipc_simple_command(IPCMSG_COLD_BOOT, 0);
+	intel_scu_ipc_simple_command(IPCMSG_COLD_RESET, 0);
 }
 
 static unsigned long __init intel_mid_calibrate_tsc(void)