linux-kernel - [PATCH 1/1] x86: Fix Intel Edison module stuck reboot

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Date:   Tue, 27 Feb 2018 12:07:00 +0200
From:   Sebastian Panceac <sebastian@...in.io>
To:     andy.shevchenko@...il.com
Cc:     Sebastian Panceac <sebastian@...in.io>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 1/1] x86: Fix Intel Edison module stuck reboot

Hi Andy,

I fixed the commit description according to your suggestions and used git send-email.

Regards!

When powering Intel Edison module 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.

This patch copies the behaviour from the official Intel Edison BSP,
where "IPCMSG_COLD_RESET" message
was sent to SCU by default at reboot time.

In the official BSP, sending the "IPCMSG_COLD_BOOT" message instead
of "IPCMSG_COLD_RESET" was possible,
by using a kernel command line parameter.

Signed-off-by: Sebastian Panceac <sebastian@...in.io>
---
 arch/x86/platform/intel-mid/intel-mid.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/platform/intel-mid/intel-mid.c b/arch/x86/platform/intel-mid/intel-mid.c
index 2c67bae..fb1df94 100644
--- 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)
-- 
2.7.4