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From 6e52d15cd47c849567bfc2cb75ccf3c6513dc688 Mon Sep 17 00:00:00 2001
From: Nicholas Chin <nic.c3.14@gmail.com>
Date: Sun, 11 May 2025 16:28:23 -0600
Subject: [PATCH 43/43] mb/dell/snb_ivb_latitude: Disable EC initiated shutdown
at 87 degrees
If command 0xBF isn't sent, the EC will shut down the system without
warning once the CPU reaches approximately 87 degrees, without the
system thermal throttling first. Call the newly added function from the
MEC5035 code to send this command and disable this behavior.
Tested on the Latitude E6430.
Change-Id: I2b2dc1e3ab115e05d05eaac06892343394d37fdf
Signed-off-by: Nicholas Chin <nic.c3.14@gmail.com>
---
src/mainboard/dell/snb_ivb_latitude/early_init.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/src/mainboard/dell/snb_ivb_latitude/early_init.c b/src/mainboard/dell/snb_ivb_latitude/early_init.c
index ff83db095b..ef385a0a70 100644
--- a/src/mainboard/dell/snb_ivb_latitude/early_init.c
+++ b/src/mainboard/dell/snb_ivb_latitude/early_init.c
@@ -11,4 +11,9 @@ void bootblock_mainboard_early_init(void)
| KBC_LPC_EN | FDD_LPC_EN | LPT_LPC_EN
| COMB_LPC_EN | COMA_LPC_EN);
mec5035_early_init();
+
+ /* Observed from LPC logs with vendor firmware. Seems to disable
+ * EC-initiated shutdown when the CPU reaches approximately 87 degrees.
+ * The exact meaning of the parameter is currently unknown. */
+ mec5035_cmd_bf(0x07);
}
--
2.51.2
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