50 lines
1.6 KiB
Diff
50 lines
1.6 KiB
Diff
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From d40bb283101fd9cf702e4944865aebef52c34185 Mon Sep 17 00:00:00 2001
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From: Djhg2000 <github@djhg2000.net>
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Date: Thu, 4 Mar 2021 20:08:12 +0100
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Subject: [PATCH] Add a 60ms delay before PWRKEY sequence
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This brings the power on sequence in line with the EG25-G Hardware Design
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datasheet, which states we need to wait at least 30 ms after VBAT becomes stable
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before pulling PWRKEY low (first action of the power on sequene).
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After this change the sequence becomes as follows:
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- Set RESET_N high
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- Wait 60 ms (double 30 ms)
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- Execute PWRKEY sequence
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60 ms was choosen because we don't know when VBAT becomes stable, but it should
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be much less than an additional 30 ms. Empirical evidence suggests PinePhone
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units with a healthy battery do not see serious side effects from not doing
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this, while the modem will fail to boot and/or throw random errors on boot with
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a worn out battery.
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---
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src/manager.c | 5 +++++
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1 file changed, 5 insertions(+)
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diff --git a/src/manager.c b/src/manager.c
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index aaa3905..a992572 100644
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--- a/src/manager.c
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+++ b/src/manager.c
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@@ -27,6 +27,9 @@
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#define EG25_DATADIR "/usr/share/eg25-manager"
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#endif
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+// Delay between setting GPIO and PWRKEY sequence (60ms)
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+#define MODEM_POWERON_DELAY 60000
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+
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static gboolean quit_app(struct EG25Manager *manager)
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{
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int i;
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@@ -86,6 +89,8 @@ static gboolean modem_start(struct EG25Manager *manager)
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if (should_boot) {
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g_message("Starting modem...");
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+ // Modem might crash on boot (especially with worn battery) if we don't delay here
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+ usleep(MODEM_POWERON_DELAY);
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gpio_sequence_poweron(manager);
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manager->modem_state = EG25_STATE_POWERED;
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} else {
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--
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GitLab
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