mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-21 06:33:41 +00:00
84 lines
2.8 KiB
Diff
84 lines
2.8 KiB
Diff
|
From ff4aa3bc98258a240b9bbab53fd8d2fb8184c485 Mon Sep 17 00:00:00 2001
|
||
|
|
From: Robert Marko <robimarko@gmail.com>
|
||
|
|
Date: Wed, 16 Aug 2023 18:45:39 +0200
|
||
|
|
Subject: [PATCH] firmware: qcom_scm: disable SDI if required
|
||
|
|
|
||
|
|
IPQ5018 has SDI (Secure Debug Image) enabled by TZ by default, and that
|
||
|
|
means that WDT being asserted or just trying to reboot will hang the board
|
||
|
|
in the debug mode and only pulling the power and repowering will help.
|
||
|
|
Some IPQ4019 boards like Google WiFI have it enabled as well.
|
||
|
|
|
||
|
|
Luckily, SDI can be disabled via an SCM call.
|
||
|
|
|
||
|
|
So, lets use the boolean DT property to identify boards that have SDI
|
||
|
|
enabled by default and use the SCM call to disable SDI during SCM probe.
|
||
|
|
It is important to disable it as soon as possible as we might have a WDT
|
||
|
|
assertion at any time which would then leave the board in debug mode,
|
||
|
|
thus disabling it during SCM removal is not enough.
|
||
|
|
|
||
|
|
Signed-off-by: Robert Marko <robimarko@gmail.com>
|
||
|
|
Reviewed-by: Guru Das Srinagesh <quic_gurus@quicinc.com>
|
||
|
|
Link: https://lore.kernel.org/r/20230816164641.3371878-2-robimarko@gmail.com
|
||
|
|
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
|
||
|
|
---
|
||
|
|
drivers/firmware/qcom_scm.c | 30 ++++++++++++++++++++++++++++++
|
||
|
|
drivers/firmware/qcom_scm.h | 1 +
|
||
|
|
2 files changed, 31 insertions(+)
|
||
|
|
|
||
|
|
--- a/drivers/firmware/qcom_scm.c
|
||
|
|
+++ b/drivers/firmware/qcom_scm.c
|
||
|
|
@@ -400,6 +400,29 @@ int qcom_scm_set_remote_state(u32 state,
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL(qcom_scm_set_remote_state);
|
||
|
|
|
||
|
|
+static int qcom_scm_disable_sdi(void)
|
||
|
|
+{
|
||
|
|
+ int ret;
|
||
|
|
+ struct qcom_scm_desc desc = {
|
||
|
|
+ .svc = QCOM_SCM_SVC_BOOT,
|
||
|
|
+ .cmd = QCOM_SCM_BOOT_SDI_CONFIG,
|
||
|
|
+ .args[0] = 1, /* Disable watchdog debug */
|
||
|
|
+ .args[1] = 0, /* Disable SDI */
|
||
|
|
+ .arginfo = QCOM_SCM_ARGS(2),
|
||
|
|
+ .owner = ARM_SMCCC_OWNER_SIP,
|
||
|
|
+ };
|
||
|
|
+ struct qcom_scm_res res;
|
||
|
|
+
|
||
|
|
+ ret = qcom_scm_clk_enable();
|
||
|
|
+ if (ret)
|
||
|
|
+ return ret;
|
||
|
|
+ ret = qcom_scm_call(__scm->dev, &desc, &res);
|
||
|
|
+
|
||
|
|
+ qcom_scm_clk_disable();
|
||
|
|
+
|
||
|
|
+ return ret ? : res.result[0];
|
||
|
|
+}
|
||
|
|
+
|
||
|
|
static int __qcom_scm_set_dload_mode(struct device *dev, bool enable)
|
||
|
|
{
|
||
|
|
struct qcom_scm_desc desc = {
|
||
|
|
@@ -1404,6 +1427,13 @@ static int qcom_scm_probe(struct platfor
|
||
|
|
|
||
|
|
__get_convention();
|
||
|
|
|
||
|
|
+
|
||
|
|
+ /*
|
||
|
|
+ * Disable SDI if indicated by DT that it is enabled by default.
|
||
|
|
+ */
|
||
|
|
+ if (of_property_read_bool(pdev->dev.of_node, "qcom,sdi-enabled"))
|
||
|
|
+ qcom_scm_disable_sdi();
|
||
|
|
+
|
||
|
|
/*
|
||
|
|
* If requested enable "download mode", from this point on warmboot
|
||
|
|
* will cause the boot stages to enter download mode, unless
|
||
|
|
--- a/drivers/firmware/qcom_scm.h
|
||
|
|
+++ b/drivers/firmware/qcom_scm.h
|
||
|
|
@@ -77,6 +77,7 @@ extern int scm_legacy_call(struct device
|
||
|
|
#define QCOM_SCM_SVC_BOOT 0x01
|
||
|
|
#define QCOM_SCM_BOOT_SET_ADDR 0x01
|
||
|
|
#define QCOM_SCM_BOOT_TERMINATE_PC 0x02
|
||
|
|
+#define QCOM_SCM_BOOT_SDI_CONFIG 0x09
|
||
|
|
#define QCOM_SCM_BOOT_SET_DLOAD_MODE 0x10
|
||
|
|
#define QCOM_SCM_BOOT_SET_ADDR_MC 0x11
|
||
|
|
#define QCOM_SCM_BOOT_SET_REMOTE_STATE 0x0a
|