summaryrefslogtreecommitdiffstats
path: root/drivers
diff options
context:
space:
mode:
authorRobert Marko <robimarko@gmail.com>2023-08-16 18:45:39 +0200
committerBjorn Andersson <andersson@kernel.org>2023-09-20 20:00:08 +0200
commitff4aa3bc98258a240b9bbab53fd8d2fb8184c485 (patch)
tree38294a384961329fee49cb846cfbad96f4390646 /drivers
parentdt-bindings: firmware: qcom,scm: support indicating SDI default state (diff)
downloadlinux-ff4aa3bc98258a240b9bbab53fd8d2fb8184c485.tar.xz
linux-ff4aa3bc98258a240b9bbab53fd8d2fb8184c485.zip
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>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/firmware/qcom_scm.c30
-rw-r--r--drivers/firmware/qcom_scm.h1
2 files changed, 31 insertions, 0 deletions
diff --git a/drivers/firmware/qcom_scm.c b/drivers/firmware/qcom_scm.c
index ca52618e2a8d..c2c7fafef34b 100644
--- a/drivers/firmware/qcom_scm.c
+++ b/drivers/firmware/qcom_scm.c
@@ -451,6 +451,29 @@ int qcom_scm_set_remote_state(u32 state, u32 id)
}
EXPORT_SYMBOL_GPL(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 = {
@@ -1850,6 +1873,13 @@ static int qcom_scm_probe(struct platform_device *pdev)
if (download_mode)
qcom_scm_set_download_mode(true);
+
+ /*
+ * 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();
+
/*
* Initialize the QSEECOM interface.
*
diff --git a/drivers/firmware/qcom_scm.h b/drivers/firmware/qcom_scm.h
index e6e512bd57d1..7b68fa820495 100644
--- a/drivers/firmware/qcom_scm.h
+++ b/drivers/firmware/qcom_scm.h
@@ -80,6 +80,7 @@ extern int scm_legacy_call(struct device *dev, const struct qcom_scm_desc *desc,
#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