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a93ec36630
See my upstream RFC of this: https://lore.kernel.org/linux-arm-msm/20200721080054.2803881-1-computersforpeace@gmail.com/ This fixes warm boot (reboot) for Google WiFi devices using their factory bootloader/firmware. I may resend this upstream eventually. Signed-off-by: Brian Norris <computersforpeace@gmail.com>
48 lines
1.3 KiB
Diff
48 lines
1.3 KiB
Diff
--- a/drivers/firmware/qcom_scm.c
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+++ b/drivers/firmware/qcom_scm.c
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@@ -404,6 +404,20 @@ static int __qcom_scm_set_dload_mode(str
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return qcom_scm_call_atomic(__scm->dev, &desc, NULL);
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}
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+static int __qcom_scm_disable_sdi(struct device *dev)
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+{
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+ struct qcom_scm_desc desc = {
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+ .svc = QCOM_SCM_SVC_BOOT,
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+ .cmd = QCOM_SCM_BOOT_CONFIG_SDI,
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+ .arginfo = QCOM_SCM_ARGS(2),
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+ .args[0] = 1 /* 1: disable watchdog debug */,
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+ .args[1] = 0 /* 0: disable SDI */,
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+ .owner = ARM_SMCCC_OWNER_SIP,
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+ };
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+
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+ return qcom_scm_call(__scm->dev, &desc, NULL);
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+}
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+
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static void qcom_scm_set_download_mode(bool enable)
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{
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bool avail;
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@@ -1256,6 +1270,13 @@ static int qcom_scm_probe(struct platfor
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if (download_mode)
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qcom_scm_set_download_mode(true);
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+ /*
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+ * Factory firmware leaves SDI (a debug interface), which prevents
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+ * clean reboot.
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+ */
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+ if (of_machine_is_compatible("google,wifi"))
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+ __qcom_scm_disable_sdi(__scm->dev);
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+
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return 0;
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}
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--- a/drivers/firmware/qcom_scm.h
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+++ b/drivers/firmware/qcom_scm.h
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@@ -77,6 +77,7 @@ extern int scm_legacy_call(struct device
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#define QCOM_SCM_SVC_BOOT 0x01
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#define QCOM_SCM_BOOT_SET_ADDR 0x01
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#define QCOM_SCM_BOOT_TERMINATE_PC 0x02
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+#define QCOM_SCM_BOOT_CONFIG_SDI 0x09
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#define QCOM_SCM_BOOT_SET_DLOAD_MODE 0x10
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#define QCOM_SCM_BOOT_SET_REMOTE_STATE 0x0a
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#define QCOM_SCM_FLUSH_FLAG_MASK 0x3
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