MA-12335 Canonical Boot Reason in Android Pie 9.0

Read boot reason from SRC(system reset controller) and report
it to kernel by "androidboot.bootreason=<>" kernel commandline.
This is enabled on imx6/7/7ulp/8m, imx8 will report default value
"androidboot.bootreason=reboot" since it can't get such info on
A core at u-boot stage.

Test: Boot reason report ok on imx6qp/imx7ulp/imx8qxp.

Change-Id: I03effaa03bc513bec6153e82c1a04e29c07e7db8
Signed-off-by: Ji Luo <ji.luo@nxp.com>

arch/arm/mach-imx/cpu.c

@@ -43,7 +43,12 @@ static char *get_reset_cause(void)
 	struct src *src_regs = (struct src *)SRC_BASE_ADDR;
 
 	cause = readl(&src_regs->srsr);
+#ifndef CONFIG_ANDROID_BOOT_IMAGE
+	/* We will read the ssrs states later for android so we don't
+	 * clear the states here.
+	 */
 	writel(cause, &src_regs->srsr);
+#endif
 	reset_cause = cause;
 
 	switch (cause) {
@@ -87,6 +92,17 @@ static char *get_reset_cause(void)
 	}
 }
 
+#ifdef CONFIG_ANDROID_BOOT_IMAGE
+void get_reboot_reason(char *ret)
+{
+	struct src *src_regs = (struct src *)SRC_BASE_ADDR;
+
+	strcpy(ret, (char *)get_reset_cause());
+	/* clear the srsr here, its state has been recorded in reset_cause */
+	writel(reset_cause, &src_regs->srsr);
+}
+#endif
+
 u32 get_imx_reset_cause(void)
 {
 	return reset_cause;

arch/arm/mach-imx/mx7ulp/soc.c

@@ -252,7 +252,12 @@ static char *get_reset_cause(char *ret)
 
 	srs = readl(reg_srs);
 	cause1 = readl(reg_ssrs);
+#ifndef CONFIG_ANDROID_BOOT_IMAGE
+	/* We will read the ssrs states later for android so we don't
+	 * clear the states here.
+	 */
 	writel(cause1, reg_ssrs);
+#endif
 
 	reset_cause = cause1;
 
@@ -292,6 +297,17 @@ static char *get_reset_cause(char *ret)
 	return ret;
 }
 
+#ifdef CONFIG_ANDROID_BOOT_IMAGE
+void get_reboot_reason(char *ret)
+{
+	u32 *reg_ssrs = (u32 *)(SRC_BASE_ADDR + 0x28);
+
+	get_reset_cause(ret);
+	/* clear the ssrs here, its state has been recorded in reset_cause */
+	writel(reset_cause, reg_ssrs);
+}
+#endif
+
 void arch_preboot_os(void)
 {
 #if defined(CONFIG_VIDEO_MXS)

common/image-android.c

@@ -143,6 +143,23 @@ int android_image_get_kernel(const struct andr_img_hdr *hdr, int verify,
 		metrics.odt, metrics.sw);
 	strncat(commandline, newbootargs, sizeof(commandline) - strlen(commandline));
 
+#if defined(CONFIG_ARCH_MX6) || defined(CONFIG_ARCH_MX7) || \
+	defined(CONFIG_ARCH_MX7ULP) || defined(CONFIG_ARCH_IMX8M)
+	char cause[18];
+
+	memset(cause, '\0', sizeof(cause));
+	get_reboot_reason(cause);
+	if (strstr(cause, "POR"))
+		sprintf(newbootargs," androidboot.bootreason=cold,powerkey");
+	else if (strstr(cause, "WDOG") || strstr(cause, "WDG"))
+		sprintf(newbootargs," androidboot.bootreason=watchdog");
+	else
+		sprintf(newbootargs," androidboot.bootreason=reboot");
+#else
+	sprintf(newbootargs," androidboot.bootreason=reboot");
+#endif
+	strncat(commandline, newbootargs, sizeof(commandline) - strlen(commandline));
+
 #ifdef CONFIG_AVB_SUPPORT
 	/* secondary cmdline added by avb */
 	char *bootargs_sec = env_get("bootargs_sec");

include/common.h

@@ -164,6 +164,10 @@ int print_cpuinfo(void);
 int update_flash_size(int flash_size);
 int arch_early_init_r(void);
 
+#ifdef CONFIG_ANDROID_BOOT_IMAGE
+void get_reboot_reason(char *ret);
+#endif
+
 /*
  * setup_board_extra() - Fill in extra details in the bd_t structure
  *