950-0268-firmware-raspberrypi-Report-the-fw-variant-during-pr.patch

From dfd66230d2d538e7f290436d2952124d6eadeb3d Mon Sep 17 00:00:00 2001
From: Dave Stevenson <dave.stevenson@raspberrypi.org>
Date: Thu, 10 Jan 2019 17:58:06 +0000
Subject: [PATCH] firmware: raspberrypi: Report the fw variant during
 probe

The driver already reported the firmware build date during probe.
The mailbox calls have been extended to also report the variant
 1 = standard start.elf
 2 = start_x.elf (includes camera stack)
 3 = start_db.elf (includes assert logging)
 4 = start_cd.elf (cutdown version for smallest memory footprint).
Log the variant during probe.

Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.org>
---
 drivers/firmware/raspberrypi.c             | 32 +++++++++++++++++-----
 include/soc/bcm2835/raspberrypi-firmware.h |  1 +
 2 files changed, 26 insertions(+), 7 deletions(-)

--- a/drivers/firmware/raspberrypi.c
+++ b/drivers/firmware/raspberrypi.c
@@ -227,21 +227,39 @@ static const struct attribute_group rpi_
 static void
 rpi_firmware_print_firmware_revision(struct rpi_firmware *fw)
 {
+	static const char * const variant_strs[] = {
+		"unknown",
+		"start",
+		"start_x",
+		"start_db",
+		"start_cd",
+	};
+	const char *variant_str = "cmd unsupported";
 	u32 packet;
+	u32 variant;
+	struct tm tm;
 	int ret = rpi_firmware_property(fw,
 					RPI_FIRMWARE_GET_FIRMWARE_REVISION,
 					&packet, sizeof(packet));
 
-	if (ret == 0) {
-		struct tm tm;
+	if (ret)
+		return;
 
-		time64_to_tm(packet, 0, &tm);
+	ret = rpi_firmware_property(fw, RPI_FIRMWARE_GET_FIRMWARE_VARIANT,
+				    &variant, sizeof(variant));
 
-		dev_info(fw->cl.dev,
-			 "Attached to firmware from %04ld-%02d-%02d %02d:%02d\n",
-			 tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
-			 tm.tm_hour, tm.tm_min);
+	if (!ret) {
+		if (variant >= ARRAY_SIZE(variant_strs))
+			variant = 0;
+		variant_str = variant_strs[variant];
 	}
+
+	time64_to_tm(packet, 0, &tm);
+
+	dev_info(fw->cl.dev,
+		 "Attached to firmware from %04ld-%02d-%02d %02d:%02d, variant %s\n",
+		 tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, tm.tm_hour,
+		 tm.tm_min, variant_str);
 }
 
 static void
--- a/include/soc/bcm2835/raspberrypi-firmware.h
+++ b/include/soc/bcm2835/raspberrypi-firmware.h
@@ -41,6 +41,7 @@ struct rpi_firmware_property_tag_header
 enum rpi_firmware_property_tag {
 	RPI_FIRMWARE_PROPERTY_END =                           0,
 	RPI_FIRMWARE_GET_FIRMWARE_REVISION =                  0x00000001,
+	RPI_FIRMWARE_GET_FIRMWARE_VARIANT =                   0x00000002,
 
 	RPI_FIRMWARE_SET_CURSOR_INFO =                        0x00008010,
 	RPI_FIRMWARE_SET_CURSOR_STATE =                       0x00008011,