[PATCH 1/1] efi_loader: initialize console size late

[Heinrich Schuchardt]

From: Heinrich Schuchardt <xypron.glpk at gmx.de>

If CONFIG_VIDEO_DM=n we query the display size from the serial console.
Especially when using a remote console the response can be so late that
it interferes with autoboot.

Only query the console size when running an EFI binary.

Add debug output showing the determined console size.

Reported-by: Fabio Estevam <festevam at gmail.com>
Fixes: a9bf024b2933 ("efi_loader: disk: a helper function to create efi_disk objects from udevice")
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt at canonical.com>
---
 include/efi_loader.h         |  2 ++
 lib/efi_loader/efi_console.c | 20 +++++++++++++-------
 lib/efi_loader/efi_setup.c   |  4 ++++
 3 files changed, 19 insertions(+), 7 deletions(-)

diff --git a/include/efi_loader.h b/include/efi_loader.h
index f6651e2c60..c1e00ebac3 100644
--- a/include/efi_loader.h
+++ b/include/efi_loader.h
@@ -499,6 +499,8 @@ extern struct list_head efi_register_notify_events;
 int efi_init_early(void);
 /* Initialize efi execution environment */
 efi_status_t efi_init_obj_list(void);
+/* Set up console modes */
+void efi_setup_console_size(void);
 /* Install device tree */
 efi_status_t efi_install_fdt(void *fdt);
 /* Run loaded UEFI image */
diff --git a/lib/efi_loader/efi_console.c b/lib/efi_loader/efi_console.c
index 60a3fc85ac..3164fd484e 100644
--- a/lib/efi_loader/efi_console.c
+++ b/lib/efi_loader/efi_console.c
@@ -5,6 +5,8 @@
  *  Copyright (c) 2016 Alexander Graf
  */
 
+#define LOG_CATEGORY LOGC_EFI
+
 #include <common.h>
 #include <charset.h>
 #include <malloc.h>
@@ -12,6 +14,7 @@
 #include <dm/device.h>
 #include <efi_loader.h>
 #include <env.h>
+#include <log.h>
 #include <stdio_dev.h>
 #include <video_console.h>
 #include <linux/delay.h>
@@ -58,7 +61,12 @@ const efi_guid_t efi_guid_text_output_protocol =
 #define cESC '\x1b'
 #define ESC "\x1b"
 
-/* Default to mode 0 */
+/*
+ * efi_con_mode - mode information of the Simple Text Output Protocol
+ *
+ * Use safe settings before efi_setup_console_size() is called.
+ * By default enable only the 80x25 mode which must always exist.
+ */
 static struct simple_text_output_mode efi_con_mode = {
 	.max_mode = 1,
 	.mode = 0,
@@ -333,13 +341,13 @@ static int __maybe_unused query_vidconsole(int *rows, int *cols)
 }
 
 /**
- * query_console_size() - update the mode table.
+ * efi_setup_console_size() - update the mode table.
  *
  * By default the only mode available is 80x25. If the console has at least 50
  * lines, enable mode 80x50. If we can query the console size and it is neither
  * 80x25 nor 80x50, set it as an additional mode.
  */
-static void query_console_size(void)
+void efi_setup_console_size(void)
 {
 	int rows = 25, cols = 80;
 	int ret = -ENODEV;
@@ -351,6 +359,8 @@ static void query_console_size(void)
 	if (ret)
 		return;
 
+	log_debug("Console size %dx%d\n", rows, cols);
+
 	/* Test if we can have Mode 1 */
 	if (cols >= 80 && rows >= 50) {
 		efi_cout_modes[1].present = 1;
@@ -371,7 +381,6 @@ static void query_console_size(void)
 	}
 }
 
-
 /**
  * efi_cout_query_mode() - get terminal size for a text mode
  *
@@ -1262,9 +1271,6 @@ efi_status_t efi_console_register(void)
 	efi_status_t r;
 	struct efi_device_path *dp;
 
-	/* Set up mode information */
-	query_console_size();
-
 	/* Install protocols on root node */
 	r = EFI_CALL(efi_install_multiple_protocol_interfaces
 		     (&efi_root,
diff --git a/lib/efi_loader/efi_setup.c b/lib/efi_loader/efi_setup.c
index 250eeb2fcd..492ecf4cb1 100644
--- a/lib/efi_loader/efi_setup.c
+++ b/lib/efi_loader/efi_setup.c
@@ -243,6 +243,10 @@ efi_status_t efi_init_obj_list(void)
 			goto out;
 	}
 
+	/* Set up console modes */
+	efi_setup_console_size();
+
+	/* Install EFI_RNG_PROTOCOL */
 	if (IS_ENABLED(CONFIG_EFI_RNG_PROTOCOL)) {
 		ret = efi_rng_register();
 		if (ret != EFI_SUCCESS)
-- 
2.36.1