ddr: marvell: a38x: debug: Allow compiling with immutable debug settings to reduce binary size

Allow compiling with immutable debug settings:
- DEBUG_LEVEL is always set to DEBUG_LEVEL_ERROR
- register dumps are disabled

This can save around 10 KiB of space in the resulting binary, which is a
lot in U-Boot SPL.

Signed-off-by: Marek Behún <kabel@kernel.org>

arch/arm/mach-mvebu/Kconfig

@@ -250,6 +250,16 @@ config DDR_LOG_LEVEL
 	  At level 3, rovides the windows margin of each DQ as a results of
 	  DQS centeralization.
 
+config DDR_IMMUTABLE_DEBUG_SETTINGS
+	bool "Immutable DDR debug level (always DEBUG_LEVEL_ERROR)"
+	depends on ARMADA_38X
+	help
+	  Makes the DDR training code debug level settings immutable.
+	  The debug level setting from board topology definition is ignored.
+	  The debug level is always set to DEBUG_LEVEL_ERROR and register
+	  dumps are disabled.
+	  This can save around 10 KiB of space in SPL binary.
+
 config DDR_RESET_ON_TRAINING_FAILURE
 	bool "Reset the board on DDR training failure instead of hanging"
 	depends on ARMADA_38X || ARMADA_XP

drivers/ddr/marvell/a38x/ddr3_debug.c

@@ -7,18 +7,21 @@
 #include "mv_ddr_training_db.h"
 #include "mv_ddr_regs.h"
 
+#if !defined(CONFIG_DDR_IMMUTABLE_DEBUG_SETTINGS)
 u8 is_reg_dump = 0;
 u8 debug_pbs = DEBUG_LEVEL_ERROR;
+#endif
 
 /*
  * API to change flags outside of the lib
  */
-#if defined(SILENT_LIB)
+#if defined(SILENT_LIB) || defined(CONFIG_DDR_IMMUTABLE_DEBUG_SETTINGS)
 void ddr3_hws_set_log_level(enum ddr_lib_debug_block block, u8 level)
 {
 	/* do nothing */
 }
-#else /* SILENT_LIB */
+#else /* !SILENT_LIB && !CONFIG_DDR_IMMUTABLE_DEBUG_SETTINGS */
+
 /* Debug flags for other Training modules */
 u8 debug_training_static = DEBUG_LEVEL_ERROR;
 u8 debug_training = DEBUG_LEVEL_ERROR;
@@ -104,7 +107,7 @@ void ddr3_hws_set_log_level(enum ddr_lib_debug_block block, u8 level)
 #endif /* CONFIG_DDR4 */
 	}
 }
-#endif /* SILENT_LIB */
+#endif /* !SILENT_LIB && !CONFIG_DDR_IMMUTABLE_DEBUG_SETTINGS */
 
 #if defined(DDR_VIEWER_TOOL)
 static char *convert_freq(enum mv_ddr_freq freq);

drivers/ddr/marvell/a38x/ddr3_init.c

@@ -41,7 +41,8 @@ int ddr3_init(void)
 	mv_ddr_pre_training_soc_config(ddr_type);
 
 	/* Set log level for training library */
-	mv_ddr_user_log_level_set(DEBUG_BLOCK_ALL);
+	if (!IS_ENABLED(CONFIG_DDR_IMMUTABLE_DEBUG_SETTINGS))
+		mv_ddr_user_log_level_set(DEBUG_BLOCK_ALL);
 
 	mv_ddr_early_init();
 

drivers/ddr/marvell/a38x/ddr3_init.h

@@ -45,15 +45,46 @@ enum log_level  {
 #define MISL_PHY_ODT_N_OFFS	0x0
 
 /* Globals */
-extern u8 debug_training, debug_calibration, debug_ddr4_centralization,
+#if defined(CONFIG_DDR_IMMUTABLE_DEBUG_SETTINGS)
-	debug_tap_tuning, debug_dm_tuning;
+static const u8 is_reg_dump = 0;
+static const u8 debug_training_static = DEBUG_LEVEL_ERROR;
+static const u8 debug_training = DEBUG_LEVEL_ERROR;
+static const u8 debug_leveling = DEBUG_LEVEL_ERROR;
+static const u8 debug_centralization = DEBUG_LEVEL_ERROR;
+static const u8 debug_training_ip = DEBUG_LEVEL_ERROR;
+static const u8 debug_training_bist = DEBUG_LEVEL_ERROR;
+static const u8 debug_training_hw_alg = DEBUG_LEVEL_ERROR;
+static const u8 debug_training_access = DEBUG_LEVEL_ERROR;
+static const u8 debug_training_device = DEBUG_LEVEL_ERROR;
+static const u8 debug_pbs = DEBUG_LEVEL_ERROR;
+
+static const u8 debug_tap_tuning = DEBUG_LEVEL_ERROR;
+static const u8 debug_calibration = DEBUG_LEVEL_ERROR;
+static const u8 debug_ddr4_centralization = DEBUG_LEVEL_ERROR;
+static const u8 debug_dm_tuning = DEBUG_LEVEL_ERROR;
+#else /* !CONFIG_DDR_IMMUTABLE_DEBUG_SETTINGS */
 extern u8 is_reg_dump;
+extern u8 debug_training_static;
+extern u8 debug_training;
+extern u8 debug_leveling;
+extern u8 debug_centralization;
+extern u8 debug_training_ip;
+extern u8 debug_training_bist;
+extern u8 debug_training_hw_alg;
+extern u8 debug_training_access;
+extern u8 debug_training_device;
+extern u8 debug_pbs;
+
+extern u8 debug_tap_tuning;
+extern u8 debug_calibration;
+extern u8 debug_ddr4_centralization;
+extern u8 debug_dm_tuning;
+#endif /* !CONFIG_DDR_IMMUTABLE_DEBUG_SETTINGS */
+
 extern u8 generic_init_controller;
 /* list of allowed frequency listed in order of enum mv_ddr_freq */
 extern u32 is_pll_old;
 extern struct pattern_info pattern_table[];
-extern u8 debug_centralization, debug_training_ip, debug_training_bist,
-	debug_pbs, debug_training_static, debug_leveling;
 extern struct hws_tip_config_func_db config_func_info[];
 extern u8 twr_mask_table[];
 extern u8 cl_mask_table[];
@@ -76,7 +107,6 @@ extern u32 g_rtt_nom;
 extern u32 g_rtt_wr;
 extern u32 g_rtt_park;
 
-extern u8 debug_training_access;
 extern u32 first_active_if;
 extern u32 delay_enable, ck_delay, ca_delay;
 extern u32 mask_tune_func;
@@ -122,8 +152,6 @@ extern u32 effective_cs;
 extern int ddr3_tip_centr_skip_min_win_check;
 extern u32 *dq_map_table;
 
-extern u8 debug_training_hw_alg;
-
 extern u32 start_xsb_offset;
 extern u32 odt_config;