ec/lenovo/h8: Reintroduce h8_mb_init() for specific boards

Mainboard specific dock-init mechanism introduced
https://review.coreboot.org/c/coreboot/+/36093 works on most boards,
but https://ticket.coreboot.org/issues/256 shows that some boards
(e.g. x201 and t410) need communication with h8 EC to enable or
disable dock, (in dock_connect() and dock_disconnect() respectively)
so they must be done after the h8 EC is brought up, which is not
garanteed in the above mainboard specific dock-init mechanism.

This time, a hook function h8_mb_init() will be called at the end of
h8_enable(). (in place of the ancient h8_mainboard_init_dock() removed
in CB:36093) Its default implementation is a weak empty function, but
could be overrided with a strong one for boards needing to perform
actions which should be done after h8 EC is brought up.

This should fix the regression detected in
https://ticket.coreboot.org/issues/256

Change-Id: I3674fbfeab2ea2cd2a4453a8e77521157d553388
Signed-off-by: Bill XIE <persmule@hardenedlinux.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/39708
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Rudolph <siro@das-labor.org>

src/ec/lenovo/h8/h8.c

@@ -221,6 +221,8 @@ struct device_operations h8_dev_ops = {
 	.init = h8_init,
 };
 
+void __weak h8_mb_init(void){ /* NOOP */ }
+
 static void h8_enable(struct device *dev)
 {
 	struct ec_lenovo_h8_config *conf = dev->chip_info;
@@ -340,6 +342,7 @@ static void h8_enable(struct device *dev)
 	h8_charge_priority(val);
 
 	h8_set_audio_mute(0);
+	h8_mb_init();
 }
 
 struct chip_operations ec_lenovo_h8_ops = {

src/ec/lenovo/h8/h8.h

@@ -35,6 +35,11 @@ bool h8_wwan_nv_enable(void);
 bool h8_has_wwan(const struct device *dev);
 
 void h8_ssdt_generator(const struct device *dev);
+/*
+ * boards needing specific h8-related inits could override it
+ */
+void h8_mb_init(void);
+
 
 /* EC registers */
 #define H8_CONFIG0 0x00

src/mainboard/lenovo/t410/dock.c

@@ -7,13 +7,14 @@
 #include <ec/lenovo/h8/h8.h>
 #include <ec/acpi/ec.h>
 
-void init_dock(void)
+void h8_mb_init(void)
 {
 	if (dock_present()) {
 		printk(BIOS_DEBUG, "dock is connected\n");
 		dock_connect();
-	} else
+	} else {
 		printk(BIOS_DEBUG, "dock is not connected\n");
+	}
 }
 
 void dock_connect(void)

src/mainboard/lenovo/t410/mainboard.c

@@ -10,7 +10,6 @@ static void mainboard_enable(struct device *dev)
 	install_intel_vga_int15_handler(GMA_INT15_ACTIVE_LFP_INT_LVDS,
 					GMA_INT15_PANEL_FIT_DEFAULT,
 					GMA_INT15_BOOT_DISPLAY_LFP, 2);
-	init_dock();
 }
 
 struct chip_operations mainboard_ops = {

src/mainboard/lenovo/x201/dock.c

@@ -7,13 +7,14 @@
 #include <ec/lenovo/h8/h8.h>
 #include <ec/acpi/ec.h>
 
-void init_dock(void)
+void h8_mb_init(void)
 {
 	if (dock_present()) {
 		printk(BIOS_DEBUG, "dock is connected\n");
 		dock_connect();
-	} else
+	} else {
 		printk(BIOS_DEBUG, "dock is not connected\n");
+	}
 }
 
 void dock_connect(void)

src/mainboard/lenovo/x201/mainboard.c

@@ -25,8 +25,6 @@ static void mainboard_enable(struct device *dev)
 	install_intel_vga_int15_handler(GMA_INT15_ACTIVE_LFP_INT_LVDS,
 					GMA_INT15_PANEL_FIT_DEFAULT,
 					GMA_INT15_BOOT_DISPLAY_LFP, 2);
-
-	init_dock();
 }
 
 struct chip_operations mainboard_ops = {