intel_extreme: implement get_preferred_mode for vbt on mobile

this avoids searching in edid information in this case.

Change-Id: I330341f089f71cd5de657a6630b5414d02db771f
Reviewed-on: https://review.haiku-os.org/c/haiku/+/4749
Reviewed-by: Jérôme Duval <[email protected]>

src/add-ons/accelerants/intel_extreme/accelerant_protos.h

@@ -33,6 +33,7 @@ uint32 intel_accelerant_mode_count(void);
 status_t intel_get_mode_list(display_mode* dm);
 status_t intel_propose_display_mode(display_mode* target,
 	const display_mode* low, const display_mode* high);
+status_t intel_get_preferred_mode(display_mode* preferredMode);
 status_t intel_set_display_mode(display_mode* mode);
 status_t intel_get_display_mode(display_mode* currentMode);
 status_t intel_get_edid_info(void* info, size_t size, uint32* _version);

src/add-ons/accelerants/intel_extreme/hooks.cpp

@@ -38,6 +38,8 @@ get_accelerant_hook(uint32 feature, void* data)
 			return (void*)intel_get_mode_list;
 		case B_PROPOSE_DISPLAY_MODE:
 			return (void*)intel_propose_display_mode;
+		case B_GET_PREFERRED_DISPLAY_MODE:
+			return (void*)intel_get_preferred_mode;
 		case B_SET_DISPLAY_MODE:
 			return (void*)intel_set_display_mode;
 		case B_GET_DISPLAY_MODE:

src/add-ons/accelerants/intel_extreme/mode.cpp

@@ -526,6 +526,29 @@ intel_get_display_mode(display_mode* _currentMode)
 }
 
 
+status_t
+intel_get_preferred_mode(display_mode* preferredMode)
+{
+	TRACE("%s\n", __func__);
+	display_mode mode;
+
+	if (gInfo->has_edid || !gInfo->shared_info->got_vbt
+			|| !gInfo->shared_info->device_type.IsMobile()) {
+		return B_ERROR;
+	}
+
+	mode.timing = gInfo->shared_info->panel_timing;
+	mode.space = B_RGB32;
+	mode.virtual_width = mode.timing.h_display;
+	mode.virtual_height = mode.timing.v_display;
+	mode.h_display_start = 0;
+	mode.v_display_start = 0;
+	mode.flags = 0;
+	memcpy(preferredMode, &mode, sizeof(mode));
+	return B_OK;
+}
+
+
 status_t
 intel_get_edid_info(void* info, size_t size, uint32* _version)
 {