ati-vga: Allow setting EDID parameters directly

The EDID generation has some parameters that can be set via properties
but since ati-vga uses i2c-ddc it is only accessible with -global
option. Expose these properties so users can more easily set it via
e.g. -device ati-vga,xres=1024,yres=768.

Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
Message-ID: <20260305233717.1D08F5969F6@zero.eik.bme.hu>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>

hw/display/ati.c

@@ -28,7 +28,6 @@
 #include "qemu/error-report.h"
 #include "qapi/error.h"
 #include "ui/console.h"
-#include "hw/display/i2c-ddc.h"
 #include "trace.h"
 
 #define ATI_DEBUG_HW_CURSOR 0
@@ -1039,6 +1038,7 @@ static void ati_vga_realize(PCIDevice *dev, Error **errp)
 {
     ATIVGAState *s = ATI_VGA(dev);
     VGACommonState *vga = &s->vga;
+    I2CBus *i2cbus;
     uint64_t aper_size;
 
 #ifndef CONFIG_PIXMAN
@@ -1087,11 +1087,10 @@ static void ati_vga_realize(PCIDevice *dev, Error **errp)
     }
 
     /* ddc, edid */
-    I2CBus *i2cbus = i2c_init_bus(DEVICE(s), "ati-vga.ddc");
+    i2cbus = i2c_init_bus(DEVICE(s), "ati-vga.ddc");
     bitbang_i2c_init(&s->bbi2c, i2cbus);
-    I2CSlave *i2cddc = I2C_SLAVE(qdev_new(TYPE_I2CDDC));
-    i2c_slave_set_address(i2cddc, 0x50);
-    qdev_realize_and_unref(DEVICE(i2cddc), BUS(i2cbus), &error_abort);
+    i2c_slave_set_address(I2C_SLAVE(&s->i2cddc), 0x50);
+    qdev_realize(DEVICE(&s->i2cddc), BUS(i2cbus), &error_abort);
 
     /* mmio register space */
     memory_region_init_io(&s->mm, OBJECT(s), &ati_mm_ops, s,
@@ -1147,6 +1146,7 @@ static const Property ati_vga_properties[] = {
     DEFINE_PROP_BOOL("guest_hwcursor", ATIVGAState, cursor_guest_mode, false),
     /* this is a debug option, prefer PROP_UINT over PROP_BIT for simplicity */
     DEFINE_PROP_UINT8("x-pixman", ATIVGAState, use_pixman, DEFAULT_X_PIXMAN),
+    DEFINE_EDID_PROPERTIES(ATIVGAState, i2cddc.edid_info),
 };
 
 static void ati_vga_class_init(ObjectClass *klass, const void *data)
@@ -1169,6 +1169,9 @@ static void ati_vga_class_init(ObjectClass *klass, const void *data)
 
 static void ati_vga_init(Object *o)
 {
+    ATIVGAState *s = ATI_VGA(o);
+
+    object_initialize_child(o, "edid", &s->i2cddc, TYPE_I2CDDC);
     object_property_set_description(o, "x-pixman", "Use pixman for: "
                                     "1: fill, 2: blit");
 }

hw/display/ati_int.h

@@ -13,6 +13,7 @@
 #include "qemu/units.h"
 #include "hw/pci/pci_device.h"
 #include "hw/i2c/bitbang_i2c.h"
+#include "hw/display/i2c-ddc.h"
 #include "vga_int.h"
 #include "qom/object.h"
 
@@ -108,6 +109,7 @@ struct ATIVGAState {
     QEMUCursor *cursor;
     QEMUTimer vblank_timer;
     bitbang_i2c_interface bbi2c;
+    I2CDDCState i2cddc;
     MemoryRegion linear_aper;
     MemoryRegion io;
     MemoryRegion mm;