hw/display/bcm2835_fb: Reset resolution, etc correctly

The bcm2835_fb's initial resolution and other parameters are set
via QOM properties. We should reset to those initial values on
device reset, which means we need to save the QOM property
values somewhere that they are not overwritten by guest
changes to the framebuffer configuration.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20180814144436.679-5-peter.maydell@linaro.org

diff --git a/hw/display/bcm2835_fb.c b/hw/display/bcm2835_fb.c
index 9faabf0d0b4f4a4bb68efad9dc57a81fba8130c0..d95686c74c8eefedeabd895abb8b453ee5325f3b 100644 (file)
--- a/hw/display/bcm2835_fb.c
+++ b/hw/display/bcm2835_fb.c
@@ -329,11 +329,7 @@ static void bcm2835_fb_reset(DeviceState *dev)
 
     s->pending = false;
 
-    s->config.xres_virtual = s->config.xres;
-    s->config.yres_virtual = s->config.yres;
-    s->config.xoffset = 0;
-    s->config.yoffset = 0;
-    s->config.base = s->vcram_base + BCM2835_FB_OFFSET;
+    s->config = s->initial_config;
 
     s->invalidate = true;
     s->lock = false;
@@ -357,6 +353,13 @@ static void bcm2835_fb_realize(DeviceState *dev, Error **errp)
         return;
     }
 
+    /* Fill in the parts of initial_config that are not set by QOM properties */
+    s->initial_config.xres_virtual = s->initial_config.xres;
+    s->initial_config.yres_virtual = s->initial_config.yres;
+    s->initial_config.xoffset = 0;
+    s->initial_config.yoffset = 0;
+    s->initial_config.base = s->vcram_base + BCM2835_FB_OFFSET;
+
     s->dma_mr = MEMORY_REGION(obj);
     address_space_init(&s->dma_as, s->dma_mr, NULL);
 
@@ -370,13 +373,13 @@ static Property bcm2835_fb_props[] = {
     DEFINE_PROP_UINT32("vcram-base", BCM2835FBState, vcram_base, 0),/*required*/
     DEFINE_PROP_UINT32("vcram-size", BCM2835FBState, vcram_size,
                        DEFAULT_VCRAM_SIZE),
-    DEFINE_PROP_UINT32("xres", BCM2835FBState, config.xres, 640),
-    DEFINE_PROP_UINT32("yres", BCM2835FBState, config.yres, 480),
-    DEFINE_PROP_UINT32("bpp", BCM2835FBState, config.bpp, 16),
-    DEFINE_PROP_UINT32("pixo",
-                       BCM2835FBState, config.pixo, 1), /* 1=RGB, 0=BGR */
-    DEFINE_PROP_UINT32("alpha",
-                       BCM2835FBState, config.alpha, 2), /* alpha ignored */
+    DEFINE_PROP_UINT32("xres", BCM2835FBState, initial_config.xres, 640),
+    DEFINE_PROP_UINT32("yres", BCM2835FBState, initial_config.yres, 480),
+    DEFINE_PROP_UINT32("bpp", BCM2835FBState, initial_config.bpp, 16),
+    DEFINE_PROP_UINT32("pixo", BCM2835FBState,
+                       initial_config.pixo, 1), /* 1=RGB, 0=BGR */
+    DEFINE_PROP_UINT32("alpha", BCM2835FBState,
+                       initial_config.alpha, 2), /* alpha ignored */
     DEFINE_PROP_END_OF_LIST()
 };
 

diff --git a/include/hw/display/bcm2835_fb.h b/include/hw/display/bcm2835_fb.h
index 69cbf2d1fd97e6f9e409b5ec5f3e7351c945eada..374de54612198b45abcb273ae2e22e54d59897f3 100644 (file)
--- a/include/hw/display/bcm2835_fb.h
+++ b/include/hw/display/bcm2835_fb.h
@@ -47,6 +47,7 @@ typedef struct {
     bool lock, invalidate, pending;
 
     BCM2835FBConfig config;
+    BCM2835FBConfig initial_config;
 } BCM2835FBState;
 
 void bcm2835_fb_reconfigure(BCM2835FBState *s, BCM2835FBConfig *newconfig);