[PATCH 6/9] vmwgfx: Pick up the initial size from the width and height regs

[Thomas Hellstrom <thellstrom@vmware.com>]

From: Jakob Bornecrantz <jakob@vmware.com>

Signed-off-by: Jakob Bornecrantz <jakob@vmware.com>
Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
---
 drivers/gpu/drm/vmwgfx/vmwgfx_drv.c  |   32 ++++++++++++++++++++++++++++++++
 drivers/gpu/drm/vmwgfx/vmwgfx_drv.h  |    2 ++
 drivers/gpu/drm/vmwgfx/vmwgfx_fb.c   |    8 ++------
 drivers/gpu/drm/vmwgfx/vmwgfx_ldu.c  |    4 ++--
 drivers/gpu/drm/vmwgfx/vmwgfx_scrn.c |    4 ++--
 5 files changed, 40 insertions(+), 10 deletions(-)

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
index 28f59a3c3..1227232 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
@@ -38,6 +38,10 @@
 #define VMWGFX_CHIP_SVGAII 0
 #define VMW_FB_RESERVATION 0
 
+#define VMW_MIN_INITIAL_WIDTH 800
+#define VMW_MIN_INITIAL_HEIGHT 600
+
+
 /**
  * Fully encoded drm commands. Might move to vmw_drm.h
  */
@@ -387,6 +391,31 @@ void vmw_3d_resource_dec(struct vmw_private *dev_priv,
 	BUG_ON(n3d < 0);
 }
 
+/**
+ * Sets the initial_[width|height] fields on the given vmw_private.
+ *
+ * It does so by reading SVGA_REG_[WIDTH|HEIGHT] regs and then
+ * capping the value to fb_max_[width|height] fields and the
+ * VMW_MIN_INITIAL_[WIDTH|HEIGHT].
+ */
+static void vmw_get_initial_size(struct vmw_private *dev_priv)
+{
+	uint32_t width;
+	uint32_t height;
+
+	width = vmw_read(dev_priv, SVGA_REG_WIDTH);
+	height = vmw_read(dev_priv, SVGA_REG_HEIGHT);
+
+	width = max_t(uint32_t, width, VMW_MIN_INITIAL_WIDTH);
+	width = min_t(uint32_t, width, dev_priv->fb_max_width);
+
+	height = max_t(uint32_t, height, VMW_MIN_INITIAL_HEIGHT);
+	height = min_t(uint32_t, height, dev_priv->fb_max_height);
+
+	dev_priv->initial_width = width;
+	dev_priv->initial_height = height;
+}
+
 static int vmw_driver_load(struct drm_device *dev, unsigned long chipset)
 {
 	struct vmw_private *dev_priv;
@@ -441,6 +470,9 @@ static int vmw_driver_load(struct drm_device *dev, unsigned long chipset)
 	dev_priv->mmio_size = vmw_read(dev_priv, SVGA_REG_MEM_SIZE);
 	dev_priv->fb_max_width = vmw_read(dev_priv, SVGA_REG_MAX_WIDTH);
 	dev_priv->fb_max_height = vmw_read(dev_priv, SVGA_REG_MAX_HEIGHT);
+
+	vmw_get_initial_size(dev_priv);
+
 	if (dev_priv->capabilities & SVGA_CAP_GMR) {
 		dev_priv->max_gmr_descriptors =
 			vmw_read(dev_priv,
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.h b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.h
index 14c2f49..2866415 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.h
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.h
@@ -203,6 +203,8 @@ struct vmw_private {
 	uint32_t mmio_size;
 	uint32_t fb_max_width;
 	uint32_t fb_max_height;
+	uint32_t initial_width;
+	uint32_t initial_height;
 	__le32 __iomem *mmio_virt;
 	int mmio_mtrr;
 	uint32_t capabilities;
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_fb.c b/drivers/gpu/drm/vmwgfx/vmwgfx_fb.c
index 34e51a1..39931c4 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_fb.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_fb.c
@@ -414,10 +414,6 @@ int vmw_fb_init(struct vmw_private *vmw_priv)
 	unsigned fb_bpp, fb_depth, fb_offset, fb_pitch, fb_size;
 	int ret;
 
-	/* XXX These shouldn't be hardcoded. */
-	initial_width = 800;
-	initial_height = 600;
-
 	fb_bpp = 32;
 	fb_depth = 24;
 
@@ -425,8 +421,8 @@ int vmw_fb_init(struct vmw_private *vmw_priv)
 	fb_width = min(vmw_priv->fb_max_width, (unsigned)2048);
 	fb_height = min(vmw_priv->fb_max_height, (unsigned)2048);
 
-	initial_width = min(fb_width, initial_width);
-	initial_height = min(fb_height, initial_height);
+	initial_width = min(vmw_priv->initial_width, fb_width);
+	initial_height = min(vmw_priv->initial_height, fb_height);
 
 	fb_pitch = fb_width * fb_bpp / 8;
 	fb_size = fb_pitch * fb_height;
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_ldu.c b/drivers/gpu/drm/vmwgfx/vmwgfx_ldu.c
index f77b184..070fb23 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_ldu.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_ldu.c
@@ -354,8 +354,8 @@ static int vmw_ldu_init(struct vmw_private *dev_priv, unsigned unit)
 	INIT_LIST_HEAD(&ldu->active);
 
 	ldu->base.pref_active = (unit == 0);
-	ldu->base.pref_width = 800;
-	ldu->base.pref_height = 600;
+	ldu->base.pref_width = dev_priv->initial_width;
+	ldu->base.pref_height = dev_priv->initial_height;
 	ldu->base.pref_mode = NULL;
 	ldu->base.is_implicit = true;
 
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_scrn.c b/drivers/gpu/drm/vmwgfx/vmwgfx_scrn.c
index 97aca0b..6deaf2f 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_scrn.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_scrn.c
@@ -449,8 +449,8 @@ static int vmw_sou_init(struct vmw_private *dev_priv, unsigned unit)
 	sou->active_implicit = false;
 
 	sou->base.pref_active = (unit == 0);
-	sou->base.pref_width = 800;
-	sou->base.pref_height = 600;
+	sou->base.pref_width = dev_priv->initial_width;
+	sou->base.pref_height = dev_priv->initial_height;
 	sou->base.pref_mode = NULL;
 	sou->base.is_implicit = true;
 
-- 
1.7.4.4