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authorThomas Zimmermann <tzimmermann@suse.de>2019-11-26 11:15:29 +0100
committerThomas Zimmermann <tzimmermann@suse.de>2019-11-27 08:11:11 +0100
commit1591fadf857cdbaf2baa55e421af99a61354713c (patch)
tree28c54d387c0919f05f0e86c315ada6ff9af15924 /drivers/gpu/drm/mgag200
parentd6d437d97d54c85a1a93967b2745e31dff03365a (diff)
drm/mgag200: Add workaround for HW that does not support 'startadd'
There's at least one system that does not interpret the value of the device's 'startadd' field correctly, which leads to incorrectly displayed scanout buffers. Always placing the active scanout buffer at offset 0 works around the problem. Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Reported-by: John Donnelly <john.p.donnelly@oracle.com> Tested-by: John Donnelly <john.p.donnelly@oracle.com> Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch> Fixes: 81da87f63a1e ("drm: Replace drm_gem_vram_push_to_system() with kunmap + unpin") Cc: Gerd Hoffmann <kraxel@redhat.com> Cc: Dave Airlie <airlied@redhat.com> Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Cc: Maxime Ripard <mripard@kernel.org> Cc: David Airlie <airlied@linux.ie> Cc: Sam Ravnborg <sam@ravnborg.org> Cc: "Y.C. Chen" <yc_chen@aspeedtech.com> Cc: Neil Armstrong <narmstrong@baylibre.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: "José Roberto de Souza" <jose.souza@intel.com> Cc: Andrzej Pietrasiewicz <andrzej.p@collabora.com> Cc: dri-devel@lists.freedesktop.org Cc: <stable@vger.kernel.org> # v5.3+ Link: https://gitlab.freedesktop.org/drm/misc/issues/7 Link: https://patchwork.freedesktop.org/patch/msgid/20191126101529.20356-4-tzimmermann@suse.de
Diffstat (limited to 'drivers/gpu/drm/mgag200')
-rw-r--r--drivers/gpu/drm/mgag200/mgag200_drv.c36
-rw-r--r--drivers/gpu/drm/mgag200/mgag200_drv.h3
2 files changed, 38 insertions, 1 deletions
diff --git a/drivers/gpu/drm/mgag200/mgag200_drv.c b/drivers/gpu/drm/mgag200/mgag200_drv.c
index 397f8b0a9af8..d43951caeea0 100644
--- a/drivers/gpu/drm/mgag200/mgag200_drv.c
+++ b/drivers/gpu/drm/mgag200/mgag200_drv.c
@@ -30,6 +30,8 @@ module_param_named(modeset, mgag200_modeset, int, 0400);
static struct drm_driver driver;
static const struct pci_device_id pciidlist[] = {
+ { PCI_VENDOR_ID_MATROX, 0x522, PCI_VENDOR_ID_SUN, 0x4852, 0, 0,
+ G200_SE_A | MGAG200_FLAG_HW_BUG_NO_STARTADD},
{ PCI_VENDOR_ID_MATROX, 0x522, PCI_ANY_ID, PCI_ANY_ID, 0, 0, G200_SE_A },
{ PCI_VENDOR_ID_MATROX, 0x524, PCI_ANY_ID, PCI_ANY_ID, 0, 0, G200_SE_B },
{ PCI_VENDOR_ID_MATROX, 0x530, PCI_ANY_ID, PCI_ANY_ID, 0, 0, G200_EV },
@@ -60,6 +62,35 @@ static void mga_pci_remove(struct pci_dev *pdev)
DEFINE_DRM_GEM_FOPS(mgag200_driver_fops);
+static bool mgag200_pin_bo_at_0(const struct mga_device *mdev)
+{
+ return mdev->flags & MGAG200_FLAG_HW_BUG_NO_STARTADD;
+}
+
+int mgag200_driver_dumb_create(struct drm_file *file,
+ struct drm_device *dev,
+ struct drm_mode_create_dumb *args)
+{
+ struct mga_device *mdev = dev->dev_private;
+ unsigned long pg_align;
+
+ if (WARN_ONCE(!dev->vram_mm, "VRAM MM not initialized"))
+ return -EINVAL;
+
+ pg_align = 0ul;
+
+ /*
+ * Aligning scanout buffers to the size of the video ram forces
+ * placement at offset 0. Works around a bug where HW does not
+ * respect 'startadd' field.
+ */
+ if (mgag200_pin_bo_at_0(mdev))
+ pg_align = PFN_UP(mdev->mc.vram_size);
+
+ return drm_gem_vram_fill_create_dumb(file, dev, &dev->vram_mm->bdev,
+ pg_align, false, args);
+}
+
static struct drm_driver driver = {
.driver_features = DRIVER_GEM | DRIVER_MODESET,
.load = mgag200_driver_load,
@@ -71,7 +102,10 @@ static struct drm_driver driver = {
.major = DRIVER_MAJOR,
.minor = DRIVER_MINOR,
.patchlevel = DRIVER_PATCHLEVEL,
- DRM_GEM_VRAM_DRIVER
+ .debugfs_init = drm_vram_mm_debugfs_init,
+ .dumb_create = mgag200_driver_dumb_create,
+ .dumb_map_offset = drm_gem_vram_driver_dumb_mmap_offset,
+ .gem_prime_mmap = drm_gem_prime_mmap,
};
static struct pci_driver mgag200_pci_driver = {
diff --git a/drivers/gpu/drm/mgag200/mgag200_drv.h b/drivers/gpu/drm/mgag200/mgag200_drv.h
index 4b4f9ce74a84..aa32aad222c2 100644
--- a/drivers/gpu/drm/mgag200/mgag200_drv.h
+++ b/drivers/gpu/drm/mgag200/mgag200_drv.h
@@ -150,6 +150,9 @@ enum mga_type {
G200_EW3,
};
+/* HW does not handle 'startadd' field correct. */
+#define MGAG200_FLAG_HW_BUG_NO_STARTADD (1ul << 8)
+
#define MGAG200_TYPE_MASK (0x000000ff)
#define MGAG200_FLAG_MASK (0x00ffff00)