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Subject[PATCH V3 1/5] drm/vkms: Avoid assigning 0 for possible_crtc
When vkms invoke drm_universal_plane_init(), it sets 0 for
possible_crtcs parameter which means that planes can't be attached to
any CRTC. It currently works due to some safeguard in the drm_crtc file;
however, it is possible to identify the problem by trying to append a
second connector. This patch fixes this issue by modifying
vkms_plane_init() to accept an index parameter which makes the code a
little bit more flexible and avoid set zero to possible_crtcs.

Signed-off-by: Rodrigo Siqueira <rodrigosiqueiramelo@gmail.com>
---
drivers/gpu/drm/vkms/vkms_drv.c | 2 +-
drivers/gpu/drm/vkms/vkms_drv.h | 4 ++--
drivers/gpu/drm/vkms/vkms_output.c | 6 +++---
drivers/gpu/drm/vkms/vkms_plane.c | 4 ++--
4 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/vkms/vkms_drv.c b/drivers/gpu/drm/vkms/vkms_drv.c
index cc53ef88a331..966b3d653189 100644
--- a/drivers/gpu/drm/vkms/vkms_drv.c
+++ b/drivers/gpu/drm/vkms/vkms_drv.c
@@ -127,7 +127,7 @@ static int vkms_modeset_init(struct vkms_device *vkmsdev)
dev->mode_config.preferred_depth = 24;
dev->mode_config.helper_private = &vkms_mode_config_helpers;

- return vkms_output_init(vkmsdev);
+ return vkms_output_init(vkmsdev, 0);
}

static int __init vkms_init(void)
diff --git a/drivers/gpu/drm/vkms/vkms_drv.h b/drivers/gpu/drm/vkms/vkms_drv.h
index 12b4db7ac641..e2d1aa089dec 100644
--- a/drivers/gpu/drm/vkms/vkms_drv.h
+++ b/drivers/gpu/drm/vkms/vkms_drv.h
@@ -115,10 +115,10 @@ bool vkms_get_vblank_timestamp(struct drm_device *dev, unsigned int pipe,
int *max_error, ktime_t *vblank_time,
bool in_vblank_irq);

-int vkms_output_init(struct vkms_device *vkmsdev);
+int vkms_output_init(struct vkms_device *vkmsdev, int index);

struct drm_plane *vkms_plane_init(struct vkms_device *vkmsdev,
- enum drm_plane_type type);
+ enum drm_plane_type type, int index);

/* Gem stuff */
struct drm_gem_object *vkms_gem_create(struct drm_device *dev,
diff --git a/drivers/gpu/drm/vkms/vkms_output.c b/drivers/gpu/drm/vkms/vkms_output.c
index 56fb5c2a2315..fb1941a6522c 100644
--- a/drivers/gpu/drm/vkms/vkms_output.c
+++ b/drivers/gpu/drm/vkms/vkms_output.c
@@ -35,7 +35,7 @@ static const struct drm_connector_helper_funcs vkms_conn_helper_funcs = {
.get_modes = vkms_conn_get_modes,
};

-int vkms_output_init(struct vkms_device *vkmsdev)
+int vkms_output_init(struct vkms_device *vkmsdev, int index)
{
struct vkms_output *output = &vkmsdev->output;
struct drm_device *dev = &vkmsdev->drm;
@@ -45,12 +45,12 @@ int vkms_output_init(struct vkms_device *vkmsdev)
struct drm_plane *primary, *cursor = NULL;
int ret;

- primary = vkms_plane_init(vkmsdev, DRM_PLANE_TYPE_PRIMARY);
+ primary = vkms_plane_init(vkmsdev, DRM_PLANE_TYPE_PRIMARY, index);
if (IS_ERR(primary))
return PTR_ERR(primary);

if (enable_cursor) {
- cursor = vkms_plane_init(vkmsdev, DRM_PLANE_TYPE_CURSOR);
+ cursor = vkms_plane_init(vkmsdev, DRM_PLANE_TYPE_CURSOR, index);
if (IS_ERR(cursor)) {
ret = PTR_ERR(cursor);
goto err_cursor;
diff --git a/drivers/gpu/drm/vkms/vkms_plane.c b/drivers/gpu/drm/vkms/vkms_plane.c
index 0fceb6258422..18c630cfc485 100644
--- a/drivers/gpu/drm/vkms/vkms_plane.c
+++ b/drivers/gpu/drm/vkms/vkms_plane.c
@@ -176,7 +176,7 @@ static const struct drm_plane_helper_funcs vkms_primary_helper_funcs = {
};

struct drm_plane *vkms_plane_init(struct vkms_device *vkmsdev,
- enum drm_plane_type type)
+ enum drm_plane_type type, int index)
{
struct drm_device *dev = &vkmsdev->drm;
const struct drm_plane_helper_funcs *funcs;
@@ -198,7 +198,7 @@ struct drm_plane *vkms_plane_init(struct vkms_device *vkmsdev,
funcs = &vkms_primary_helper_funcs;
}

- ret = drm_universal_plane_init(dev, plane, 0,
+ ret = drm_universal_plane_init(dev, plane, 1 << index,
&vkms_plane_funcs,
formats, nformats,
NULL, type, NULL);
--
2.21.0
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