This patch makes the necessary additions to deliver syncpoint base
to the user space.
This patch splits the index field in the drm_tegra_get_syncpt structure
into three separate fields (index, support_base, base_id). This allows
to keep compatibility over kernel versions:
- The placing of index field stays constant and therefore the interface
should stay compatible with earlier userspace versions.
- The old index field was input-only and it was not supposed to be read
afterwards. Delivering data back in the same field should not introduce
regressions to any old user space applications.
- Old kernels left support_base and base_id fields intact (zero) and
hence the new user space applications get the correct response from
the kernel (=syncpoint does not have a base).
Signed-off-by: Arto Merilainen <amerilainen@xxxxxxxxxx>
---
drivers/gpu/host1x/drm/drm.c | 2 ++
include/uapi/drm/tegra_drm.h | 4 +++-
2 files changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/host1x/drm/drm.c b/drivers/gpu/host1x/drm/drm.c
index 8c61cee..4251563 100644
--- a/drivers/gpu/host1x/drm/drm.c
+++ b/drivers/gpu/host1x/drm/drm.c
@@ -468,6 +468,8 @@ static int tegra_get_syncpt(struct drm_device *drm, void *data,
syncpt = context->client->syncpts[args->index];
args->id = host1x_syncpt_id(syncpt);
+ args->support_base = syncpt->base ? 1 : 0;
+ args->base_id = syncpt->base ? syncpt->base->id : 0;
return 0;
}
diff --git a/include/uapi/drm/tegra_drm.h b/include/uapi/drm/tegra_drm.h
index 73bde4e..7a79ca5 100644
--- a/include/uapi/drm/tegra_drm.h
+++ b/include/uapi/drm/tegra_drm.h
@@ -61,7 +61,9 @@ struct drm_tegra_close_channel {
struct drm_tegra_get_syncpt {
__u64 context;
- __u32 index;
+ __u16 index;
+ __u8 support_base;
+ __u8 base_id;
__u32 id;
};
--
1.8.1.5
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