On 9/9/2019 6:51 PM, Sharma, Shashank wrote:
On 9/7/2019 4:37 PM, Animesh Manna wrote:
The lifetime of command buffer can be controlled by the dsb user
throuh refcount. Added refcount mechanism is dsb get/put call
which create/destroy dsb context.
Cc: Jani Nikula <jani.nikula@xxxxxxxxx>
Cc: Shashank Sharma <shashank.sharma@xxxxxxxxx>
Signed-off-by: Animesh Manna <animesh.manna@xxxxxxxxx>
---
drivers/gpu/drm/i915/display/intel_dsb.c | 22 ++++++++++++++++------
drivers/gpu/drm/i915/display/intel_dsb.h | 1 +
2 files changed, 17 insertions(+), 6 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/intel_dsb.c
b/drivers/gpu/drm/i915/display/intel_dsb.c
index 853685751540..b951a6b5264a 100644
--- a/drivers/gpu/drm/i915/display/intel_dsb.c
+++ b/drivers/gpu/drm/i915/display/intel_dsb.c
@@ -78,7 +78,12 @@ intel_dsb_get(struct intel_crtc *crtc)
struct intel_dsb *dsb = &crtc->dsb;
intel_wakeref_t wakeref;
- if ((!HAS_DSB(i915)) || dsb->cmd_buf)
+ if (!HAS_DSB(i915))
+ return dsb;
+
+ atomic_inc(&dsb->refcount);
+
As discussed we are not solving any problem with reference counting,
rather, we are adding a complexity here. It may be useful, when we are
extending single instance of DSB to DSB pool but not right now.
I would say we drop this patch all together, and just have the simple
implementation now.
Tried to have synchronization in single thread multiple user scenario
through ref-count mechanism, but can be taken in phased approach in future.
Regards,
Animesh
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