msm: kgsl: Don't use 'wait_timeout' in the idle functions
There are two distinct parts of the code that may need to loop waiting
for the GPU to complete a task: waiting for a timestamp and waiting
for the entire core to go idle. Waiting for a timestamp technically
doesn't need a timeout since the only downside is a process that sleeps
forever with an interruptible timeout. Waiting for the core to go idle
is more problematic because it is a busy wait and it is the last point
we can safely detect a GPU hang.
Beacuse we can (and will) not use a timeout in wait for timestamp, we
need to institute a new timeout value to be used in idle. Nowhere the
idle function is called uses a custom value for the timeout, so remove
that parameter from the calls and use a static timeout value in the
core specific functions.
Change-Id: Ic0dedbad9ecd2044c34e4cec551dc7f53b253f3d
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>
diff --git a/drivers/gpu/msm/z180.h b/drivers/gpu/msm/z180.h
index 6e81a9d..a8973d2 100644
--- a/drivers/gpu/msm/z180.h
+++ b/drivers/gpu/msm/z180.h
@@ -28,6 +28,9 @@
#define Z180_DEFAULT_PWRSCALE_POLICY NULL
+/* Wait a maximum of 10 seconds when trying to idle the core */
+#define Z180_IDLE_TIMEOUT (10 * 1000)
+
struct z180_ringbuffer {
unsigned int prevctx;
struct kgsl_memdesc cmdbufdesc;