drm/xe: Increase TDF timeout

There are some corner cases where flushing transient
data may take slightly longer than the 150us timeout
we currently allow.  Update the driver to use a 300us
timeout instead based on the latest guidance from
the hardware team. An update to the bspec to formally
document this is expected to arrive soon.

Fixes: c01c606 ("drm/xe/device: implement transient flush")
Signed-off-by: Jagmeet Randhawa <jagmeet.randhawa@intel.com>
Reviewed-by: Jonathan Cavitt <jonathan.cavitt@intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Link: https://patch.msgid.link/0201b1d6ec64d3651fcbff1ea21026efa915126a.1765487866.git.jagmeet.randhawa@intel.com
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
(cherry picked from commit d69d363)
Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>

Author: Jagmeet-intel

drivers/gpu/drm/xe/xe_device.c

@@ -1056,7 +1056,7 @@ static void tdf_request_sync(struct xe_device *xe)
 		 * transient and need to be flushed..
 		 */
 		if (xe_mmio_wait32(&gt->mmio, XE2_TDF_CTRL, TRANSIENT_FLUSH_REQUEST, 0,
-				   150, NULL, false))
+				   300, NULL, false))
 			xe_gt_err_once(gt, "TD flush timeout\n");
 
 		xe_force_wake_put(gt_to_fw(gt), fw_ref);