From: Chris Wilson <chris@chris-wilson.co.uk>
Date: Wed, 15 Nov 2017 10:50:35 +0000
Subject: drm/i915/: Initialise trans_min for skl_compute_transition_wm()
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Git-commit: be3fa66857051e2943960a06f8046e8445cdfe6e
Patch-mainline: v4.17-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

clang spots

drivers/gpu/drm/i915/intel_pm.c:4655:6: warning: variable 'trans_min' is used uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized]
        if (INTEL_GEN(dev_priv) >= 10)

but fortunately for us we skip the function unless on a gen10+ device.
However, to keep the function generic in case we do want to re-enable it
for gen9 again, initialise trans_min to 0.

References: ca47667f523e ("drm/i915/gen10: Calculate and enable transition WM")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mahesh Kumar <mahesh1.kumar@intel.com>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171115105036.1094-3-chris@chris-wilson.co.uk
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/gpu/drm/i915/intel_pm.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -4713,6 +4713,7 @@ static void skl_compute_transition_wm(st
 	if (!dev_priv->ipc_enabled)
 		goto exit;
 
+	trans_min = 0;
 	if (INTEL_GEN(dev_priv) >= 10)
 		trans_min = 4;