drm/i915/: Initialise trans_min for skl_compute_transition_wm()

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 <[email protected]>
Cc: Mahesh Kumar <[email protected]>
Cc: Maarten Lankhorst <[email protected]>
Cc: Jani Nikula <[email protected]>
Cc: Joonas Lahtinen <[email protected]>
Cc: Rodrigo Vivi <[email protected]>
Cc: Ville Syrjälä <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
Reviewed-by: Rodrigo Vivi <[email protected]>

diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 158d00fdf5494175b7c146c9a1380566277c47b7..a88f0f2136042ae523636d660b83045a594cd19a 100644 (file)
--- 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(struct intel_crtc_state *cstate,
        if (!dev_priv->ipc_enabled)
                goto exit;
 
+       trans_min = 0;
        if (INTEL_GEN(dev_priv) >= 10)
                trans_min = 4;