drm/msm/adreno: warn if chip revn is verified before being set
The commit 010c8bba ("drm: msm: adreno: Disable preemption on Adreno 510") tried to check GPU's revn before revn being set. Add WARN_ON_ONCE to prevent such bugs from happening again. A separate helper is necessary so that the warning is displayed really just once instead of being displayed for each of comparisons. Suggested-by: Stephen Boyd <swboyd@chromium.org> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> Reviewed-by: Stephen Boyd <swboyd@chromium.org> Patchwork: https://patchwork.freedesktop.org/patch/531705/Signed-off-by: Rob Clark <robdclark@chromium.org>
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