drm/msm/adreno: adreno_gpu: Don't set OPP scaling clock w/ GMU

Recently I contributed the switch to OPP API for all Adreno generations.
I did however also skip over the fact that GPUs with a GMU don't specify
a core clock of any kind in the GPU node. While that didn't break
anything, it did introduce unwanted spam in the dmesg:

adreno 5000000.gpu: error -ENOENT: _opp_set_clknames: Couldn't find clock with name: core_clk

Guard the entire logic so that it's not used with GMU-equipped GPUs.

Fixes: 9f251f93 ("drm/msm/adreno: Use OPP for every GPU generation")
Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/530347/
Link: https://lore.kernel.org/r/20230223-topic-gmuwrapper-v6-1-2034115bb60c@linaro.orgSigned-off-by: Rob Clark <robdclark@chromium.org>

drivers/gpu/drm/msm/adreno/adreno_gpu.c

@@ -1074,18 +1074,22 @@ int adreno_gpu_init(struct drm_device *drm, struct platform_device *pdev,
 	u32 speedbin;
 	int ret;
 
-	/*
-	 * This can only be done before devm_pm_opp_of_add_table(), or
-	 * dev_pm_opp_set_config() will WARN_ON()
-	 */
-	if (IS_ERR(devm_clk_get(dev, "core"))) {
+	/* Only handle the core clock when GMU is not in use */
+	if (config->rev.core < 6) {
 		/*
-		 * If "core" is absent, go for the legacy clock name.
-		 * If we got this far in probing, it's a given one of them exists.
+		 * This can only be done before devm_pm_opp_of_add_table(), or
+		 * dev_pm_opp_set_config() will WARN_ON()
 		 */
-		devm_pm_opp_set_clkname(dev, "core_clk");
-	} else
-		devm_pm_opp_set_clkname(dev, "core");
+		if (IS_ERR(devm_clk_get(dev, "core"))) {
+			/*
+			 * If "core" is absent, go for the legacy clock name.
+			 * If we got this far in probing, it's a given one of
+			 * them exists.
+			 */
+			devm_pm_opp_set_clkname(dev, "core_clk");
+		} else
+			devm_pm_opp_set_clkname(dev, "core");
+	}
 
 	adreno_gpu->funcs = funcs;
 	adreno_gpu->info = adreno_info(config->rev);