linux-kernel - [PATCH v5 01/15] drm/msm/adreno: adreno_gpu: Don't set OPP scaling clock w/ GMU

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Message-Id: <20230223-topic-gmuwrapper-v5-1-bf774b9a902a@linaro.org>
Date:   Fri, 31 Mar 2023 01:25:15 +0200
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Rob Clark <robdclark@...il.com>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Sean Paul <sean@...rly.run>, David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Akhil P Oommen <quic_akhilpo@...cinc.com>
Cc:     linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, Rob Clark <robdclark@...omium.org>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>
Subject: [PATCH v5 01/15] 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: 9f251f934012 ("drm/msm/adreno: Use OPP for every GPU generation")
Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
---
 drivers/gpu/drm/msm/adreno/adreno_gpu.c | 24 ++++++++++++++----------
 1 file changed, 14 insertions(+), 10 deletions(-)

diff --git a/drivers/gpu/drm/msm/adreno/adreno_gpu.c b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
index d12f2f314022..84f25122afba 100644
--- a/drivers/gpu/drm/msm/adreno/adreno_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
@@ -1021,18 +1021,22 @@ 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);

-- 
2.40.0