linux-kernel - [PATCH] drm/msm/gpu: Add proper DEVFREQ_GOV_SIMPLE

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Date:   Wed, 18 Jan 2023 16:58:05 +0100
From:   Arnd Bergmann <arnd@...nel.org>
To:     Rob Clark <robdclark@...il.com>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc:     Arnd Bergmann <arnd@...db.de>, Sean Paul <sean@...rly.run>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Stephen Boyd <swboyd@...omium.org>,
        Chia-I Wu <olvaffe@...il.com>, linux-arm-msm@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] drm/msm/gpu: Add proper DEVFREQ_GOV_SIMPLE_ONDEMAND dependency

From: Arnd Bergmann <arnd@...db.de>

DRM_MSM can no longer be built when devfreq is disabled:

WARNING: unmet direct dependencies detected for DEVFREQ_GOV_SIMPLE_ONDEMAND
  Depends on [n]: PM_DEVFREQ [=n]
  Selected by [y]:
  - DRM_MSM [=y] && HAS_IOMEM [=y] && DRM [=y] && (ARCH_QCOM [=n] || SOC_IMX5 [=n] || COMPILE_TEST [=y]) && COMMON_CLK [=y] && IOMMU_SUPPORT [=y] && (QCOM_OCMEM [=n] || QCOM_OCMEM [=n]=n) && (QCOM_LLCC [=n] || QCOM_LLCC [=n]=n) && (QCOM_COMMAND_DB [=y] || QCOM_COMMAND_DB [=y]=n)

In file included from drivers/gpu/drm/msm/msm_gpu.h:18,
                 from drivers/gpu/drm/msm/adreno/adreno_gpu.h:15,
                 from drivers/gpu/drm/msm/adreno/adreno_device.c:9:
drivers/gpu/drm/msm/msm_drv.h:238:45: error: field 'gpu_devfreq_config' has incomplete type
  238 |         struct devfreq_simple_ondemand_data gpu_devfreq_config;
      |                                             ^~~~~~~~~~~~~~~~~~

Device drivers should never select user-visible options, especially
in other subsystems. This one can simply be expressed as a Kconfig
'depends on' statement, though a better approach would be to
let the driver keep working even without devfreq.

Note that the same symbol selects a bunch of other drivers that
should probably be turned into 'depends on' as well, but doing so
has the potential to introduce regressions, so I'm not touching
that here.

Fixes: 6563f60f14cb ("drm/msm/gpu: Add devfreq tuning debugfs")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/gpu/drm/msm/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/msm/Kconfig b/drivers/gpu/drm/msm/Kconfig
index 871870ddf7ec..7f6f5202648a 100644
--- a/drivers/gpu/drm/msm/Kconfig
+++ b/drivers/gpu/drm/msm/Kconfig
@@ -9,6 +9,7 @@ config DRM_MSM
 	depends on QCOM_OCMEM || QCOM_OCMEM=n
 	depends on QCOM_LLCC || QCOM_LLCC=n
 	depends on QCOM_COMMAND_DB || QCOM_COMMAND_DB=n
+	depends on DEVFREQ_GOV_SIMPLE_ONDEMAND
 	select IOMMU_IO_PGTABLE
 	select QCOM_MDT_LOADER if ARCH_QCOM
 	select REGULATOR
@@ -23,7 +24,6 @@ config DRM_MSM
 	select SHMEM
 	select TMPFS
 	select QCOM_SCM
-	select DEVFREQ_GOV_SIMPLE_ONDEMAND
 	select WANT_DEV_COREDUMP
 	select SND_SOC_HDMI_CODEC if SND_SOC
 	select SYNC_FILE
-- 
2.39.0