Patch "drm/etnaviv: make THERMAL selectable" has been added to the 4.14-stable tree

This is a note to let you know that I've just added the patch titled

drm/etnaviv: make THERMAL selectable

to the 4.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
drm-etnaviv-make-thermal-selectable.patch
and it can be found in the queue-4.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Philipp Zabel <[email protected]>
Date: Fri, 1 Dec 2017 16:00:41 +0100
Subject: drm/etnaviv: make THERMAL selectable

From: Philipp Zabel <[email protected]>

[ Upstream commit 49b82c389d2a40eaef1355aaa35868b367aec9d1 ]

The etnaviv driver causes a link failure if it is built-in but THERMAL is built as a module:

drivers/gpu/drm/etnaviv/etnaviv_gpu.o: In function `etnaviv_gpu_bind':
etnaviv_gpu.c:(.text+0x4c4): undefined reference to thermal_of_cooling_device_register' etnaviv_gpu.c:(.text+0x600): undefined reference to thermal_cooling_device_unregister' drivers/gpu/drm/etnaviv/etnaviv_gpu.o: In function `etnaviv_gpu_unbind':
etnaviv_gpu.c:(.text+0x2aac): undefined reference to `thermal_cooling_device_unregister'

Adding a Kconfig dependency on THERMAL || !THERMAL to avoid this causes a dependency loop on x86_64:

drivers/gpu/drm/tve200/Kconfig:1:error: recursive dependency detected! For a resolution refer to Documentation/kbuild/kconfig-language.txt subsection "Kconfig recursive dependency limitations"
drivers/gpu/drm/tve200/Kconfig:1: symbol DRM_TVE200 depends on CMA
For a resolution refer to Documentation/kbuild/kconfig-language.txt subsection "Kconfig recursive dependency limitations" mm/Kconfig:489: symbol CMA is selected by DRM_ETNAVIV
For a resolution refer to Documentation/kbuild/kconfig-language.txt subsection "Kconfig recursive dependency limitations"
drivers/gpu/drm/etnaviv/Kconfig:2: symbol DRM_ETNAVIV depends on THERMAL
For a resolution refer to Documentation/kbuild/kconfig-language.txt subsection "Kconfig recursive dependency limitations"
drivers/thermal/Kconfig:5: symbol THERMAL is selected by ACPI_VIDEO
For a resolution refer to Documentation/kbuild/kconfig-language.txt subsection "Kconfig recursive dependency limitations"
drivers/acpi/Kconfig:189: symbol ACPI_VIDEO is selected by BACKLIGHT_CLASS_DEVICE
For a resolution refer to Documentation/kbuild/kconfig-language.txt subsection "Kconfig recursive dependency limitations"
drivers/video/backlight/Kconfig:158: symbol BACKLIGHT_CLASS_DEVICE is selected by DRM_PARADE_PS8622
For a resolution refer to Documentation/kbuild/kconfig-language.txt subsection "Kconfig recursive dependency limitations"
drivers/gpu/drm/bridge/Kconfig:62: symbol DRM_PARADE_PS8622 depends on DRM_BRIDGE
For a resolution refer to Documentation/kbuild/kconfig-language.txt subsection "Kconfig recursive dependency limitations"
drivers/gpu/drm/bridge/Kconfig:1: symbol DRM_BRIDGE is selected by DRM_TVE200

To work around this, add a new option DRM_ETNAVIV_THERMAL to optionally enable thermal throttling support and make DRM_ETNAVIV select THERMAL at the same time.

---
 drivers/gpu/drm/etnaviv/Kconfig       |    9 +++++++++
 drivers/gpu/drm/etnaviv/etnaviv_gpu.c |    8 +++++---
 2 files changed, 14 insertions(+), 3 deletions(-)

@@ -6,6 +6,7 @@ config DRM_ETNAVIV
 	depends on MMU
 	select SHMEM
 	select SYNC_FILE
+	select THERMAL if DRM_ETNAVIV_THERMAL
 	select TMPFS
 	select IOMMU_API
 	select IOMMU_SUPPORT

@@ -15,6 +16,14 @@ config DRM_ETNAVIV
 	help
 	  DRM driver for Vivante GPUs.
 
+config DRM_ETNAVIV_THERMAL
+	bool "enable ETNAVIV thermal throttling"
+	depends on DRM_ETNAVIV
+	default y
+	help
+	  Compile in support for thermal throttling.
+	  Say Y unless you want to risk burning your SoC.
+
 config DRM_ETNAVIV_REGISTER_LOGGING
 	bool "enable ETNAVIV register logging"
 	depends on DRM_ETNAVIV

@@ -1622,7 +1622,7 @@ static int etnaviv_gpu_bind(struct devic
 	struct etnaviv_gpu *gpu = dev_get_drvdata(dev);
 	int ret;
 
-	if (IS_ENABLED(CONFIG_THERMAL)) {
+	if (IS_ENABLED(CONFIG_DRM_ETNAVIV_THERMAL)) {
 		gpu->cooling = thermal_of_cooling_device_register(dev->of_node,
 				(char *)dev_name(dev), gpu, &cooling_ops);
 		if (IS_ERR(gpu->cooling))

@@ -1635,7 +1635,8 @@ static int etnaviv_gpu_bind(struct devic
 	ret = etnaviv_gpu_clk_enable(gpu);
 #endif
 	if (ret < 0) {
-		thermal_cooling_device_unregister(gpu->cooling);
+		if (IS_ENABLED(CONFIG_DRM_ETNAVIV_THERMAL))
+			thermal_cooling_device_unregister(gpu->cooling);
 		return ret;
 	}
 

@@ -1692,7 +1693,8 @@ static void etnaviv_gpu_unbind(struct de
 
 	gpu->drm = NULL;
 
-	thermal_cooling_device_unregister(gpu->cooling);
+	if (IS_ENABLED(CONFIG_DRM_ETNAVIV_THERMAL))
+		thermal_cooling_device_unregister(gpu->cooling);
 	gpu->cooling = NULL;
 }
 

Patches currently in stable-queue which might be from [email protected] are

queue-4.14/drm-edid-set-eld-connector-type-in-drm_edid_to_eld.patch queue-4.14/drm-etnaviv-make-thermal-selectable.patch