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Subject[PATCH 4.14 059/109] drm/etnaviv: make THERMAL selectable
Date
4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Philipp Zabel <p.zabel@pengutronix.de>


[ 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.

Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/gpu/drm/etnaviv/Kconfig | 9 +++++++++
drivers/gpu/drm/etnaviv/etnaviv_gpu.c | 8 +++++---
2 files changed, 14 insertions(+), 3 deletions(-)

--- a/drivers/gpu/drm/etnaviv/Kconfig
+++ b/drivers/gpu/drm/etnaviv/Kconfig
@@ -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
--- a/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
+++ b/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
@@ -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;
}


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