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@xxxxxxxxxxxxxxxx>
Signed-off-by: Philipp Zabel <p.zabel@xxxxxxxxxxxxxx>
---
Changes since v1 [1]:
- Merge with dba536cd9538 ("drm/etnaviv: add THERMAL dependency")
- Remove build warning, default y should be enough to avoid accidentally
enabling thermal support but not etnaviv thermal throttling.
[1] https://patchwork.kernel.org/patch/10087265/
---
drivers/gpu/drm/etnaviv/Kconfig | 10 ++++++++++
drivers/gpu/drm/etnaviv/etnaviv_gpu.c | 8 +++++---
2 files changed, 15 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/etnaviv/Kconfig b/drivers/gpu/drm/etnaviv/Kconfig
index a29b8f59eb15d..c446e867b3a24 100644
--- 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 WANT_DEV_COREDUMP
select CMA if HAVE_DMA_CONTIGUOUS
@@ -13,6 +14,15 @@ config DRM_ETNAVIV
help
DRM driver for Vivante GPUs.
+config DRM_ETNAVIV_THERMAL
+ bool "enable ETNAVIV thermal throttling"
+ depends on DRM_ETNAVIV
+ default y
+ select THERMAL
+ 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
diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gpu.c b/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
index e19cbe05da2a3..968cbc2be9c45 100644
--- a/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
+++ b/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
@@ -1738,7 +1738,7 @@ static int etnaviv_gpu_bind(struct device *dev, struct device *master,
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))
@@ -1751,7 +1751,8 @@ static int etnaviv_gpu_bind(struct device *dev, struct device *master,
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;
}
@@ -1808,7 +1809,8 @@ static void etnaviv_gpu_unbind(struct device *dev, struct device *master,
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;
}
--
2.11.0
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