On Tuesday 20 February 2018 03:59 PM, Thierry Reding wrote:
From: Thierry Reding <treding@xxxxxxxxxx>
DRM_DUMB_VGA_DAC is a user-visible symbol. Selecting it can cause unmet
direct dependencies such as this (on i386, randconfig):
warning: (DRM_PL111) selects DRM_DUMB_VGA_DAC which has unmet direct dependencies (HAS_IOMEM && DRM && DRM_BRIDGE && OF)
This is because DRM_DUMB_VGA_DAC depends on OF while DRM_PL111 does not.
It does indirectly depend on OF via the ARM and ARM64 dependencies, but
since it can also be enabled under COMPILE_TEST, randconfig can find a
case where DRM_PL111 is selected without pulling in OF and not meeting
the dependency for DRM_DUMB_VGA_DAC.
Since select is "heavy handed", DRM_DUMB_VGA_DAC is going to be enabled
regardless of the above warning and causes the following build error:
../drivers/gpu/drm/bridge/dumb-vga-dac.c: In function 'dumb_vga_probe':
../drivers/gpu/drm/bridge/dumb-vga-dac.c:207:13: error: 'struct drm_bridge' has no member named 'of_node'
vga->bridge.of_node = pdev->dev.of_node;
See Documentation/kbuild/kconfig-language.txt, "reverse dependencies".
+Linus.
I guess this needs to go in drm-misc-fixes once it is updated to
4.16-rc2.
Thanks,
Archit
Fixes: 49f81d80ab84 ("drm/pl111: Support handling bridge timings")
Reported-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
Cc: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
Cc: Archit Taneja <architt@xxxxxxxxxxxxxx>
Cc: Eric Anholt <eric@xxxxxxxxxx>
Signed-off-by: Thierry Reding <treding@xxxxxxxxxx>
---
drivers/gpu/drm/pl111/Kconfig | 1 -
1 file changed, 1 deletion(-)
diff --git a/drivers/gpu/drm/pl111/Kconfig b/drivers/gpu/drm/pl111/Kconfig
index 82cb3e60ddc8..e5e2abd66491 100644
--- a/drivers/gpu/drm/pl111/Kconfig
+++ b/drivers/gpu/drm/pl111/Kconfig
@@ -8,7 +8,6 @@ config DRM_PL111
select DRM_GEM_CMA_HELPER
select DRM_BRIDGE
select DRM_PANEL_BRIDGE
- select DRM_DUMB_VGA_DAC
select VT_HW_CONSOLE_BINDING if FRAMEBUFFER_CONSOLE
help
Choose this option for DRM support for the PL111 CLCD controller.
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