2021-10-26 08:33:10

by Julian Braha

Subject: [PATCH v2] drm: bridge: fix unmet dependency on DRM_KMS_HELPER for DRM_PANEL_BRIDGE

When DRM_CHIPONE_ICN6211 is selected, and DRM_KMS_HELPER is not selected,
Kbuild gives the following warning:

WARNING: unmet direct dependencies detected for DRM_PANEL_BRIDGE
Depends on [n]: HAS_IOMEM [=y] && DRM_BRIDGE [=y] && DRM_KMS_HELPER [=n]
Selected by [y]:
- DRM_CHIPONE_ICN6211 [=y] && HAS_IOMEM [=y] && DRM [=y] && DRM_BRIDGE [=y] && OF [=y]

This is because DRM_CHIPONE_ICN6211 selects DRM_PANEL_BRIDGE
without depending on or selecting DRM_KMS_HELPER,
despite DRM_PANEL_BRIDGE depending on DRM_KMS_HELPER.

This unmet dependency bug was detected by Kismet,
a static analysis tool for Kconfig.
Please advise if this is not the appropriate solution.

v2:
- changed from "select" to "depends on"

Fixes: ce517f18944e ("drm: bridge: Add Chipone ICN6211 MIPI-DSI to RGB bridge")
Reviewed-by: Robert Foss <[email protected]>
Signed-off-by: Julian Braha <[email protected]>
---
drivers/gpu/drm/bridge/Kconfig | 1 +
1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
index 431b6e12a81f..a630cb8fd1c8 100644
--- a/drivers/gpu/drm/bridge/Kconfig
+++ b/drivers/gpu/drm/bridge/Kconfig
@@ -30,6 +30,7 @@ config DRM_CDNS_DSI
config DRM_CHIPONE_ICN6211
tristate "Chipone ICN6211 MIPI-DSI/RGB Converter bridge"
depends on OF
+ depends on DRM_KMS_HELPER
select DRM_MIPI_DSI
select DRM_PANEL_BRIDGE
help
--
2.30.2

2021-10-27 12:44:32

by Laurent Pinchart

Subject: Re: [PATCH v2] drm: bridge: fix unmet dependency on DRM_KMS_HELPER for DRM_PANEL_BRIDGE

Hi Julian,

Thank you for the patch.

On Mon, Oct 25, 2021 at 10:36:38PM -0400, Julian Braha wrote:
> When DRM_CHIPONE_ICN6211 is selected, and DRM_KMS_HELPER is not selected,
> Kbuild gives the following warning:
>
> WARNING: unmet direct dependencies detected for DRM_PANEL_BRIDGE
> Depends on [n]: HAS_IOMEM [=y] && DRM_BRIDGE [=y] && DRM_KMS_HELPER [=n]
> Selected by [y]:
> - DRM_CHIPONE_ICN6211 [=y] && HAS_IOMEM [=y] && DRM [=y] && DRM_BRIDGE [=y] && OF [=y]
>
> This is because DRM_CHIPONE_ICN6211 selects DRM_PANEL_BRIDGE
> without depending on or selecting DRM_KMS_HELPER,
> despite DRM_PANEL_BRIDGE depending on DRM_KMS_HELPER.
>
> This unmet dependency bug was detected by Kismet,
> a static analysis tool for Kconfig.
> Please advise if this is not the appropriate solution.
>
> v2:
> - changed from "select" to "depends on"
>
> Fixes: ce517f18944e ("drm: bridge: Add Chipone ICN6211 MIPI-DSI to RGB bridge")
> Reviewed-by: Robert Foss <[email protected]>
> Signed-off-by: Julian Braha <[email protected]>
> ---
> drivers/gpu/drm/bridge/Kconfig | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
> index 431b6e12a81f..a630cb8fd1c8 100644
> --- a/drivers/gpu/drm/bridge/Kconfig
> +++ b/drivers/gpu/drm/bridge/Kconfig
> @@ -30,6 +30,7 @@ config DRM_CDNS_DSI
> config DRM_CHIPONE_ICN6211
> tristate "Chipone ICN6211 MIPI-DSI/RGB Converter bridge"
> depends on OF
> + depends on DRM_KMS_HELPER

With spaces replaced by tabs for indentation,

Reviewed-by: Laurent Pinchart <[email protected]>

> select DRM_MIPI_DSI
> select DRM_PANEL_BRIDGE
> help

--
Regards,

Laurent Pinchart