Hi Arnd.
On Wed, May 27, 2020 at 03:31:42PM +0200, Arnd Bergmann wrote:
> The vexpress_config code fails to link in some configurations:
>
> drivers/gpu/drm/pl111/pl111_versatile.o: in function `pl111_versatile_init':
> (.text+0x1f0): undefined reference to `devm_regmap_init_vexpress_config'
>
> Add a dependency that links to this only if the dependency is there,
> and prevent the configuration where the drm driver is built-in but
> the config is a loadable module.
>
> Fixes: 826fc86b5903 ("drm: pl111: Move VExpress setup into versatile init")
> Signed-off-by: Arnd Bergmann <a...@arndb.de>
Could this be another way to fix it:
diff --git a/drivers/gpu/drm/pl111/pl111_versatile.c
b/drivers/gpu/drm/pl111/pl111_versatile.c
index 64f01a4e6767..1c38d3bd2e84 100644
--- a/drivers/gpu/drm/pl111/pl111_versatile.c
+++ b/drivers/gpu/drm/pl111/pl111_versatile.c
@@ -379,7 +379,7 @@ static int pl111_vexpress_clcd_init(struct device *dev,
struct device_node *np,
u32 val;
int ret;
- if (!IS_ENABLED(CONFIG_VEXPRESS_CONFIG))
+ if (!IS_REACHABLE(CONFIG_VEXPRESS_CONFIG))
return -ENODEV;
/*
Then we no longer have the whole driver depending on
the value of VEXPRESS_CONFIG.
Not that I like IS_REACHABLE() but we already had
IS_ENABLED() to cover up here, and that was not enough.
With your patch would we then need the IS_ENABLED()
check?
Sam
> ---
> drivers/gpu/drm/pl111/Kconfig | 1 +
> drivers/gpu/drm/pl111/pl111_versatile.c | 3 ++-
> 2 files changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/pl111/Kconfig b/drivers/gpu/drm/pl111/Kconfig
> index 80f6748055e3..33a005816fdd 100644
> --- a/drivers/gpu/drm/pl111/Kconfig
> +++ b/drivers/gpu/drm/pl111/Kconfig
> @@ -3,6 +3,7 @@ config DRM_PL111
> tristate "DRM Support for PL111 CLCD Controller"
> depends on DRM
> depends on ARM || ARM64 || COMPILE_TEST
> + depends on VEXPRESS_CONFIG || !VEXPRESS_CONFIG
> depends on COMMON_CLK
> select DRM_KMS_HELPER
> select DRM_KMS_CMA_HELPER
> diff --git a/drivers/gpu/drm/pl111/pl111_versatile.c
> b/drivers/gpu/drm/pl111/pl111_versatile.c
> index 64f01a4e6767..451d74205108 100644
> --- a/drivers/gpu/drm/pl111/pl111_versatile.c
> +++ b/drivers/gpu/drm/pl111/pl111_versatile.c
> @@ -476,7 +476,8 @@ int pl111_versatile_init(struct device *dev, struct
> pl111_drm_dev_private *priv)
> versatile_clcd_type = (enum versatile_clcd)clcd_id->data;
>
> /* Versatile Express special handling */
> - if (versatile_clcd_type == VEXPRESS_CLCD_V2M) {
> + if (IS_ENABLED(CONFIG_VEXPRESS_CONFIG) &&
> + versatile_clcd_type == VEXPRESS_CLCD_V2M) {
> int ret = pl111_vexpress_clcd_init(dev, np, priv);
> of_node_put(np);
> if (ret)
> --
> 2.26.2
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