linux-kernel - [PATCH] drm/panel: add CONFIG_DRM_KMS

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Date:   Wed, 16 Mar 2022 19:36:46 +0100
From:   Arnd Bergmann <arnd@...nel.org>
To:     Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Thierry Reding <thierry.reding@...il.com>
Cc:     Arnd Bergmann <arnd@...db.de>, Sam Ravnborg <sam@...nborg.org>,
        Alex Deucher <alexander.deucher@....com>,
        Kees Cook <keescook@...omium.org>,
        Lukas Bulwahn <lukas.bulwahn@...il.com>,
        Jani Nikula <jani.nikula@...el.com>,
        Deepak Rawat <drawat.floss@...il.com>,
        Javier Martinez Canillas <javierm@...hat.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Douglas Anderson <dianders@...omium.org>,
        Noralf Trønnes <noralf@...nnes.org>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...ainline.org>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Dillon Min <dillon.minfei@...il.com>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: [PATCH] drm/panel: add CONFIG_DRM_KMS_HELPER dependencies

From: Arnd Bergmann <arnd@...db.de>

The driver fails to build when the KMS helpers are disabled:

ld.lld: error: undefined symbol: drm_gem_fb_get_obj
>>> referenced by drm_mipi_dbi.c
>>>               gpu/drm/drm_mipi_dbi.o:(mipi_dbi_buf_copy) in archive drivers/built-in.a
>>> referenced by drm_mipi_dbi.c
>>>               gpu/drm/drm_mipi_dbi.o:(mipi_dbi_fb_dirty) in archive drivers/built-in.a

ld.lld: error: undefined symbol: drm_gem_fb_begin_cpu_access
>>> referenced by drm_mipi_dbi.c
>>>               gpu/drm/drm_mipi_dbi.o:(mipi_dbi_buf_copy) in archive drivers/built-in.a

ld.lld: error: undefined symbol: drm_fb_swab
>>> referenced by drm_mipi_dbi.c
>>>               gpu/drm/drm_mipi_dbi.o:(mipi_dbi_buf_copy) in archive drivers/built-in.a

ld.lld: error: undefined symbol: drm_fb_xrgb8888_to_rgb565
>>> referenced by drm_mipi_dbi.c
>>>               gpu/drm/drm_mipi_dbi.o:(mipi_dbi_buf_copy) in archive drivers/built-in.a

ld.lld: error: undefined symbol: drm_fb_memcpy
>>> referenced by drm_mipi_dbi.c
>>>               gpu/drm/drm_mipi_dbi.o:(mipi_dbi_buf_copy) in archive drivers/built-in.a

This is fairly hard to hit in randconfig drivers, but it eventually
did trigger for me in a configuration where all other DRM drivers
are loadable modules, but DRM_PANEL_WIDECHIPS_WS2401 was built-in.

Adding a dependency in all drivers that select DRM_MIPI_DBI avoids
the problem for now, adding the dependency in DRM_MIPI_DBI as well
should help make it easier to figure out why it breaks if someone
forgets the dependency the next time.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/gpu/drm/Kconfig       | 2 +-
 drivers/gpu/drm/panel/Kconfig | 4 ++++
 2 files changed, 5 insertions(+), 1 deletion(-)

I see this warning on 5.17-rc8, but did not test it on linux-next,
which may already have a fix.


diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
index b1f22e457fd0..d5ec0b77c010 100644
--- a/drivers/gpu/drm/Kconfig
+++ b/drivers/gpu/drm/Kconfig
@@ -30,7 +30,7 @@ menuconfig DRM
 
 config DRM_MIPI_DBI
 	tristate
-	depends on DRM
+	depends on DRM_KMS_HELPER
 
 config DRM_MIPI_DSI
 	bool
diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
index 0aec5a10b064..96887d0efb9f 100644
--- a/drivers/gpu/drm/panel/Kconfig
+++ b/drivers/gpu/drm/panel/Kconfig
@@ -425,6 +425,7 @@ config DRM_PANEL_SAMSUNG_DB7430
 	tristate "Samsung DB7430-based DPI panels"
 	depends on OF && SPI && GPIOLIB
 	depends on BACKLIGHT_CLASS_DEVICE
+	depends on DRM_KMS_HELPER
 	select DRM_MIPI_DBI
 	help
 	  Say Y here if you want to enable support for the Samsung
@@ -440,6 +441,7 @@ config DRM_PANEL_SAMSUNG_S6D16D0
 config DRM_PANEL_SAMSUNG_S6D27A1
 	tristate "Samsung S6D27A1 DPI panel driver"
 	depends on OF && SPI && GPIOLIB
+	depends on DRM_KMS_HELPER
 	select DRM_MIPI_DBI
 	help
 	  Say Y here if you want to enable support for the Samsung
@@ -476,6 +478,7 @@ config DRM_PANEL_SAMSUNG_S6E63M0_SPI
 	depends on SPI
 	depends on DRM_PANEL_SAMSUNG_S6E63M0
 	default DRM_PANEL_SAMSUNG_S6E63M0
+	depends on DRM_KMS_HELPER
 	select DRM_MIPI_DBI
 	help
 	  Say Y here if you want to be able to access the Samsung
@@ -677,6 +680,7 @@ config DRM_PANEL_WIDECHIPS_WS2401
 	tristate "Widechips WS2401 DPI panel driver"
 	depends on SPI && GPIOLIB
 	depends on BACKLIGHT_CLASS_DEVICE
+	depends on DRM_KMS_HELPER
 	select DRM_MIPI_DBI
 	help
 	  Say Y here if you want to enable support for the Widechips WS2401 DPI
-- 
2.29.2