drm: Switch DRM_DISPLAY_DP_HELPER to depends on

Most of our helpers have relied on being selected so far through
Kconfig, but that creates issues when we have multiple layers of helpers
with some depending on others.

Indeed, select doesn't select a dependency's dependencies, and thus
isn't super intuitive. Depends on however doesn't have that limitation,
so we can just switch all the drivers that were selecting
DRM_DISPLAY_DP_HELPER to depend on it.
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Link: https://lore.kernel.org/r/20240327-kms-kconfig-helpers-v3-10-eafee11b84b3@kernel.orgSigned-off-by: Maxime Ripard <mripard@kernel.org>

drivers/gpu/drm/Kconfig

@@ -74,11 +74,11 @@ config DRM_KUNIT_TEST_HELPERS
 config DRM_KUNIT_TEST
 	tristate "KUnit tests for DRM" if !KUNIT_ALL_TESTS
 	depends on DRM
+	depends on DRM_DISPLAY_DP_HELPER
 	depends on DRM_DISPLAY_HELPER
 	depends on KUNIT
 	depends on MMU
 	select DRM_BUDDY
-	select DRM_DISPLAY_DP_HELPER
 	select DRM_EXEC
 	select DRM_EXPORT_FOR_TESTS if m
 	select DRM_GEM_SHMEM_HELPER

drivers/gpu/drm/amd/amdgpu/Kconfig

@@ -3,12 +3,12 @@
 config DRM_AMDGPU
 	tristate "AMD GPU"
 	depends on DRM
+	depends on DRM_DISPLAY_DP_HELPER
 	depends on DRM_DISPLAY_HELPER
 	depends on MMU
 	depends on PCI
 	depends on !UML
 	select FW_LOADER
-	select DRM_DISPLAY_DP_HELPER
 	select DRM_DISPLAY_HDMI_HELPER
 	select DRM_DISPLAY_HDCP_HELPER
 	select DRM_KMS_HELPER

drivers/gpu/drm/bridge/Kconfig

@@ -93,9 +93,9 @@ config DRM_FSL_LDB
 config DRM_ITE_IT6505
 	tristate "ITE IT6505 DisplayPort bridge"
 	depends on DRM_DISPLAY_DP_AUX_BUS
+	depends on DRM_DISPLAY_DP_HELPER
 	depends on DRM_DISPLAY_HELPER
 	depends on OF
-	select DRM_DISPLAY_DP_HELPER
 	select DRM_DISPLAY_HDCP_HELPER
 	select DRM_KMS_HELPER
 	select DRM_DP_HELPER
@@ -227,9 +227,9 @@ config DRM_PARADE_PS8622
 config DRM_PARADE_PS8640
 	tristate "Parade PS8640 MIPI DSI to eDP Converter"
 	depends on DRM_DISPLAY_DP_AUX_BUS
+	depends on DRM_DISPLAY_DP_HELPER
 	depends on DRM_DISPLAY_HELPER
 	depends on OF
-	select DRM_DISPLAY_DP_HELPER
 	select DRM_KMS_HELPER
 	select DRM_MIPI_DSI
 	select DRM_PANEL
@@ -313,9 +313,9 @@ config DRM_TOSHIBA_TC358764
 
 config DRM_TOSHIBA_TC358767
 	tristate "Toshiba TC358767 eDP bridge"
+	depends on DRM_DISPLAY_DP_HELPER
 	depends on DRM_DISPLAY_HELPER
 	depends on OF
-	select DRM_DISPLAY_DP_HELPER
 	select DRM_KMS_HELPER
 	select REGMAP_I2C
 	select DRM_MIPI_DSI
@@ -336,9 +336,9 @@ config DRM_TOSHIBA_TC358768
 
 config DRM_TOSHIBA_TC358775
 	tristate "Toshiba TC358775 DSI/LVDS bridge"
+	depends on DRM_DISPLAY_DP_HELPER
 	depends on DRM_DISPLAY_HELPER
 	depends on OF
-	select DRM_DISPLAY_DP_HELPER
 	select DRM_KMS_HELPER
 	select REGMAP_I2C
 	select DRM_PANEL
@@ -382,9 +382,9 @@ config DRM_TI_SN65DSI83
 config DRM_TI_SN65DSI86
 	tristate "TI SN65DSI86 DSI to eDP bridge"
 	depends on DRM_DISPLAY_DP_AUX_BUS
+	depends on DRM_DISPLAY_DP_HELPER
 	depends on DRM_DISPLAY_HELPER
 	depends on OF
-	select DRM_DISPLAY_DP_HELPER
 	select DRM_KMS_HELPER
 	select REGMAP_I2C
 	select DRM_PANEL

drivers/gpu/drm/bridge/analogix/Kconfig

 # SPDX-License-Identifier: GPL-2.0-only
 config DRM_ANALOGIX_ANX6345
 	tristate "Analogix ANX6345 bridge"
+	depends on DRM_DISPLAY_DP_HELPER
 	depends on DRM_DISPLAY_HELPER
 	depends on OF
 	select DRM_ANALOGIX_DP
-	select DRM_DISPLAY_DP_HELPER
 	select DRM_KMS_HELPER
 	select REGMAP_I2C
 	help
@@ -15,9 +15,9 @@ config DRM_ANALOGIX_ANX6345
 
 config DRM_ANALOGIX_ANX78XX
 	tristate "Analogix ANX78XX bridge"
+	depends on DRM_DISPLAY_DP_HELPER
 	depends on DRM_DISPLAY_HELPER
 	select DRM_ANALOGIX_DP
-	select DRM_DISPLAY_DP_HELPER
 	select DRM_KMS_HELPER
 	select REGMAP_I2C
 	help
@@ -34,9 +34,9 @@ config DRM_ANALOGIX_ANX7625
 	tristate "Analogix Anx7625 MIPI to DP interface support"
 	depends on DRM
 	depends on DRM_DISPLAY_DP_AUX_BUS
+	depends on DRM_DISPLAY_DP_HELPER
 	depends on DRM_DISPLAY_HELPER
 	depends on OF
-	select DRM_DISPLAY_DP_HELPER
 	select DRM_DISPLAY_HDCP_HELPER
 	select DRM_MIPI_DSI
 	help

drivers/gpu/drm/bridge/cadence/Kconfig

@@ -23,9 +23,9 @@ endif
 
 config DRM_CDNS_MHDP8546
 	tristate "Cadence DPI/DP bridge"
+	depends on DRM_DISPLAY_DP_HELPER
 	depends on DRM_DISPLAY_HELPER
 	depends on OF
-	select DRM_DISPLAY_DP_HELPER
 	select DRM_DISPLAY_HDCP_HELPER
 	select DRM_KMS_HELPER
 	select DRM_PANEL_BRIDGE

drivers/gpu/drm/display/Kconfig

@@ -39,6 +39,7 @@ config DRM_DISPLAY_DP_AUX_CHARDEV
 config DRM_DISPLAY_DP_HELPER
 	bool "DRM DisplayPort Helpers"
 	depends on DRM_DISPLAY_HELPER
+	default y
 	help
 	  DRM display helpers for DisplayPort.
 

drivers/gpu/drm/exynos/Kconfig

@@ -67,9 +67,9 @@ config DRM_EXYNOS_DSI
 config DRM_EXYNOS_DP
 	bool "Exynos specific extensions for Analogix DP driver"
 	depends on DRM_EXYNOS_FIMD || DRM_EXYNOS7_DECON
+	depends on DRM_DISPLAY_DP_HELPER
 	depends on DRM_DISPLAY_HELPER
 	select DRM_ANALOGIX_DP
-	select DRM_DISPLAY_DP_HELPER
 	default DRM_EXYNOS
 	select DRM_PANEL
 	help

drivers/gpu/drm/i915/Kconfig

@@ -2,6 +2,7 @@
 config DRM_I915
 	tristate "Intel 8xx/9xx/G3x/G4x/HD Graphics"
 	depends on DRM
+	depends on DRM_DISPLAY_DP_HELPER
 	depends on DRM_DISPLAY_HELPER
 	depends on X86 && PCI
 	depends on !PREEMPT_RT
@@ -11,7 +12,6 @@ config DRM_I915
 	# the shmem_readpage() which depends upon tmpfs
 	select SHMEM
 	select TMPFS
-	select DRM_DISPLAY_DP_HELPER
 	select DRM_DISPLAY_HDCP_HELPER
 	select DRM_DISPLAY_HDMI_HELPER
 	select DRM_KMS_HELPER

drivers/gpu/drm/mediatek/Kconfig

@@ -23,10 +23,10 @@ config DRM_MEDIATEK
 config DRM_MEDIATEK_DP
 	tristate "DRM DPTX Support for MediaTek SoCs"
 	depends on DRM_DISPLAY_DP_AUX_BUS
+	depends on DRM_DISPLAY_DP_HELPER
 	depends on DRM_DISPLAY_HELPER
 	depends on DRM_MEDIATEK
 	select PHY_MTK_DP
-	select DRM_DISPLAY_DP_HELPER
 	help
 	  DRM/KMS Display Port driver for MediaTek SoCs.
 

drivers/gpu/drm/msm/Kconfig

@@ -6,6 +6,7 @@ config DRM_MSM
 	depends on COMMON_CLK
 	depends on DRM
 	depends on DRM_DISPLAY_DP_AUX_BUS
+	depends on DRM_DISPLAY_DP_HELPER
 	depends on DRM_DISPLAY_HELPER
 	depends on IOMMU_SUPPORT
 	depends on QCOM_AOSS_QMP || QCOM_AOSS_QMP=n
@@ -16,7 +17,6 @@ config DRM_MSM
 	select IOMMU_IO_PGTABLE
 	select QCOM_MDT_LOADER if ARCH_QCOM
 	select REGULATOR
-	select DRM_DISPLAY_DP_HELPER
 	select DRM_EXEC
 	select DRM_KMS_HELPER
 	select DRM_PANEL

drivers/gpu/drm/nouveau/Kconfig

@@ -2,12 +2,12 @@
 config DRM_NOUVEAU
 	tristate "Nouveau (NVIDIA) cards"
 	depends on DRM
+	depends on DRM_DISPLAY_DP_HELPER
 	depends on DRM_DISPLAY_HELPER
 	depends on PCI
 	depends on MMU
 	select IOMMU_API
 	select FW_LOADER
-	select DRM_DISPLAY_DP_HELPER
 	select DRM_DISPLAY_HDMI_HELPER
 	select DRM_KMS_HELPER
 	select DRM_TTM

drivers/gpu/drm/panel/Kconfig

@@ -534,10 +534,10 @@ config DRM_PANEL_RAYDIUM_RM68200
 config DRM_PANEL_RAYDIUM_RM692E5
 	tristate "Raydium RM692E5-based DSI panel"
 	depends on BACKLIGHT_CLASS_DEVICE
+	depends on DRM_DISPLAY_DP_HELPER
 	depends on DRM_DISPLAY_HELPER
 	depends on DRM_MIPI_DSI
 	depends on OF
-	select DRM_DISPLAY_DP_HELPER
 	help
 	  Say Y here if you want to enable support for Raydium RM692E5-based
 	  display panels, such as the one found in the Fairphone 5 smartphone.
@@ -561,10 +561,10 @@ config DRM_PANEL_SAMSUNG_ATNA33XC20
 	tristate "Samsung ATNA33XC20 eDP panel"
 	depends on BACKLIGHT_CLASS_DEVICE
 	depends on DRM_DISPLAY_DP_AUX_BUS
+	depends on DRM_DISPLAY_DP_HELPER
 	depends on DRM_DISPLAY_HELPER
 	depends on OF
 	depends on PM
-	select DRM_DISPLAY_DP_HELPER
 	help
 	  DRM panel driver for the Samsung ATNA33XC20 panel. This panel can't
 	  be handled by the DRM_PANEL_SIMPLE driver because its power
@@ -801,11 +801,11 @@ config DRM_PANEL_EDP
 	tristate "support for simple Embedded DisplayPort panels"
 	depends on BACKLIGHT_CLASS_DEVICE
 	depends on DRM_DISPLAY_DP_AUX_BUS
+	depends on DRM_DISPLAY_DP_HELPER
 	depends on DRM_DISPLAY_HELPER
 	depends on OF
 	depends on PM
 	select VIDEOMODE_HELPERS
-	select DRM_DISPLAY_DP_HELPER
 	select DRM_KMS_HELPER
 	help
 	  DRM panel driver for dumb eDP panels that need at most a regulator and
@@ -880,10 +880,10 @@ config DRM_PANEL_TRULY_NT35597_WQXGA
 config DRM_PANEL_VISIONOX_R66451
 	tristate "Visionox R66451"
 	depends on BACKLIGHT_CLASS_DEVICE
+	depends on DRM_DISPLAY_DP_HELPER
 	depends on DRM_DISPLAY_HELPER
 	depends on DRM_MIPI_DSI
 	depends on OF
-	select DRM_DISPLAY_DP_HELPER
 	help
 	  Say Y here if you want to enable support for Visionox
 	  R66451 1080x2340 AMOLED DSI panel.

drivers/gpu/drm/radeon/Kconfig

@@ -4,11 +4,11 @@ config DRM_RADEON
 	tristate "ATI Radeon"
 	depends on AGP || !AGP
 	depends on DRM
+	depends on DRM_DISPLAY_DP_HELPER
 	depends on DRM_DISPLAY_HELPER
 	depends on PCI
 	depends on MMU
 	select FW_LOADER
-	select DRM_DISPLAY_DP_HELPER
         select DRM_KMS_HELPER
 	select DRM_SUBALLOC_HELPER
         select DRM_TTM

drivers/gpu/drm/rockchip/Kconfig

@@ -35,9 +35,9 @@ config ROCKCHIP_VOP2
 
 config ROCKCHIP_ANALOGIX_DP
 	bool "Rockchip specific extensions for Analogix DP driver"
+	depends on DRM_DISPLAY_DP_HELPER
 	depends on DRM_DISPLAY_HELPER
 	depends on ROCKCHIP_VOP
-	select DRM_DISPLAY_DP_HELPER
 	help
 	  This selects support for Rockchip SoC specific extensions
 	  for the Analogix Core DP driver. If you want to enable DP
@@ -45,9 +45,9 @@ config ROCKCHIP_ANALOGIX_DP
 
 config ROCKCHIP_CDN_DP
 	bool "Rockchip cdn DP"
+	depends on DRM_DISPLAY_DP_HELPER
 	depends on DRM_DISPLAY_HELPER
 	depends on EXTCON=y || (EXTCON=m && DRM_ROCKCHIP=m)
-	select DRM_DISPLAY_DP_HELPER
 	help
 	  This selects support for Rockchip SoC specific extensions
 	  for the cdn DP driver. If you want to enable Dp on

drivers/gpu/drm/tegra/Kconfig

@@ -5,9 +5,9 @@ config DRM_TEGRA
 	depends on COMMON_CLK
 	depends on DRM
 	depends on DRM_DISPLAY_DP_AUX_BUS
+	depends on DRM_DISPLAY_DP_HELPER
 	depends on DRM_DISPLAY_HELPER
 	depends on OF
-	select DRM_DISPLAY_DP_HELPER
 	select DRM_DISPLAY_HDMI_HELPER
 	select DRM_KMS_HELPER
 	select DRM_MIPI_DSI

drivers/gpu/drm/xe/Kconfig

@@ -3,6 +3,7 @@ config DRM_XE
 	tristate "Intel Xe Graphics"
 	depends on (m || (y && KUNIT=y))
 	depends on DRM
+	depends on DRM_DISPLAY_DP_HELPER
 	depends on DRM_DISPLAY_HELPER
 	depends on MMU
 	depends on PCI
@@ -17,7 +18,6 @@ config DRM_XE
 	select DRM_KUNIT_TEST_HELPERS if DRM_XE_KUNIT_TEST != n
 	select DRM_PANEL
 	select DRM_SUBALLOC_HELPER
-	select DRM_DISPLAY_DP_HELPER
 	select DRM_DISPLAY_HDCP_HELPER
 	select DRM_DISPLAY_HDMI_HELPER
 	select DRM_MIPI_DSI

drivers/gpu/drm/xlnx/Kconfig

@@ -4,12 +4,12 @@ config DRM_ZYNQMP_DPSUB
 	depends on COMMON_CLK
 	depends on DMADEVICES
 	depends on DRM
+	depends on DRM_DISPLAY_DP_HELPER
 	depends on DRM_DISPLAY_HELPER
 	depends on OF
 	depends on PHY_XILINX_ZYNQMP
 	depends on XILINX_ZYNQMP_DPDMA
 	select DMA_ENGINE
-	select DRM_DISPLAY_DP_HELPER
 	select DRM_GEM_DMA_HELPER
 	select DRM_KMS_HELPER
 	select GENERIC_PHY