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From:   Randy Dunlap <rdunlap@infradead.org>
To:     linux-kernel@vger.kernel.org
Cc:     Randy Dunlap <rdunlap@infradead.org>,
        Aleksandr Nogikh <nogikh@google.com>,
        Adam Ford <aford173@gmail.com>,
        Maxime Ripard <maxime.ripard@bootlin.com>,
        =?UTF-8?q?Guido=20G=C3=BCnther?= <agx@sigxcpu.org>,
        Robert Chiras <robert.chiras@nxp.com>,
        Sam Ravnborg <sam@ravnborg.org>,
        Neil Armstrong <neil.armstrong@linaro.org>,
        Andrzej Hajda <andrzej.hajda@intel.com>,
        Robert Foss <rfoss@kernel.org>,
        David Airlie <airlied@gmail.com>,
        Daniel Vetter <daniel@ffwll.ch>,
        dri-devel@lists.freedesktop.org
Subject: [PATCH] drm: bridge: for GENERIC_PHY_MIPI_DPHY also select GENERIC_PHY
Date:   Thu,  3 Aug 2023 20:01:37 -0700
Message-ID: <20230804030140.21395-1-rdunlap@infradead.org>
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Precedence: bulk

Three DRM bridge drivers select GENERIC_PHY_MIPI_DPHY when GENERIC_PHY
might not be set.  This causes Kconfig warnings and a build error.

WARNING: unmet direct dependencies detected for GENERIC_PHY_MIPI_DPHY
  Depends on [n]: GENERIC_PHY [=n]
  Selected by [y]:
  - DRM_NWL_MIPI_DSI [=y] && DRM_BRIDGE [=y] && DRM [=y] && COMMON_CLK [=y] && OF [=y] && HAS_IOMEM [=y]
  - DRM_SAMSUNG_DSIM [=y] && DRM [=y] && DRM_BRIDGE [=y] && COMMON_CLK [=y] && OF [=y] && HAS_IOMEM [=y]

(drm/bridge/cadence/Kconfig was found by inspection.)

aarch64-linux-ld: drivers/gpu/drm/bridge/samsung-dsim.o: in function `samsung_dsim_set_phy_ctrl':
drivers/gpu/drm/bridge/samsung-dsim.c:731: undefined reference to `phy_mipi_dphy_get_default_config_for_hsclk'

Prevent these warnings and build error by also selecting GENERIC_PHY
whenever selecting GENERIC_PHY_MIPI_DPHY.

Fixes: fced5a364dee ("drm/bridge: cdns: Convert to phy framework")
Fixes: 44cfc6233447 ("drm/bridge: Add NWL MIPI DSI host controller support")
Fixes: 171b3b1e0f8b ("drm: bridge: samsung-dsim: Select GENERIC_PHY_MIPI_DPHY")
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Reported-by: Aleksandr Nogikh <nogikh@google.com>
Link: lore.kernel.org/r/20230803144227.2187749-1-nogikh@google.com
Cc: Adam Ford <aford173@gmail.com>
Cc: Maxime Ripard <maxime.ripard@bootlin.com>
Cc: Guido Günther <agx@sigxcpu.org>
Cc: Robert Chiras <robert.chiras@nxp.com>
Cc: Sam Ravnborg <sam@ravnborg.org>
Cc: Neil Armstrong <neil.armstrong@linaro.org>
Cc: Andrzej Hajda <andrzej.hajda@intel.com>
Cc: Robert Foss <rfoss@kernel.org>
Cc: David Airlie <airlied@gmail.com>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: dri-devel@lists.freedesktop.org
---
 drivers/gpu/drm/bridge/Kconfig         |    2 ++
 drivers/gpu/drm/bridge/cadence/Kconfig |    1 +
 2 files changed, 3 insertions(+)

diff -- a/drivers/gpu/drm/bridge/cadence/Kconfig b/drivers/gpu/drm/bridge/cadence/Kconfig
--- a/drivers/gpu/drm/bridge/cadence/Kconfig
+++ b/drivers/gpu/drm/bridge/cadence/Kconfig
@@ -4,6 +4,7 @@ config DRM_CDNS_DSI
 	select DRM_KMS_HELPER
 	select DRM_MIPI_DSI
 	select DRM_PANEL_BRIDGE
+	select GENERIC_PHY
 	select GENERIC_PHY_MIPI_DPHY
 	depends on OF
 	help
diff -- a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
--- a/drivers/gpu/drm/bridge/Kconfig
+++ b/drivers/gpu/drm/bridge/Kconfig
@@ -181,6 +181,7 @@ config DRM_NWL_MIPI_DSI
 	select DRM_KMS_HELPER
 	select DRM_MIPI_DSI
 	select DRM_PANEL_BRIDGE
+	select GENERIC_PHY
 	select GENERIC_PHY_MIPI_DPHY
 	select MFD_SYSCON
 	select MULTIPLEXER
@@ -227,6 +228,7 @@ config DRM_SAMSUNG_DSIM
 	select DRM_KMS_HELPER
 	select DRM_MIPI_DSI
 	select DRM_PANEL_BRIDGE
+	select GENERIC_PHY
 	select GENERIC_PHY_MIPI_DPHY
 	help
 	  The Samsung MIPI DSIM bridge controller driver.