linux-kernel - Re: [PATCH] drm: bridge: for GENERIC_PHY_MIPI_DPHY also select GENERIC

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Date:   Fri, 4 Aug 2023 06:22:44 -0500
From:   Adam Ford <aford173@...il.com>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     linux-kernel@...r.kernel.org, Aleksandr Nogikh <nogikh@...gle.com>,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        Guido Günther <agx@...xcpu.org>,
        Robert Chiras <robert.chiras@....com>,
        Sam Ravnborg <sam@...nborg.org>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Andrzej Hajda <andrzej.hajda@...el.com>,
        Robert Foss <rfoss@...nel.org>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH] drm: bridge: for GENERIC_PHY_MIPI_DPHY also select GENERIC_PHY

On Thu, Aug 3, 2023 at 10:01 PM Randy Dunlap <rdunlap@...radead.org> wrote:
>
> 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.
>

Reviewed-by: Adam Ford <aford173@...il.com>

> 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@...radead.org>
> Reported-by: Aleksandr Nogikh <nogikh@...gle.com>
> Link: lore.kernel.org/r/20230803144227.2187749-1-nogikh@...gle.com
> Cc: Adam Ford <aford173@...il.com>
> Cc: Maxime Ripard <maxime.ripard@...tlin.com>
> Cc: Guido Günther <agx@...xcpu.org>
> Cc: Robert Chiras <robert.chiras@....com>
> Cc: Sam Ravnborg <sam@...nborg.org>
> Cc: Neil Armstrong <neil.armstrong@...aro.org>
> Cc: Andrzej Hajda <andrzej.hajda@...el.com>
> Cc: Robert Foss <rfoss@...nel.org>
> Cc: David Airlie <airlied@...il.com>
> Cc: Daniel Vetter <daniel@...ll.ch>
> Cc: dri-devel@...ts.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.