linux-kernel - Re: [PATCH] drm: msm: fix building without CONFIG_COMMON

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Date:   Mon, 18 Oct 2021 13:36:44 +0200
From:   Christian König <christian.koenig@....com>
To:     Arnd Bergmann <arnd@...nel.org>, Rob Clark <robdclark@...il.com>,
        Sean Paul <sean@...rly.run>, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Randy Dunlap <rdunlap@...radead.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Alex Elder <elder@...aro.org>,
        Akhil P Oommen <akhilpo@...eaurora.org>,
        Rajeev Nandan <rajeevny@...eaurora.org>,
        Abhinav Kumar <abhinavk@...eaurora.org>,
        linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm: msm: fix building without CONFIG_COMMON_CLK

Am 13.10.21 um 16:42 schrieb Arnd Bergmann:
> From: Arnd Bergmann <arnd@...db.de>
>
> When CONFIG_COMMON_CLOCK is disabled, the 8996 specific
> phy code is left out, which results in a link failure:
>
> ld: drivers/gpu/drm/msm/hdmi/hdmi_phy.o:(.rodata+0x3f0): undefined reference to `msm_hdmi_phy_8996_cfg'
>
> This was only exposed after it became possible to build
> test the driver without the clock interfaces.
>
> Make COMMON_CLK a hard dependency for compile testing,
> and simplify it a little based on that.
>
> Fixes: b3ed524f84f5 ("drm/msm: allow compile_test on !ARM")
> Reported-by: Randy Dunlap <rdunlap@...radead.org>
> Suggested-by: Geert Uytterhoeven <geert@...ux-m68k.org>
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>   drivers/gpu/drm/msm/Kconfig  | 2 +-
>   drivers/gpu/drm/msm/Makefile | 6 +++---
>   2 files changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/Kconfig b/drivers/gpu/drm/msm/Kconfig
> index f5107b6ded7b..cb204912e0f4 100644
> --- a/drivers/gpu/drm/msm/Kconfig
> +++ b/drivers/gpu/drm/msm/Kconfig
> @@ -4,8 +4,8 @@ config DRM_MSM
>   	tristate "MSM DRM"
>   	depends on DRM
>   	depends on ARCH_QCOM || SOC_IMX5 || COMPILE_TEST
> +	depends on COMMON_CLK
>   	depends on IOMMU_SUPPORT

We also need a "depends on MMU" here because some automated test is now 
trying to compile the driver on parisc as well.

I have absolutely no idea how a platform can have IOMMU but no MMU 
support but it indeed seems to be the case here.

Regards,
Christian.

> -	depends on (OF && COMMON_CLK) || COMPILE_TEST
>   	depends on QCOM_OCMEM || QCOM_OCMEM=n
>   	depends on QCOM_LLCC || QCOM_LLCC=n
>   	depends on QCOM_COMMAND_DB || QCOM_COMMAND_DB=n
> diff --git a/drivers/gpu/drm/msm/Makefile b/drivers/gpu/drm/msm/Makefile
> index 904535eda0c4..bbee22b54b0c 100644
> --- a/drivers/gpu/drm/msm/Makefile
> +++ b/drivers/gpu/drm/msm/Makefile
> @@ -23,8 +23,10 @@ msm-y := \
>   	hdmi/hdmi_i2c.o \
>   	hdmi/hdmi_phy.o \
>   	hdmi/hdmi_phy_8960.o \
> +	hdmi/hdmi_phy_8996.o \
>   	hdmi/hdmi_phy_8x60.o \
>   	hdmi/hdmi_phy_8x74.o \
> +	hdmi/hdmi_pll_8960.o \
>   	edp/edp.o \
>   	edp/edp_aux.o \
>   	edp/edp_bridge.o \
> @@ -37,6 +39,7 @@ msm-y := \
>   	disp/mdp4/mdp4_dtv_encoder.o \
>   	disp/mdp4/mdp4_lcdc_encoder.o \
>   	disp/mdp4/mdp4_lvds_connector.o \
> +	disp/mdp4/mdp4_lvds_pll.o \
>   	disp/mdp4/mdp4_irq.o \
>   	disp/mdp4/mdp4_kms.o \
>   	disp/mdp4/mdp4_plane.o \
> @@ -117,9 +120,6 @@ msm-$(CONFIG_DRM_MSM_DP)+= dp/dp_aux.o \
>   	dp/dp_audio.o
>   
>   msm-$(CONFIG_DRM_FBDEV_EMULATION) += msm_fbdev.o
> -msm-$(CONFIG_COMMON_CLK) += disp/mdp4/mdp4_lvds_pll.o
> -msm-$(CONFIG_COMMON_CLK) += hdmi/hdmi_pll_8960.o
> -msm-$(CONFIG_COMMON_CLK) += hdmi/hdmi_phy_8996.o
>   
>   msm-$(CONFIG_DRM_MSM_HDMI_HDCP) += hdmi/hdmi_hdcp.o
>