Re: [Freedreno] [PATCH v3 5/5] drm/msm: allow compile time selection of driver components

[Abhinav Kumar <quic_abhinavk@xxxxxxxxxxx>]

On 3/16/2022 12:31 AM, Dmitry Baryshkov wrote:
> On 16/03/2022 03:28, Abhinav Kumar wrote:
> > On 3/3/2022 7:21 PM, Dmitry Baryshkov wrote:
> > > MSM DRM driver already allows one to compile out the DP or DSI support.
> > > Add support for disabling other features like MDP4/MDP5/DPU drivers or
> > > direct HDMI output support.
> > >
> > > Suggested-by: Stephen Boyd <swboyd@xxxxxxxxxxxx>
> > > Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
> > > ---
> > >   drivers/gpu/drm/msm/Kconfig    | 50 ++++++++++++++++++++++++++++++++--
> > >   drivers/gpu/drm/msm/Makefile   | 18 ++++++++++--
> > >   drivers/gpu/drm/msm/msm_drv.h  | 33 ++++++++++++++++++++++
> > >   drivers/gpu/drm/msm/msm_mdss.c | 13 +++++++--
> > >   4 files changed, 106 insertions(+), 8 deletions(-)
> > >
> > > diff --git a/drivers/gpu/drm/msm/Kconfig b/drivers/gpu/drm/msm/Kconfig
> > > index 9b019598e042..3735fd41eb3b 100644
> > > --- a/drivers/gpu/drm/msm/Kconfig
> > > +++ b/drivers/gpu/drm/msm/Kconfig
> > > @@ -46,12 +46,39 @@ config DRM_MSM_GPU_SUDO
> > >         Only use this if you are a driver developer.  This should *not*
> > >         be enabled for production kernels.  If unsure, say N.
> > > -config DRM_MSM_HDMI_HDCP
> > > -    bool "Enable HDMI HDCP support in MSM DRM driver"
> > > +config DRM_MSM_MDSS
> > > +    bool
> > > +    depends on DRM_MSM
> > > +    default n
> > shouldnt DRM_MSM_MDSS be defaulted to y?
>
> No, it will be selected either by MDP5 or by DPU1. It is not used if 
> DRM_MSM is compiled with just MDP4 or headless support in mind.
Ok got it.
> > Another question is the compilation validation of the combinations of 
> > these.
> >
> > So we need to try:
> >
> > 1) DRM_MSM_MDSS + DRM_MSM_MDP4
> > 2) DRM_MSM_MDSS + DRM_MSM_MDP5
> > 3) DRM_MSM_MDSS + DRM_MSM_DPU
> >
> > Earlier since all of them were compiled together any 
> > inter-dependencies will not show up. Now since we are separating it 
> > out, just wanted to make sure each of the combos compile?
>
> I think you meant:
> - headless
> - MDP4
> - MDP5
> - DPU1
> - MDP4 + MDP5
> - MDP4 + DPU1
> - MDP5 + DPU1
> - all three drivers
Yes, each of these combinations.
> > > +
> > > +config DRM_MSM_MDP4
> > > +    bool "Enable MDP4 support in MSM DRM driver"
> > >       depends on DRM_MSM
> > >       default y
> > >       help
> > > -      Choose this option to enable HDCP state machine
> > > +      Compile in support for the Mobile Display Processor v4 (MDP4) in
> > > +      the MSM DRM driver. It is the older display controller found in
> > > +      devices using APQ8064/MSM8960/MSM8x60 platforms.
> > > +
> > > +config DRM_MSM_MDP5
> > > +    bool "Enable MDP5 support in MSM DRM driver"
> > > +    depends on DRM_MSM
> > > +    select DRM_MSM_MDSS
> > > +    default y
> > > +    help
> > > +      Compile in support for the Mobile Display Processor v5 (MDP4) in
> > > +      the MSM DRM driver. It is the display controller found in devices
> > > +      using e.g. APQ8016/MSM8916/APQ8096/MSM8996/MSM8974/SDM6x0 
> > > platforms.
> > > +
> > > +config DRM_MSM_DPU
> > > +    bool "Enable DPU support in MSM DRM driver"
> > > +    depends on DRM_MSM
> > > +    select DRM_MSM_MDSS
> > > +    default y
> > > +    help
> > > +      Compile in support for the Display Processing Unit in
> > > +      the MSM DRM driver. It is the display controller found in devices
> > > +      using e.g. SDM845 and newer platforms.
> > >   config DRM_MSM_DP
> > >       bool "Enable DisplayPort support in MSM DRM driver"
> > > @@ -116,3 +143,20 @@ config DRM_MSM_DSI_7NM_PHY
> > >       help
> > >         Choose this option if DSI PHY on SM8150/SM8250/SC7280 is used on
> > >         the platform.
> > > +
> > > +config DRM_MSM_HDMI
> > > +    bool "Enable HDMI support in MSM DRM driver"
> > > +    depends on DRM_MSM
> > > +    default y
> > > +    help
> > > +      Compile in support for the HDMI output MSM DRM driver. It can
> > > +      be a primary or a secondary display on device. Note that this 
> > > is used
> > > +      only for the direct HDMI output. If the device outputs HDMI data
> > > +      throught some kind of DSI-to-HDMI bridge, this option can be 
> > > disabled.
> > > +
> > > +config DRM_MSM_HDMI_HDCP
> > > +    bool "Enable HDMI HDCP support in MSM DRM driver"
> > > +    depends on DRM_MSM && DRM_MSM_HDMI
> > > +    default y
> > > +    help
> > > +      Choose this option to enable HDCP state machine
> > > diff --git a/drivers/gpu/drm/msm/Makefile b/drivers/gpu/drm/msm/Makefile
> > > index e76927b42033..5fe9c20ab9ee 100644
> > > --- a/drivers/gpu/drm/msm/Makefile
> > > +++ b/drivers/gpu/drm/msm/Makefile
> > > @@ -16,6 +16,8 @@ msm-y := \
> > >       adreno/a6xx_gpu.o \
> > >       adreno/a6xx_gmu.o \
> > >       adreno/a6xx_hfi.o \
> > > +
> > > +msm-$(CONFIG_DRM_MSM_HDMI) += \
> > >       hdmi/hdmi.o \
> > >       hdmi/hdmi_audio.o \
> > >       hdmi/hdmi_bridge.o \
> > > @@ -27,8 +29,8 @@ msm-y := \
> > >       hdmi/hdmi_phy_8x60.o \
> > >       hdmi/hdmi_phy_8x74.o \
> > >       hdmi/hdmi_pll_8960.o \
> > > -    disp/mdp_format.o \
> > > -    disp/mdp_kms.o \
> > > +
> > > +msm-$(CONFIG_DRM_MSM_MDP4) += \
> > >       disp/mdp4/mdp4_crtc.o \
> > >       disp/mdp4/mdp4_dtv_encoder.o \
> > >       disp/mdp4/mdp4_lcdc_encoder.o \
> > > @@ -37,6 +39,8 @@ msm-y := \
> > >       disp/mdp4/mdp4_irq.o \
> > >       disp/mdp4/mdp4_kms.o \
> > >       disp/mdp4/mdp4_plane.o \
> > > +
> > > +msm-$(CONFIG_DRM_MSM_MDP5) += \
> > >       disp/mdp5/mdp5_cfg.o \
> > >       disp/mdp5/mdp5_ctl.o \
> > >       disp/mdp5/mdp5_crtc.o \
> > > @@ -47,6 +51,8 @@ msm-y := \
> > >       disp/mdp5/mdp5_mixer.o \
> > >       disp/mdp5/mdp5_plane.o \
> > >       disp/mdp5/mdp5_smp.o \
> > > +
> > > +msm-$(CONFIG_DRM_MSM_DPU) += \
> > >       disp/dpu1/dpu_core_perf.o \
> > >       disp/dpu1/dpu_crtc.o \
> > >       disp/dpu1/dpu_encoder.o \
> > > @@ -69,6 +75,13 @@ msm-y := \
> > >       disp/dpu1/dpu_plane.o \
> > >       disp/dpu1/dpu_rm.o \
> > >       disp/dpu1/dpu_vbif.o \
> > > +
> > > +msm-$(CONFIG_DRM_MSM_MDSS) += \
> > > +    msm_mdss.o \
> > > +
> > > +msm-y += \
> > > +    disp/mdp_format.o \
> > > +    disp/mdp_kms.o \
> > >       disp/msm_disp_snapshot.o \
> > >       disp/msm_disp_snapshot_util.o \
> > >       msm_atomic.o \
> > > @@ -86,7 +99,6 @@ msm-y := \
> > >       msm_gpu_devfreq.o \
> > >       msm_io_utils.o \
> > >       msm_iommu.o \
> > > -    msm_mdss.o \
> > >       msm_perf.o \
> > >       msm_rd.o \
> > >       msm_ringbuffer.o \
> > > diff --git a/drivers/gpu/drm/msm/msm_drv.h 
> > > b/drivers/gpu/drm/msm/msm_drv.h
> > > index c1aaadfbea34..6bad7e7b479d 100644
> > > --- a/drivers/gpu/drm/msm/msm_drv.h
> > > +++ b/drivers/gpu/drm/msm/msm_drv.h
> > > @@ -314,10 +314,20 @@ struct drm_fb_helper *msm_fbdev_init(struct 
> > > drm_device *dev);
> > >   void msm_fbdev_free(struct drm_device *dev);
> > >   struct hdmi;
> > > +#ifdef CONFIG_DRM_MSM_HDMI
> > >   int msm_hdmi_modeset_init(struct hdmi *hdmi, struct drm_device *dev,
> > >           struct drm_encoder *encoder);
> > >   void __init msm_hdmi_register(void);
> > >   void __exit msm_hdmi_unregister(void);
> > > +#else
> > > +static inline int msm_hdmi_modeset_init(struct hdmi *hdmi, struct 
> > > drm_device *dev,
> > > +        struct drm_encoder *encoder)
> > > +{
> > > +    return -EINVAL;
> > > +}
> > > +static inline void __init msm_hdmi_register(void) {}
> > > +static inline void __exit msm_hdmi_unregister(void) {}
> > > +#endif
> > >   struct msm_dsi;
> > >   #ifdef CONFIG_DRM_MSM_DSI
> > > @@ -432,14 +442,37 @@ static inline void msm_dp_debugfs_init(struct 
> > > msm_dp *dp_display,
> > >   #endif
> > > +#ifdef CONFIG_DRM_MSM_MDP4
> > >   void msm_mdp4_register(void);
> > >   void msm_mdp4_unregister(void);
> > > +#else
> > > +static inline void msm_mdp4_register(void) {}
> > > +static inline void msm_mdp4_unregister(void) {}
> > > +#endif
> > > +
> > > +#ifdef CONFIG_DRM_MSM_MDP5
> > >   void msm_mdp_register(void);
> > >   void msm_mdp_unregister(void);
> > > +#else
> > > +static inline void msm_mdp_register(void) {}
> > > +static inline void msm_mdp_unregister(void) {}
> > > +#endif
> > > +
> > > +#ifdef CONFIG_DRM_MSM_DPU
> > >   void msm_dpu_register(void);
> > >   void msm_dpu_unregister(void);
> > > +#else
> > > +static inline void msm_dpu_register(void) {}
> > > +static inline void msm_dpu_unregister(void) {}
> > > +#endif
> > > +
> > > +#ifdef CONFIG_DRM_MSM_MDSS
> > >   void msm_mdss_register(void);
> > >   void msm_mdss_unregister(void);
> > > +#else
> > > +static inline void msm_mdss_register(void) {}
> > > +static inline void msm_mdss_unregister(void) {}
> > > +#endif
> > >   #ifdef CONFIG_DEBUG_FS
> > >   void msm_framebuffer_describe(struct drm_framebuffer *fb, struct 
> > > seq_file *m);
> > > diff --git a/drivers/gpu/drm/msm/msm_mdss.c 
> > > b/drivers/gpu/drm/msm/msm_mdss.c
> > > index 4d25d8955301..66714b356762 100644
> > > --- a/drivers/gpu/drm/msm/msm_mdss.c
> > > +++ b/drivers/gpu/drm/msm/msm_mdss.c
> > > @@ -303,8 +303,17 @@ static const struct dev_pm_ops mdss_pm_ops = {
> > >   static int find_mdp_node(struct device *dev, void *data)
> > >   {
> > > -    return of_match_node(dpu_dt_match, dev->of_node) ||
> > > -        of_match_node(mdp5_dt_match, dev->of_node);
> > > +#ifdef CONFIG_DRM_MSM_DPU
> > > +    if (of_match_node(dpu_dt_match, dev->of_node))
> > > +        return true;
> > > +#endif
> > > +
> > > +#ifdef CONFIG_DRM_MSM_MDP5
> > > +    if (of_match_node(mdp5_dt_match, dev->of_node))
> > > +        return true;
> > > +#endif
> > > +
> > > +    return false;
> > >   }
> > >   static int mdss_probe(struct platform_device *pdev)