drm/msm: allow compile time selection of driver components

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@chromium.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/482508/
Link: https://lore.kernel.org/r/20220419155346.1272627-6-dmitry.baryshkov@linaro.orgSigned-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

drivers/gpu/drm/msm/Kconfig

@@ -47,12 +47,39 @@ 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
+
+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 (MDP5) 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"
@@ -117,3 +144,20 @@ 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

drivers/gpu/drm/msm/Makefile

@@ -16,6 +16,8 @@ msm-y := \
 	adreno/a6xx_gpu.o \
 	adreno/a6xx_gmu.o \
 	adreno/a6xx_hfi.o \
+
+msm-$(CONFIG_DRM_MSM_HDMI) += \
 	hdmi/hdmi.o \
 	hdmi/hdmi_audio.o \
 	hdmi/hdmi_bridge.o \
@@ -27,9 +29,10 @@ msm-y := \
 	hdmi/hdmi_phy_8x60.o \
 	hdmi/hdmi_phy_8x74.o \
 	hdmi/hdmi_pll_8960.o \
-	disp/mdp_format.o \
-	disp/mdp_kms.o \
+
+msm-$(CONFIG_DRM_MSM_MDP4) += \
 	disp/mdp4/mdp4_crtc.o \
+	disp/mdp4/mdp4_dsi_encoder.o \
 	disp/mdp4/mdp4_dtv_encoder.o \
 	disp/mdp4/mdp4_lcdc_encoder.o \
 	disp/mdp4/mdp4_lvds_connector.o \
@@ -37,7 +40,10 @@ msm-y := \
 	disp/mdp4/mdp4_irq.o \
 	disp/mdp4/mdp4_kms.o \
 	disp/mdp4/mdp4_plane.o \
+
+msm-$(CONFIG_DRM_MSM_MDP5) += \
 	disp/mdp5/mdp5_cfg.o \
+	disp/mdp5/mdp5_cmd_encoder.o \
 	disp/mdp5/mdp5_ctl.o \
 	disp/mdp5/mdp5_crtc.o \
 	disp/mdp5/mdp5_encoder.o \
@@ -47,6 +53,8 @@ msm-y := \
 	disp/mdp5/mdp5_mixer.o \
 	disp/mdp5/mdp5_plane.o \
 	disp/mdp5/mdp5_smp.o \
+
+msm-$(CONFIG_DRM_MSM_DPU) += \
 	disp/dpu1/dpu_core_perf.o \
 	disp/dpu1/dpu_crtc.o \
 	disp/dpu1/dpu_encoder.o \
@@ -69,6 +77,13 @@ msm-y := \
 	disp/dpu1/dpu_plane.o \
 	disp/dpu1/dpu_rm.o \
 	disp/dpu1/dpu_vbif.o \
+
+msm-$(CONFIG_DRM_MSM_MDSS) += \
+	msm_mdss.o \
+
+msm-y += \
+	disp/mdp_format.o \
+	disp/mdp_kms.o \
 	disp/msm_disp_snapshot.o \
 	disp/msm_disp_snapshot_util.o \
 	msm_atomic.o \
@@ -86,7 +101,6 @@ msm-y := \
 	msm_gpu_devfreq.o \
 	msm_io_utils.o \
 	msm_iommu.o \
-	msm_mdss.o \
 	msm_perf.o \
 	msm_rd.o \
 	msm_ringbuffer.o \
@@ -117,12 +131,10 @@ msm-$(CONFIG_DRM_FBDEV_EMULATION) += msm_fbdev.o
 msm-$(CONFIG_DRM_MSM_HDMI_HDCP) += hdmi/hdmi_hdcp.o
 
 msm-$(CONFIG_DRM_MSM_DSI) += dsi/dsi.o \
-			disp/mdp4/mdp4_dsi_encoder.o \
 			dsi/dsi_cfg.o \
 			dsi/dsi_host.o \
 			dsi/dsi_manager.o \
-			dsi/phy/dsi_phy.o \
-			disp/mdp5/mdp5_cmd_encoder.o
+			dsi/phy/dsi_phy.o
 
 msm-$(CONFIG_DRM_MSM_DSI_28NM_PHY) += dsi/phy/dsi_phy_28nm.o
 msm-$(CONFIG_DRM_MSM_DSI_20NM_PHY) += dsi/phy/dsi_phy_20nm.o

drivers/gpu/drm/msm/disp/mdp4/mdp4_dsi_encoder.c

@@ -11,6 +11,8 @@
 
 #include "mdp4_kms.h"
 
+#ifdef CONFIG_DRM_MSM_DSI
+
 struct mdp4_dsi_encoder {
 	struct drm_encoder base;
 	struct drm_panel *panel;
@@ -170,3 +172,4 @@ struct drm_encoder *mdp4_dsi_encoder_init(struct drm_device *dev)
 
 	return ERR_PTR(ret);
 }
+#endif /* CONFIG_DRM_MSM_DSI */

drivers/gpu/drm/msm/disp/mdp5/mdp5_cmd_encoder.c

@@ -8,6 +8,8 @@
 
 #include "mdp5_kms.h"
 
+#ifdef CONFIG_DRM_MSM_DSI
+
 static struct mdp5_kms *get_kms(struct drm_encoder *encoder)
 {
 	struct msm_drm_private *priv = encoder->dev->dev_private;
@@ -198,3 +200,4 @@ int mdp5_cmd_encoder_set_split_display(struct drm_encoder *encoder,
 
 	return 0;
 }
+#endif /* CONFIG_DRM_MSM_DSI */

drivers/gpu/drm/msm/msm_drv.h

@@ -291,10 +291,20 @@ 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
@@ -409,14 +419,37 @@ 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);

drivers/gpu/drm/msm/msm_mdss.c

@@ -312,8 +312,17 @@ 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)