Selecting CONFIG_HDMI for S390 is inappropriate - there is no real graphic hardware on this architecture. The drm subsystem is only enabled here for using the virtual graphics card "virtio-gpu". So it should be possible to compile the drm subsystem also without CONFIG_I2C. Tweak the Makefile to only compile the affected files with CONFIG_I2C=y and disable some I2C-related code in drm_edid.c.
Signed-off-by: Thomas Huth thuth@redhat.com --- drivers/gpu/drm/Kconfig | 4 ++-- drivers/gpu/drm/Makefile | 16 +++++++++------- drivers/gpu/drm/drm_edid.c | 10 +++++++--- 3 files changed, 18 insertions(+), 12 deletions(-)
diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig index 298a518..c9df67f 100644 --- a/drivers/gpu/drm/Kconfig +++ b/drivers/gpu/drm/Kconfig @@ -10,8 +10,8 @@ menuconfig DRM select DRM_PANEL_ORIENTATION_QUIRKS select HDMI if !S390 select FB_CMDLINE - select I2C - select I2C_ALGOBIT + select I2C if !S390 + select I2C_ALGOBIT if !S390 select DMA_SHARED_BUFFER select SYNC_FILE help diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile index 16fd8e3..4cf53ba 100644 --- a/drivers/gpu/drm/Makefile +++ b/drivers/gpu/drm/Makefile @@ -7,10 +7,9 @@ drm-y := drm_auth.o drm_bufs.o drm_cache.o \ drm_context.o drm_dma.o \ drm_file.o drm_gem.o drm_ioctl.o drm_irq.o \ drm_lock.o drm_memory.o drm_drv.o \ - drm_scatter.o drm_pci.o \ + drm_scatter.o drm_pci.o drm_info.o \ drm_sysfs.o drm_hashtab.o drm_mm.o \ drm_crtc.o drm_fourcc.o drm_modes.o drm_edid.o \ - drm_info.o drm_encoder_slave.o \ drm_trace_points.o drm_global.o drm_prime.o \ drm_rect.o drm_vma_manager.o drm_flip_work.o \ drm_modeset_lock.o drm_atomic.o drm_bridge.o \ @@ -20,6 +19,7 @@ drm-y := drm_auth.o drm_bufs.o drm_cache.o \ drm_dumb_buffers.o drm_mode_config.o drm_vblank.o \ drm_syncobj.o drm_lease.o
+drm-$(CONFIG_I2C) += drm_encoder_slave.o drm-$(CONFIG_HDMI) += drm_hdmi.o drm-$(CONFIG_DRM_LIB_RANDOM) += lib/drm_random.o drm-$(CONFIG_DRM_VM) += drm_vm.o @@ -32,11 +32,13 @@ drm-$(CONFIG_AGP) += drm_agpsupport.o drm-$(CONFIG_DEBUG_FS) += drm_debugfs.o drm_debugfs_crc.o drm-$(CONFIG_DRM_LOAD_EDID_FIRMWARE) += drm_edid_load.o
-drm_kms_helper-y := drm_crtc_helper.o drm_dp_helper.o drm_probe_helper.o \ - drm_plane_helper.o drm_dp_mst_topology.o drm_atomic_helper.o \ - drm_kms_helper_common.o drm_dp_dual_mode_helper.o \ - drm_simple_kms_helper.o drm_modeset_helper.o \ - drm_scdc_helper.o drm_gem_framebuffer_helper.o +drm_kms_helper-y := drm_crtc_helper.o drm_probe_helper.o \ + drm_plane_helper.o drm_atomic_helper.o \ + drm_gem_framebuffer_helper.o drm_kms_helper_common.o \ + drm_simple_kms_helper.o drm_modeset_helper.o + +drm_kms_helper-$(CONFIG_I2C) += drm_dp_helper.o drm_dp_mst_topology.o \ + drm_dp_dual_mode_helper.o drm_scdc_helper.o
drm_kms_helper-$(CONFIG_DRM_PANEL_BRIDGE) += bridge/panel.o drm_kms_helper-$(CONFIG_DRM_FBDEV_EMULATION) += drm_fb_helper.o diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c index 3820763..0d0d5af 100644 --- a/drivers/gpu/drm/drm_edid.c +++ b/drivers/gpu/drm/drm_edid.c @@ -1467,11 +1467,14 @@ bool drm_edid_is_valid(struct edid *edid) static int drm_do_probe_ddc_edid(void *data, u8 *buf, unsigned int block, size_t len) { - struct i2c_adapter *adapter = data; - unsigned char start = block * EDID_LENGTH; unsigned char segment = block >> 1; unsigned char xfers = segment ? 3 : 2; - int ret, retries = 5; + int ret = -1; + +#if IS_ENABLED(CONFIG_I2C) + struct i2c_adapter *adapter = data; + unsigned char start = block * EDID_LENGTH; + int retries = 5;
/* * The core I2C driver will automatically retry the transfer if the @@ -1512,6 +1515,7 @@ bool drm_edid_is_valid(struct edid *edid) break; } } while (ret != xfers && --retries); +#endif /* CONFIG_I2C */
return ret == xfers ? 0 : -1; }