This patch adds the cec_notifier feature to amdgpu driver. The changes will allow amdgpu driver code to notify EDID and HPD changes to an eventual CEC adapter. Signed-off-by: Kun Liu <Kun.Liu2@xxxxxxx> --- drivers/gpu/drm/amd/display/Kconfig | 2 + .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 82 +++++++++++++++++++ .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h | 4 + .../amd/display/amdgpu_dm/amdgpu_dm_debugfs.c | 66 ++++++++++++++- drivers/gpu/drm/amd/include/amd_shared.h | 5 ++ 5 files changed, 158 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/amd/display/Kconfig b/drivers/gpu/drm/amd/display/Kconfig index 11e3f2f3b1..abd3b65643 100644 --- a/drivers/gpu/drm/amd/display/Kconfig +++ b/drivers/gpu/drm/amd/display/Kconfig @@ -8,6 +8,8 @@ config DRM_AMD_DC bool "AMD DC - Enable new display engine" default y depends on BROKEN || !CC_IS_CLANG || ARM64 || LOONGARCH || RISCV || SPARC64 || X86_64 + select CEC_CORE + select CEC_NOTIFIER select SND_HDA_COMPONENT if SND_HDA_CORE # !CC_IS_CLANG: https://github.com/ClangBuiltLinux/linux/issues/1752 select DRM_AMD_DC_FP if ARCH_HAS_KERNEL_FPU_SUPPORT && !(CC_IS_CLANG && (ARM64 || LOONGARCH || RISCV)) diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c index 85f21db6ef..3bd93cc14f 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c @@ -97,6 +97,7 @@ #include <drm/drm_audio_component.h> #include <drm/drm_gem_atomic_helper.h> +#include <media/cec-notifier.h> #include <acpi/video.h> #include "ivsrcid/dcn/irqsrcs_dcn_1_0.h" @@ -2746,6 +2747,54 @@ static void resume_mst_branch_status(struct drm_dp_mst_topology_mgr *mgr) mutex_unlock(&mgr->lock); } +static void hdmi_cec_unset_edid(struct amdgpu_dm_connector *aconnector) +{ + struct drm_device *ddev = aconnector->base.dev; + struct cec_notifier *n = aconnector->notifier; + + if (!n) { + drm_dbg(ddev, "failed to unset edid\n"); + return; + } + + cec_notifier_phys_addr_invalidate(n); +} + +static void hdmi_cec_set_edid(struct amdgpu_dm_connector *aconnector) +{ + struct drm_connector *connector = &aconnector->base; + struct drm_device *ddev = aconnector->base.dev; + struct cec_notifier *n = aconnector->notifier; + + if (!n) { + drm_dbg(ddev, "failed to set edid\n"); + return; + } + + cec_notifier_set_phys_addr(n, + connector->display_info.source_physical_address); +} + +static void s3_handle_hdmi_cec(struct drm_device *ddev, bool suspend) +{ + struct amdgpu_dm_connector *aconnector; + struct drm_connector *connector; + struct drm_connector_list_iter conn_iter; + + drm_connector_list_iter_begin(ddev, &conn_iter); + drm_for_each_connector_iter(connector, &conn_iter) { + if (connector->connector_type == DRM_MODE_CONNECTOR_WRITEBACK) + continue; + + aconnector = to_amdgpu_dm_connector(connector); + if (suspend) + hdmi_cec_unset_edid(aconnector); + else + hdmi_cec_set_edid(aconnector); + } + drm_connector_list_iter_end(&conn_iter); +} + static void s3_handle_mst(struct drm_device *dev, bool suspend) { struct amdgpu_dm_connector *aconnector; @@ -3017,6 +3066,8 @@ static int dm_suspend(struct amdgpu_ip_block *ip_block) if (IS_ERR(adev->dm.cached_state)) return PTR_ERR(adev->dm.cached_state); + s3_handle_hdmi_cec(adev_to_drm(adev), true); + s3_handle_mst(adev_to_drm(adev), true); amdgpu_dm_irq_suspend(adev); @@ -3289,6 +3340,8 @@ static int dm_resume(struct amdgpu_ip_block *ip_block) */ amdgpu_dm_irq_resume_early(adev); + s3_handle_hdmi_cec(ddev, false); + /* On resume we need to rewrite the MSTM control bits to enable MST*/ s3_handle_mst(ddev, false); @@ -3598,6 +3651,7 @@ void amdgpu_dm_update_connector_after_detect( dc_sink_retain(aconnector->dc_sink); if (sink->dc_edid.length == 0) { aconnector->drm_edid = NULL; + hdmi_cec_unset_edid(aconnector); if (aconnector->dc_link->aux_mode) { drm_dp_cec_unset_edid(&aconnector->dm_dp_aux.aux); } @@ -3607,6 +3661,7 @@ void amdgpu_dm_update_connector_after_detect( aconnector->drm_edid = drm_edid_alloc(edid, sink->dc_edid.length); drm_edid_connector_update(connector, aconnector->drm_edid); + hdmi_cec_set_edid(aconnector); if (aconnector->dc_link->aux_mode) drm_dp_cec_attach(&aconnector->dm_dp_aux.aux, connector->display_info.source_physical_address); @@ -3623,6 +3678,7 @@ void amdgpu_dm_update_connector_after_detect( amdgpu_dm_update_freesync_caps(connector, aconnector->drm_edid); update_connector_ext_caps(aconnector); } else { + hdmi_cec_unset_edid(aconnector); drm_dp_cec_unset_edid(&aconnector->dm_dp_aux.aux); amdgpu_dm_update_freesync_caps(connector, NULL); aconnector->num_modes = 0; @@ -7042,6 +7098,7 @@ static void amdgpu_dm_connector_unregister(struct drm_connector *connector) if (amdgpu_dm_should_create_sysfs(amdgpu_dm_connector)) sysfs_remove_group(&connector->kdev->kobj, &amdgpu_group); + cec_notifier_conn_unregister(amdgpu_dm_connector->notifier); drm_dp_aux_unregister(&amdgpu_dm_connector->dm_dp_aux.aux); } @@ -8278,6 +8335,27 @@ create_i2c(struct ddc_service *ddc_service, return i2c; } +int amdgpu_dm_initialize_hdmi_connector(struct amdgpu_dm_connector *aconnector) +{ + struct cec_connector_info conn_info; + struct drm_device *ddev = aconnector->base.dev; + struct device *hdmi_dev = ddev->dev; + + if (amdgpu_dc_debug_mask & DC_DISABLE_HDMI_CEC) { + drm_info(ddev, "HDMI-CEC feature masked\n"); + return -EINVAL; + } + + cec_fill_conn_info_from_drm(&conn_info, &aconnector->base); + aconnector->notifier = + cec_notifier_conn_register(hdmi_dev, NULL, &conn_info); + if (!aconnector->notifier) { + drm_err(ddev, "Failed to create cec notifier\n"); + return -ENOMEM; + } + + return 0; +} /* * Note: this function assumes that dc_link_detect() was called for the @@ -8341,6 +8419,10 @@ static int amdgpu_dm_connector_init(struct amdgpu_display_manager *dm, drm_connector_attach_encoder( &aconnector->base, &aencoder->base); + if (connector_type == DRM_MODE_CONNECTOR_HDMIA + || connector_type == DRM_MODE_CONNECTOR_HDMIB) + amdgpu_dm_initialize_hdmi_connector(aconnector); + if (connector_type == DRM_MODE_CONNECTOR_DisplayPort || connector_type == DRM_MODE_CONNECTOR_eDP) amdgpu_dm_initialize_dp_connector(dm, aconnector, link->link_index); diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h index 6464a83783..4c1942652b 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h @@ -671,6 +671,8 @@ struct amdgpu_dm_connector { uint32_t connector_id; int bl_idx; + struct cec_notifier *notifier; + /* we need to mind the EDID between detect and get modes due to analog/digital/tvencoder */ const struct drm_edid *drm_edid; @@ -1010,4 +1012,6 @@ void dm_free_gpu_mem(struct amdgpu_device *adev, bool amdgpu_dm_is_headless(struct amdgpu_device *adev); +int amdgpu_dm_initialize_hdmi_connector(struct amdgpu_dm_connector *aconnector); + #endif /* __AMDGPU_DM_H__ */ diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c index 6a97bb2d91..922f329175 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c @@ -25,6 +25,7 @@ #include <linux/string_helpers.h> #include <linux/uaccess.h> +#include <media/cec-notifier.h> #include "dc.h" #include "amdgpu.h" @@ -2825,6 +2826,67 @@ static int is_dpia_link_show(struct seq_file *m, void *data) return 0; } +/* + * function description: Read out the HDMI-CEC feature status + * + * Example usage: + * cat /sys/kernel/debug/dri/0/HDMI-A-1/hdmi_cec_state + */ +static int hdmi_cec_state_show(struct seq_file *m, void *data) +{ + struct drm_connector *connector = m->private; + struct amdgpu_dm_connector *aconnector = to_amdgpu_dm_connector(connector); + + seq_printf(m, "%s:%d\n", connector->name, connector->base.id); + seq_printf(m, "HDMI-CEC status: %d\n", aconnector->notifier ? 1:0); + + return 0; +} + +/* + * function: Enable/Disable HDMI-CEC feature from driver side + * + * Example usage: + * echo 1 > /sys/kernel/debug/dri/0/HDMI-A-1/hdmi_cec_state + * echo 0 > /sys/kernel/debug/dri/0/HDMI-A-1/hdmi_cec_state + */ +static ssize_t hdmi_cec_state_write(struct file *f, const char __user *buf, + size_t size, loff_t *pos) +{ + char tmp[2]; + int ret; + struct amdgpu_dm_connector *aconnector = file_inode(f)->i_private; + struct drm_connector *dconn = &aconnector->base; + struct drm_device *ddev = aconnector->base.dev; + + if (size == 0) + return -EINVAL; + + if (copy_from_user(tmp, buf, 1)) { + drm_dbg_driver(ddev, "Failed to copy user data !\n"); + return -EFAULT; + } + + switch (tmp[0]) { + case '0': + cec_notifier_conn_unregister(aconnector->notifier); + aconnector->notifier = NULL; + break; + case '1': + ret = amdgpu_dm_initialize_hdmi_connector(aconnector); + if (ret) + return ret; + cec_notifier_set_phys_addr(aconnector->notifier, + dconn->display_info.source_physical_address); + break; + default: + drm_dbg_driver(ddev, "Unsupported param\n"); + break; + } + + return size; +} + DEFINE_SHOW_ATTRIBUTE(dp_dsc_fec_support); DEFINE_SHOW_ATTRIBUTE(dmub_fw_state); DEFINE_SHOW_ATTRIBUTE(dmub_tracebuffer); @@ -2837,6 +2899,7 @@ DEFINE_SHOW_ATTRIBUTE(psr_capability); DEFINE_SHOW_ATTRIBUTE(dp_is_mst_connector); DEFINE_SHOW_ATTRIBUTE(dp_mst_progress_status); DEFINE_SHOW_ATTRIBUTE(is_dpia_link); +DEFINE_SHOW_STORE_ATTRIBUTE(hdmi_cec_state); static const struct file_operations dp_dsc_clock_en_debugfs_fops = { .owner = THIS_MODULE, @@ -2972,7 +3035,8 @@ static const struct { char *name; const struct file_operations *fops; } hdmi_debugfs_entries[] = { - {"hdcp_sink_capability", &hdcp_sink_capability_fops} + {"hdcp_sink_capability", &hdcp_sink_capability_fops}, + {"hdmi_cec_state", &hdmi_cec_state_fops} }; /* diff --git a/drivers/gpu/drm/amd/include/amd_shared.h b/drivers/gpu/drm/amd/include/amd_shared.h index 98d9e840b0..05bdb4e020 100644 --- a/drivers/gpu/drm/amd/include/amd_shared.h +++ b/drivers/gpu/drm/amd/include/amd_shared.h @@ -344,6 +344,11 @@ enum DC_DEBUG_MASK { * eDP display from ACPI _DDC method. */ DC_DISABLE_ACPI_EDID = 0x8000, + + /* + * @DC_DISABLE_HDMI_CEC: If set, disable HDMI-CEC feature in amdgpu driver. + */ + DC_DISABLE_HDMI_CEC = 0x10000, }; enum amd_dpm_forced_level; -- 2.34.1
