From: Adrian Salido salidoa@google.com
Some displays may support Low Power modes, however, these modes may require special handling as they would usually require lower OPR content on framebuffers. Add a drm mode flag to specify display capability to support low power mode, and add a drm client cap for it. If a client doesn't support the capability, that will filter it out for the client.
Signed-off-by: Adrian Salido salidoa@google.com Signed-off-by: Ken Huang kenbshuang@google.com --- drivers/gpu/drm/drm_connector.c | 4 ++++ drivers/gpu/drm/drm_ioctl.c | 5 +++++ include/drm/drm_file.h | 7 +++++++ include/uapi/drm/drm.h | 10 ++++++++++ include/uapi/drm/drm_mode.h | 3 +++ 5 files changed, 29 insertions(+)
diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c index 717c4e7271b0..46a29b156ffa 100644 --- a/drivers/gpu/drm/drm_connector.c +++ b/drivers/gpu/drm/drm_connector.c @@ -2318,6 +2318,10 @@ drm_mode_expose_to_userspace(const struct drm_display_mode *mode, } }
+ if (!file_priv->low_power_modes_allowed && + (mode->flags & DRM_MODE_FLAG_LOW_POWER)) + return false; + return true; }
diff --git a/drivers/gpu/drm/drm_ioctl.c b/drivers/gpu/drm/drm_ioctl.c index 789ee65ac1f5..e7e025698b3b 100644 --- a/drivers/gpu/drm/drm_ioctl.c +++ b/drivers/gpu/drm/drm_ioctl.c @@ -362,6 +362,11 @@ drm_setclientcap(struct drm_device *dev, void *data, struct drm_file *file_priv) return -EINVAL; file_priv->writeback_connectors = req->value; break; + case DRM_CLIENT_CAP_LOW_POWER_MODES: + if (req->value > 1) + return -EINVAL; + file_priv->low_power_modes_allowed = req->value; + break; default: return -EINVAL; } diff --git a/include/drm/drm_file.h b/include/drm/drm_file.h index 716990bace10..2fa66c32f066 100644 --- a/include/drm/drm_file.h +++ b/include/drm/drm_file.h @@ -212,6 +212,13 @@ struct drm_file { */ bool was_master;
+ /** + * @low_power_modes_allowed: + * + * True if the client understands how to work with low power modes + */ + bool low_power_modes_allowed; + /** * @is_master: * diff --git a/include/uapi/drm/drm.h b/include/uapi/drm/drm.h index 808b48a93330..12f39a628bb5 100644 --- a/include/uapi/drm/drm.h +++ b/include/uapi/drm/drm.h @@ -698,6 +698,16 @@ struct drm_get_cap { */ #define DRM_CLIENT_CAP_WRITEBACK_CONNECTORS 5
+/** + * DRM_CLIENT_CAP_LOW_POWER_MODES + * + * If set to 1, the DRM core will expose modes that support Lower Power at the + * potential cost of reduced fidelity. Special care must be taken by clients + * that work with these modes, (ex. framebuffer contents are expected to + * have reduced OPRs) + */ +#define DRM_CLIENT_CAP_LOW_POWER_MODES 6 + /** DRM_IOCTL_SET_CLIENT_CAP ioctl argument type */ struct drm_set_client_cap { __u64 capability; diff --git a/include/uapi/drm/drm_mode.h b/include/uapi/drm/drm_mode.h index 863eda048265..71137280b1e6 100644 --- a/include/uapi/drm/drm_mode.h +++ b/include/uapi/drm/drm_mode.h @@ -124,6 +124,8 @@ extern "C" { #define DRM_MODE_FLAG_PIC_AR_256_135 \ (DRM_MODE_PICTURE_ASPECT_256_135<<19)
+#define DRM_MODE_FLAG_LOW_POWER (1<<23) + #define DRM_MODE_FLAG_ALL (DRM_MODE_FLAG_PHSYNC | \ DRM_MODE_FLAG_NHSYNC | \ DRM_MODE_FLAG_PVSYNC | \ @@ -136,6 +138,7 @@ extern "C" { DRM_MODE_FLAG_HSKEW | \ DRM_MODE_FLAG_DBLCLK | \ DRM_MODE_FLAG_CLKDIV2 | \ + DRM_MODE_FLAG_LOW_POWER | \ DRM_MODE_FLAG_3D_MASK)
/* DPMS flags */