This is required to properly handle failing dpms calls. When making a wait in i915 interruptible, I've noticed that the dpms sequence could fail with -ERESTARTSYS because it was waiting interruptibly for flips. So from now on allow drivers to fail in their connector dpms callback.
Encoder and crtc dpms callbacks are unaffected.
Changes since v1: - Update kerneldoc for the drm helper functions.
Signed-off-by: Maarten Lankhorst maarten.lankhorst@linux.intel.com --- diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c index d5eba80dc39f..0ea8c5d476ef 100644 --- a/drivers/gpu/drm/drm_atomic_helper.c +++ b/drivers/gpu/drm/drm_atomic_helper.c @@ -1957,9 +1957,12 @@ EXPORT_SYMBOL(drm_atomic_helper_page_flip); * implementing the legacy DPMS connector interface. It computes the new desired * ->active state for the corresponding CRTC (if the connector is enabled) and * updates it. + * + * Returns: + * Returns 0 on success, negative errno numbers on failure. */ -void drm_atomic_helper_connector_dpms(struct drm_connector *connector, - int mode) +int drm_atomic_helper_connector_dpms(struct drm_connector *connector, + int mode) { struct drm_mode_config *config = &connector->dev->mode_config; struct drm_atomic_state *state; @@ -1968,6 +1971,7 @@ void drm_atomic_helper_connector_dpms(struct drm_connector *connector, struct drm_connector *tmp_connector; int ret; bool active = false; + int old_mode = connector->dpms;
if (mode != DRM_MODE_DPMS_ON) mode = DRM_MODE_DPMS_OFF; @@ -1976,18 +1980,19 @@ void drm_atomic_helper_connector_dpms(struct drm_connector *connector, crtc = connector->state->crtc;
if (!crtc) - return; + return 0;
- /* FIXME: ->dpms has no return value so can't forward the -ENOMEM. */ state = drm_atomic_state_alloc(connector->dev); if (!state) - return; + return -ENOMEM;
state->acquire_ctx = drm_modeset_legacy_acquire_ctx(crtc); retry: crtc_state = drm_atomic_get_crtc_state(state, crtc); - if (IS_ERR(crtc_state)) - return; + if (IS_ERR(crtc_state)) { + ret = PTR_ERR(crtc_state); + goto fail; + }
WARN_ON(!drm_modeset_is_locked(&config->connection_mutex));
@@ -2006,17 +2011,16 @@ retry: if (ret != 0) goto fail;
- /* Driver takes ownership of state on successful async commit. */ - return; + /* Driver takes ownership of state on successful commit. */ + return 0; fail: if (ret == -EDEADLK) goto backoff;
+ connector->dpms = old_mode; drm_atomic_state_free(state);
- WARN(1, "Driver bug: Changing ->active failed with ret=%i\n", ret); - - return; + return ret; backoff: drm_atomic_state_clear(state); drm_atomic_legacy_backoff(state); diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c index a717d18e7a97..5c11083dd186 100644 --- a/drivers/gpu/drm/drm_crtc.c +++ b/drivers/gpu/drm/drm_crtc.c @@ -4869,9 +4869,9 @@ static int drm_mode_connector_set_obj_prop(struct drm_mode_object *obj,
/* Do DPMS ourselves */ if (property == connector->dev->mode_config.dpms_property) { - if (connector->funcs->dpms) - (*connector->funcs->dpms)(connector, (int)value); ret = 0; + if (connector->funcs->dpms) + ret = (*connector->funcs->dpms)(connector, (int)value); } else if (connector->funcs->set_property) ret = connector->funcs->set_property(connector, property, value);
diff --git a/drivers/gpu/drm/drm_crtc_helper.c b/drivers/gpu/drm/drm_crtc_helper.c index d3dfb0ebbeb2..a859e192e19d 100644 --- a/drivers/gpu/drm/drm_crtc_helper.c +++ b/drivers/gpu/drm/drm_crtc_helper.c @@ -762,15 +762,18 @@ static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc) * implementing the DPMS connector attribute. It computes the new desired DPMS * state for all encoders and crtcs in the output mesh and calls the ->dpms() * callback provided by the driver appropriately. + * + * Returns: + * Always returns 0. */ -void drm_helper_connector_dpms(struct drm_connector *connector, int mode) +int drm_helper_connector_dpms(struct drm_connector *connector, int mode) { struct drm_encoder *encoder = connector->encoder; struct drm_crtc *crtc = encoder ? encoder->crtc : NULL; int old_dpms, encoder_dpms = DRM_MODE_DPMS_OFF;
if (mode == connector->dpms) - return; + return 0;
old_dpms = connector->dpms; connector->dpms = mode; @@ -802,7 +805,7 @@ void drm_helper_connector_dpms(struct drm_connector *connector, int mode) } }
- return; + return 0; } EXPORT_SYMBOL(drm_helper_connector_dpms);
diff --git a/drivers/gpu/drm/nouveau/nouveau_connector.c b/drivers/gpu/drm/nouveau/nouveau_connector.c index 3162040bc314..1f26eba245d1 100644 --- a/drivers/gpu/drm/nouveau/nouveau_connector.c +++ b/drivers/gpu/drm/nouveau/nouveau_connector.c @@ -919,7 +919,7 @@ nouveau_connector_funcs_lvds = { .force = nouveau_connector_force };
-static void +static int nouveau_connector_dp_dpms(struct drm_connector *connector, int mode) { struct nouveau_encoder *nv_encoder = NULL; @@ -938,7 +938,7 @@ nouveau_connector_dp_dpms(struct drm_connector *connector, int mode) } }
- drm_helper_connector_dpms(connector, mode); + return drm_helper_connector_dpms(connector, mode); }
static const struct drm_connector_funcs diff --git a/drivers/gpu/drm/radeon/radeon_dp_mst.c b/drivers/gpu/drm/radeon/radeon_dp_mst.c index 257b10be5cda..983afb4b856c 100644 --- a/drivers/gpu/drm/radeon/radeon_dp_mst.c +++ b/drivers/gpu/drm/radeon/radeon_dp_mst.c @@ -246,9 +246,10 @@ radeon_dp_mst_connector_destroy(struct drm_connector *connector) kfree(radeon_connector); }
-static void radeon_connector_dpms(struct drm_connector *connector, int mode) +static int radeon_connector_dpms(struct drm_connector *connector, int mode) { DRM_DEBUG_KMS("\n"); + return 0; }
static const struct drm_connector_funcs radeon_dp_mst_connector_funcs = { diff --git a/drivers/gpu/drm/tegra/dsi.c b/drivers/gpu/drm/tegra/dsi.c index ed970f622903..dc97c0b3681d 100644 --- a/drivers/gpu/drm/tegra/dsi.c +++ b/drivers/gpu/drm/tegra/dsi.c @@ -726,8 +726,9 @@ static void tegra_dsi_soft_reset(struct tegra_dsi *dsi) tegra_dsi_soft_reset(dsi->slave); }
-static void tegra_dsi_connector_dpms(struct drm_connector *connector, int mode) +static int tegra_dsi_connector_dpms(struct drm_connector *connector, int mode) { + return 0; }
static void tegra_dsi_connector_reset(struct drm_connector *connector) diff --git a/drivers/gpu/drm/tegra/hdmi.c b/drivers/gpu/drm/tegra/hdmi.c index 06ab1783bba1..fe4008a7ddba 100644 --- a/drivers/gpu/drm/tegra/hdmi.c +++ b/drivers/gpu/drm/tegra/hdmi.c @@ -772,9 +772,10 @@ static bool tegra_output_is_hdmi(struct tegra_output *output) return drm_detect_hdmi_monitor(edid); }
-static void tegra_hdmi_connector_dpms(struct drm_connector *connector, - int mode) +static int tegra_hdmi_connector_dpms(struct drm_connector *connector, + int mode) { + return 0; }
static const struct drm_connector_funcs tegra_hdmi_connector_funcs = { diff --git a/drivers/gpu/drm/tegra/rgb.c b/drivers/gpu/drm/tegra/rgb.c index 7cd833f5b5b5..9a99d213e1b1 100644 --- a/drivers/gpu/drm/tegra/rgb.c +++ b/drivers/gpu/drm/tegra/rgb.c @@ -88,9 +88,10 @@ static void tegra_dc_write_regs(struct tegra_dc *dc, tegra_dc_writel(dc, table[i].value, table[i].offset); }
-static void tegra_rgb_connector_dpms(struct drm_connector *connector, - int mode) +static int tegra_rgb_connector_dpms(struct drm_connector *connector, + int mode) { + return 0; }
static const struct drm_connector_funcs tegra_rgb_connector_funcs = { diff --git a/drivers/gpu/drm/tegra/sor.c b/drivers/gpu/drm/tegra/sor.c index 7591d8901f9a..ee8ad0d4a0f2 100644 --- a/drivers/gpu/drm/tegra/sor.c +++ b/drivers/gpu/drm/tegra/sor.c @@ -866,8 +866,9 @@ static void tegra_sor_debugfs_exit(struct tegra_sor *sor) sor->debugfs_files = NULL; }
-static void tegra_sor_connector_dpms(struct drm_connector *connector, int mode) +static int tegra_sor_connector_dpms(struct drm_connector *connector, int mode) { + return 0; }
static enum drm_connector_status diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c b/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c index 07cda8cbbddb..2adc11bc0920 100644 --- a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c @@ -1808,8 +1808,9 @@ void vmw_du_crtc_gamma_set(struct drm_crtc *crtc, } }
-void vmw_du_connector_dpms(struct drm_connector *connector, int mode) +int vmw_du_connector_dpms(struct drm_connector *connector, int mode) { + return 0; }
void vmw_du_connector_save(struct drm_connector *connector) diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.h b/drivers/gpu/drm/vmwgfx/vmwgfx_kms.h index 8d038c36bd57..f1a324cfb4c3 100644 --- a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.h +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_kms.h @@ -133,7 +133,7 @@ void vmw_du_crtc_gamma_set(struct drm_crtc *crtc, int vmw_du_crtc_cursor_set(struct drm_crtc *crtc, struct drm_file *file_priv, uint32_t handle, uint32_t width, uint32_t height); int vmw_du_crtc_cursor_move(struct drm_crtc *crtc, int x, int y); -void vmw_du_connector_dpms(struct drm_connector *connector, int mode); +int vmw_du_connector_dpms(struct drm_connector *connector, int mode); void vmw_du_connector_save(struct drm_connector *connector); void vmw_du_connector_restore(struct drm_connector *connector); enum drm_connector_status diff --git a/include/drm/drm_atomic_helper.h b/include/drm/drm_atomic_helper.h index cc1fee8a12d0..11266d147a29 100644 --- a/include/drm/drm_atomic_helper.h +++ b/include/drm/drm_atomic_helper.h @@ -87,8 +87,8 @@ int drm_atomic_helper_page_flip(struct drm_crtc *crtc, struct drm_framebuffer *fb, struct drm_pending_vblank_event *event, uint32_t flags); -void drm_atomic_helper_connector_dpms(struct drm_connector *connector, - int mode); +int drm_atomic_helper_connector_dpms(struct drm_connector *connector, + int mode);
/* default implementations for state handling */ void drm_atomic_helper_crtc_reset(struct drm_crtc *crtc); diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h index 57ca8cc383a6..8159a0627b6b 100644 --- a/include/drm/drm_crtc.h +++ b/include/drm/drm_crtc.h @@ -525,7 +525,7 @@ struct drm_connector_state { * etc. */ struct drm_connector_funcs { - void (*dpms)(struct drm_connector *connector, int mode); + int (*dpms)(struct drm_connector *connector, int mode); void (*save)(struct drm_connector *connector); void (*restore)(struct drm_connector *connector); void (*reset)(struct drm_connector *connector); diff --git a/include/drm/drm_crtc_helper.h b/include/drm/drm_crtc_helper.h index c8fc187061de..4562bd12bb4a 100644 --- a/include/drm/drm_crtc_helper.h +++ b/include/drm/drm_crtc_helper.h @@ -187,7 +187,7 @@ extern bool drm_crtc_helper_set_mode(struct drm_crtc *crtc, extern bool drm_helper_crtc_in_use(struct drm_crtc *crtc); extern bool drm_helper_encoder_in_use(struct drm_encoder *encoder);
-extern void drm_helper_connector_dpms(struct drm_connector *connector, int mode); +extern int drm_helper_connector_dpms(struct drm_connector *connector, int mode);
extern void drm_helper_move_panel_connectors_to_head(struct drm_device *);