diff options
Diffstat (limited to 'drivers/gpu/drm/i915/intel_dp.c')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_dp.c | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index 52fda950fd2a..075170d1844f 100644 --- a/drivers/gpu/drm/i915/intel_dp.c +++ b/drivers/gpu/drm/i915/intel_dp.c @@ -28,6 +28,8 @@ #include <linux/i2c.h> #include <linux/slab.h> #include <linux/export.h> +#include <linux/notifier.h> +#include <linux/reboot.h> #include <drm/drmP.h> #include <drm/drm_crtc.h> #include <drm/drm_crtc_helper.h> @@ -336,6 +338,37 @@ static u32 _pp_stat_reg(struct intel_dp *intel_dp) return VLV_PIPE_PP_STATUS(vlv_power_sequencer_pipe(intel_dp)); } +/* Reboot notifier handler to shutdown panel power to guarantee T12 timing + This function only applicable when panel PM state is not to be tracked */ +static int edp_notify_handler(struct notifier_block *this, unsigned long code, + void *unused) +{ + struct intel_dp *intel_dp = container_of(this, typeof(* intel_dp), + edp_notifier); + struct drm_device *dev = intel_dp_to_dev(intel_dp); + struct drm_i915_private *dev_priv = dev->dev_private; + u32 pp_div; + u32 pp_ctrl_reg, pp_div_reg; + enum pipe pipe = vlv_power_sequencer_pipe(intel_dp); + + if (!is_edp(intel_dp) || code != SYS_RESTART) + return 0; + + if (IS_VALLEYVIEW(dev)) { + pp_ctrl_reg = VLV_PIPE_PP_CONTROL(pipe); + pp_div_reg = VLV_PIPE_PP_DIVISOR(pipe); + pp_div = I915_READ(pp_div_reg); + pp_div &= PP_REFERENCE_DIVIDER_MASK; + + /* 0x1F write to PP_DIV_REG sets max cycle delay */ + I915_WRITE(pp_div_reg, pp_div | 0x1F); + I915_WRITE(pp_ctrl_reg, PANEL_UNLOCK_REGS | PANEL_POWER_OFF); + msleep(intel_dp->panel_power_cycle_delay); + } + + return 0; +} + static bool edp_have_panel_power(struct intel_dp *intel_dp) { struct drm_device *dev = intel_dp_to_dev(intel_dp); @@ -3707,6 +3740,10 @@ void intel_dp_encoder_destroy(struct drm_encoder *encoder) drm_modeset_lock(&dev->mode_config.connection_mutex, NULL); edp_panel_vdd_off_sync(intel_dp); drm_modeset_unlock(&dev->mode_config.connection_mutex); + if (intel_dp->edp_notifier.notifier_call) { + unregister_reboot_notifier(&intel_dp->edp_notifier); + intel_dp->edp_notifier.notifier_call = NULL; + } } kfree(intel_dig_port); } @@ -4184,6 +4221,11 @@ static bool intel_edp_init_connector(struct intel_dp *intel_dp, } mutex_unlock(&dev->mode_config.mutex); + if (IS_VALLEYVIEW(dev)) { + intel_dp->edp_notifier.notifier_call = edp_notify_handler; + register_reboot_notifier(&intel_dp->edp_notifier); + } + intel_panel_init(&intel_connector->panel, fixed_mode, downclock_mode); intel_panel_setup_backlight(connector); |
