From b2f19d1a1d7b262cf5fbe6033776afcf6d1ab526 Mon Sep 17 00:00:00 2001 From: Paulo Zanoni Date: Thu, 19 Dec 2013 14:29:44 -0200 Subject: [PATCH] drm/i915: set the backlight panel delays registers to 1 Because we already do the wait in software: see ironlake_wait_backlight_on and ironlake_edp_wait_backlight_off. For the "backlight on" delay, even BSpec says we need to program 0x1 to PP_ON_DELAYS 12:0. For the "backlight off" delay, if we don't do the same thing, when we call ironlake_wait_panel_off we'll end up waiting for the it again. On my machine the off delay is 200ms, so we save this amount of time whenever we disable the panel (e.g, suspend). Signed-off-by: Paulo Zanoni Reviewed-by: Jesse Barnes Signed-off-by: Daniel Vetter --- drivers/gpu/drm/i915/intel_dp.c | 13 ++++++++++--- 1 file changed, 10 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index 2a1055db84c..b60bc384c29 100644 --- a/drivers/gpu/drm/i915/intel_dp.c +++ b/drivers/gpu/drm/i915/intel_dp.c @@ -3530,10 +3530,17 @@ intel_dp_init_panel_power_sequencer_registers(struct drm_device *dev, pp_div_reg = VLV_PIPE_PP_DIVISOR(pipe); } - /* And finally store the new values in the power sequencer. */ + /* + * And finally store the new values in the power sequencer. The + * backlight delays are set to 1 because we do manual waits on them. For + * T8, even BSpec recommends doing it. For T9, if we don't do this, + * we'll end up waiting for the backlight off delay twice: once when we + * do the manual sleep, and once when we disable the panel and wait for + * the PP_STATUS bit to become zero. + */ pp_on = (seq->t1_t3 << PANEL_POWER_UP_DELAY_SHIFT) | - (seq->t8 << PANEL_LIGHT_ON_DELAY_SHIFT); - pp_off = (seq->t9 << PANEL_LIGHT_OFF_DELAY_SHIFT) | + (1 << PANEL_LIGHT_ON_DELAY_SHIFT); + pp_off = (1 << PANEL_LIGHT_OFF_DELAY_SHIFT) | (seq->t10 << PANEL_POWER_DOWN_DELAY_SHIFT); /* Compute the divisor for the pp clock, simply match the Bspec * formula. */ -- 2.46.0