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Subject[PATCH 5/7] drm/i915: Make DP prepare/commit consistent with DP dpms
Date
Make sure the sequence of operations in all three functions makes
sense:

1) The backlight must be off unless the screen is running
2) The link must be running to turn the eDP panel on/off
3) The CPU eDP PLL must be running until everything is off

Signed-off-by: Keith Packard <keithp@keithp.com>
---
drivers/gpu/drm/i915/intel_dp.c | 22 +++++++++++++---------
1 files changed, 13 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index d6c6608..6be6a04 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -1234,17 +1234,18 @@ static void intel_dp_prepare(struct drm_encoder *encoder)
{
struct intel_dp *intel_dp = enc_to_intel_dp(encoder);

+ ironlake_edp_backlight_off(intel_dp);
+ ironlake_edp_panel_off(intel_dp);
+
/* Wake up the sink first */
ironlake_edp_panel_vdd_on(intel_dp);
intel_dp_sink_dpms(intel_dp, DRM_MODE_DPMS_ON);
+ intel_dp_link_down(intel_dp);
ironlake_edp_panel_vdd_off(intel_dp, false);

/* Make sure the panel is off before trying to
* change the mode
*/
- ironlake_edp_backlight_off(intel_dp);
- intel_dp_link_down(intel_dp);
- ironlake_edp_panel_off(intel_dp);
}

static void intel_dp_commit(struct drm_encoder *encoder)
@@ -1276,16 +1277,20 @@ intel_dp_dpms(struct drm_encoder *encoder, int mode)
uint32_t dp_reg = I915_READ(intel_dp->output_reg);

if (mode != DRM_MODE_DPMS_ON) {
+ ironlake_edp_backlight_off(intel_dp);
+ ironlake_edp_panel_off(intel_dp);
+
ironlake_edp_panel_vdd_on(intel_dp);
- if (is_edp(intel_dp))
- ironlake_edp_backlight_off(intel_dp);
intel_dp_sink_dpms(intel_dp, mode);
intel_dp_link_down(intel_dp);
- ironlake_edp_panel_off(intel_dp);
- if (is_edp(intel_dp) && !is_pch_edp(intel_dp))
- ironlake_edp_pll_off(encoder);
ironlake_edp_panel_vdd_off(intel_dp, false);
+
+ if (is_cpu_edp(intel_dp))
+ ironlake_edp_pll_off(encoder);
} else {
+ if (is_cpu_edp(intel_dp))
+ ironlake_edp_pll_on(encoder);
+
ironlake_edp_panel_vdd_on(intel_dp);
intel_dp_sink_dpms(intel_dp, mode);
if (!(dp_reg & DP_PORT_EN)) {
@@ -1293,7 +1298,6 @@ intel_dp_dpms(struct drm_encoder *encoder, int mode)
ironlake_edp_panel_on(intel_dp);
ironlake_edp_panel_vdd_off(intel_dp, true);
intel_dp_complete_link_train(intel_dp);
- ironlake_edp_backlight_on(intel_dp);
} else
ironlake_edp_panel_vdd_off(intel_dp, false);
ironlake_edp_backlight_on(intel_dp);
--
1.7.7


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