3.16.54-rc1 review patch. If anyone has any objections, please let me know.
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From: Manasi Navare manasi.d.navare@intel.com
commit cbacf02e7796fea02e5c6e46c90ed7cbe9e6f2c0 upstream.
Kernel stores the time in jiffies at which the eDP panel is turned off. This should be obtained after the panel is off (after the wait_panel_off). When we next attempt to turn the panel on, we use the difference between the timestamp at which we want to turn the panel on and timestamp at which panel was turned off to ensure that this is equal to panel power cycle delay and if not we wait for the remaining time. Not waiting for the panel power cycle delay can cause the panel to not turn on giving rise to AUX timeouts for the attempted AUX transactions.
v2: * Separate lines for bugzilla (Jani Nikula) * Suggested by tag (Daniel Vetter)
Cc: Daniel Vetter daniel.vetter@ffwll.ch Cc: Jani Nikula jani.nikula@linux.intel.com Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=101518 Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=101144 Suggested-by: Daniel Vetter daniel.vetter@ffwll.ch Signed-off-by: Manasi Navare manasi.d.navare@intel.com Reviewed-by: Daniel Vetter daniel.vetter@ffwll.ch Reviewed-by: Jani Nikula jani.nikula@linux.intel.com Signed-off-by: Jani Nikula jani.nikula@intel.com Link: https://patchwork.freedesktop.org/patch/msgid/1507135706-17147-1-git-send-em... [bwh: Backported to 3.16: We really do use jiffies here, and the field in struct intel_dp has a different name] Signed-off-by: Ben Hutchings ben@decadent.org.uk --- drivers/gpu/drm/i915/intel_dp.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/gpu/drm/i915/intel_dp.c +++ b/drivers/gpu/drm/i915/intel_dp.c @@ -1365,8 +1365,8 @@ void intel_edp_panel_off(struct intel_dp I915_WRITE(pp_ctrl_reg, pp); POSTING_READ(pp_ctrl_reg);
- intel_dp->last_power_cycle = jiffies; wait_panel_off(intel_dp); + intel_dp->last_power_cycle = jiffies;
/* We got a reference when we enabled the VDD. */ power_domain = intel_display_port_power_domain(intel_encoder);