From 9504a89247595b6c066c68aea0c34af1fc78d021 Mon Sep 17 00:00:00 2001 From: Lyude Date: Tue, 21 Jun 2016 17:03:42 -0400 Subject: drm/i915/vlv: Reset the ADPA in vlv_display_power_well_init() MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit While VGA hotplugging worked(ish) before, it looks like that was mainly because we'd unintentionally enable it in valleyview_crt_detect_hotplug() when we did a force trigger. This doesn't work reliably enough because whenever the display powerwell on vlv gets disabled, the values set in VLV_ADPA get cleared and consequently VGA hotplugging gets disabled. This causes bugs such as one we found on an Intel NUC, where doing the following sequence of hotplugs: - Disconnect all monitors - Connect VGA - Disconnect VGA - Connect HDMI Would result in VGA hotplugging becoming disabled, due to the powerwells getting toggled in the process of connecting HDMI. Changes since v3: - Expose intel_crt_reset() through intel_drv.h and call that in vlv_display_power_well_init() instead of encoder->base.funcs->reset(&encoder->base); Changes since v2: - Use intel_encoder structs instead of drm_encoder structs Changes since v1: - Instead of handling the register writes ourself, we just reuse intel_crt_detect() - Instead of resetting the ADPA during display IRQ installation, we now reset them in vlv_display_power_well_init() Cc: stable@vger.kernel.org Acked-by: Daniel Vetter Signed-off-by: Lyude Reviewed-by: Ville Syrjälä [danvet: Rebase over dev_priv/drm_device embedding.] Signed-off-by: Daniel Vetter --- drivers/gpu/drm/i915/intel_crt.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers/gpu/drm/i915/intel_crt.c') diff --git a/drivers/gpu/drm/i915/intel_crt.c b/drivers/gpu/drm/i915/intel_crt.c index 9cd8829..d172930a 100644 --- a/drivers/gpu/drm/i915/intel_crt.c +++ b/drivers/gpu/drm/i915/intel_crt.c @@ -717,7 +717,7 @@ static int intel_crt_set_property(struct drm_connector *connector, return 0; } -static void intel_crt_reset(struct drm_encoder *encoder) +void intel_crt_reset(struct drm_encoder *encoder) { struct drm_device *dev = encoder->dev; struct drm_i915_private *dev_priv = to_i915(dev); -- cgit v1.1