From f123959594c000a43b267c75695bd3ffd0748eb1 Mon Sep 17 00:00:00 2001 From: Imre Deak Date: Fri, 27 Jan 2017 11:39:20 +0200 Subject: [PATCH] drm/i915/lspcon: Remove DPCD compare based resume time workaround MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit This effectively reverts commit 489375c866c111f16cea93b2467ebe59c9022cc7 Author: Imre Deak Date: Mon Oct 24 19:33:31 2016 +0300 drm/i915/lspcon: Add workaround for resuming in PCON mode The workaround was added without considering that HPD is low during the failed AUX transfers the WA fixed. Since the previous patch we wait for HPD to get asserted. My tests also show that this happens _after_ the DPCD reads start to return correct values. This suggests that we don't need this WA any more, let's try to remove it to reduce the clutter. Cc: Shashank Sharma Cc: Jani Nikula Cc: Ville Syrjälä Cc: Daniel Vetter Signed-off-by: Imre Deak Reviewed-by: Shashank Sharma Link: http://patchwork.freedesktop.org/patch/msgid/1485509961-9010-4-git-send-email-imre.deak@intel.com --- drivers/gpu/drm/i915/intel_drv.h | 1 - drivers/gpu/drm/i915/intel_lspcon.c | 17 ++--------------- 2 files changed, 2 insertions(+), 16 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h index 424f7ea04b68..973d7b6a7d5c 100644 --- a/drivers/gpu/drm/i915/intel_drv.h +++ b/drivers/gpu/drm/i915/intel_drv.h @@ -1002,7 +1002,6 @@ struct intel_dp { struct intel_lspcon { bool active; enum drm_lspcon_mode mode; - bool desc_valid; }; struct intel_digital_port { diff --git a/drivers/gpu/drm/i915/intel_lspcon.c b/drivers/gpu/drm/i915/intel_lspcon.c index c300647ef604..71cbe9c08932 100644 --- a/drivers/gpu/drm/i915/intel_lspcon.c +++ b/drivers/gpu/drm/i915/intel_lspcon.c @@ -162,21 +162,8 @@ static void lspcon_resume_in_pcon_wa(struct intel_lspcon *lspcon) struct drm_i915_private *dev_priv = to_i915(dig_port->base.base.dev); unsigned long start = jiffies; - if (!lspcon->desc_valid) - return; - while (1) { - struct intel_dp_desc desc; - - /* - * The w/a only applies in PCON mode and we don't expect any - * AUX errors. - */ - if (!__intel_dp_read_desc(intel_dp, &desc)) - return; - - if (intel_digital_port_connected(dev_priv, dig_port) && - !memcmp(&intel_dp->desc, &desc, sizeof(desc))) { + if (intel_digital_port_connected(dev_priv, dig_port)) { DRM_DEBUG_KMS("LSPCON recovering in PCON mode after %u ms\n", jiffies_to_msecs(jiffies - start)); return; @@ -253,7 +240,7 @@ bool lspcon_init(struct intel_digital_port *intel_dig_port) return false; } - lspcon->desc_valid = intel_dp_read_desc(dp); + intel_dp_read_desc(dp); DRM_DEBUG_KMS("Success: LSPCON init\n"); return true; -- 2.20.1