From mboxrd@z Thu Jan 1 00:00:00 1970 From: Paulo Zanoni Subject: [PATCH 1/3] drm/i915: don't send DP "idle" pattern before "normal" on HSW PORT_A Date: Tue, 29 Jan 2013 16:35:18 -0200 Message-ID: <1359484520-3577-1-git-send-email-przanoni@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from mail-ye0-f177.google.com (mail-ye0-f177.google.com [209.85.213.177]) by gabe.freedesktop.org (Postfix) with ESMTP id B2128E5E04 for ; Tue, 29 Jan 2013 10:35:39 -0800 (PST) Received: by mail-ye0-f177.google.com with SMTP id m14so117584yen.22 for ; Tue, 29 Jan 2013 10:35:39 -0800 (PST) List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: intel-gfx-bounces+gcfxdi-intel-gfx=m.gmane.org@lists.freedesktop.org Errors-To: intel-gfx-bounces+gcfxdi-intel-gfx=m.gmane.org@lists.freedesktop.org To: intel-gfx@lists.freedesktop.org Cc: Paulo Zanoni List-Id: intel-gfx@lists.freedesktop.org From: Paulo Zanoni The DP_TP_STATUS register for PORT_A doesn't exist. Our documentation will be fixed soon, so the code does not match it for now. This solves "Timed out waiting for DP idle patterns" and "unclaimed register" messages on eDP. V1: Was called "drm/i915: don't read DP_TP_STATUS(PORT_A)" V2: Was called "drm/i915: don't send DP idle pattern before normal pattern on HSW" V3: Only change the code that touches PORT_A. Signed-off-by: Paulo Zanoni --- drivers/gpu/drm/i915/intel_dp.c | 16 ++++++++++------ 1 file changed, 10 insertions(+), 6 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index 51fd797..1b76b04 100644 --- a/drivers/gpu/drm/i915/intel_dp.c +++ b/drivers/gpu/drm/i915/intel_dp.c @@ -1785,14 +1785,18 @@ intel_dp_set_link_train(struct intel_dp *intel_dp, temp &= ~DP_TP_CTL_LINK_TRAIN_MASK; switch (dp_train_pat & DP_TRAINING_PATTERN_MASK) { case DP_TRAINING_PATTERN_DISABLE: - temp |= DP_TP_CTL_LINK_TRAIN_IDLE; - I915_WRITE(DP_TP_CTL(port), temp); - if (wait_for((I915_READ(DP_TP_STATUS(port)) & - DP_TP_STATUS_IDLE_DONE), 1)) - DRM_ERROR("Timed out waiting for DP idle patterns\n"); + if (port != PORT_A) { + temp |= DP_TP_CTL_LINK_TRAIN_IDLE; + I915_WRITE(DP_TP_CTL(port), temp); + + if (wait_for((I915_READ(DP_TP_STATUS(port)) & + DP_TP_STATUS_IDLE_DONE), 1)) + DRM_ERROR("Timed out waiting for DP idle patterns\n"); + + temp &= ~DP_TP_CTL_LINK_TRAIN_MASK; + } - temp &= ~DP_TP_CTL_LINK_TRAIN_MASK; temp |= DP_TP_CTL_LINK_TRAIN_NORMAL; break; -- 1.7.10.4