From patchwork Wed Oct 21 13:52:09 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ander Conselvan de Oliveira X-Patchwork-Id: 7456851 Return-Path: X-Original-To: patchwork-intel-gfx@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id C947BBEEA4 for ; Wed, 21 Oct 2015 13:52:30 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id C80EC208B4 for ; Wed, 21 Oct 2015 13:52:25 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) by mail.kernel.org (Postfix) with ESMTP id 9C4C7208AD for ; Wed, 21 Oct 2015 13:52:24 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 241226EDD2; Wed, 21 Oct 2015 06:52:24 -0700 (PDT) X-Original-To: intel-gfx@lists.freedesktop.org Delivered-To: intel-gfx@lists.freedesktop.org Received: from mga11.intel.com (mga11.intel.com [192.55.52.93]) by gabe.freedesktop.org (Postfix) with ESMTP id 28EDC6EDD2 for ; Wed, 21 Oct 2015 06:52:22 -0700 (PDT) Received: from fmsmga003.fm.intel.com ([10.253.24.29]) by fmsmga102.fm.intel.com with ESMTP; 21 Oct 2015 06:52:21 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.17,712,1437462000"; d="scan'208";a="585336401" Received: from linux.intel.com ([10.23.219.25]) by FMSMGA003.fm.intel.com with ESMTP; 21 Oct 2015 06:52:21 -0700 Received: from localhost (aconselv-mobl3.ger.corp.intel.com [10.237.72.88]) by linux.intel.com (Postfix) with ESMTP id 99C2F6A4083; Wed, 21 Oct 2015 06:51:21 -0700 (PDT) From: Ander Conselvan de Oliveira To: intel-gfx@lists.freedesktop.org, sivakumar.thulasimani@intel.com Date: Wed, 21 Oct 2015 16:52:09 +0300 Message-Id: <1445435529-19511-1-git-send-email-ander.conselvan.de.oliveira@intel.com> X-Mailer: git-send-email 2.4.3 In-Reply-To: <5624B17B.70405@intel.com> References: <5624B17B.70405@intel.com> Cc: Ander Conselvan de Oliveira Subject: [Intel-gfx] [PATCH v2] drm/i915: Don't pass *DP around to link training functions X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" X-Spam-Status: No, score=-4.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP It just makes the code more confusing, so just reference intel_dp->DP directly. Note that this also fix a bug where the value of intel_dp->DP could be different than the last value written to the hw, due to an early return that would skip the 'intel_dp->DP = DP' line. v2: Don't preserve old DP value on failure. (Sivakumar) - Don't call drm_dp_clock_recovery_ok() twice. (Sivakumar) - Keep return type of clock recovery and channel equalization functions as void. (Ander) Signed-off-by: Ander Conselvan de Oliveira --- drivers/gpu/drm/i915/intel_dp.c | 43 +++++++++++++++++------------------------ 1 file changed, 18 insertions(+), 25 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index 8287df4..f310dab 100644 --- a/drivers/gpu/drm/i915/intel_dp.c +++ b/drivers/gpu/drm/i915/intel_dp.c @@ -3596,7 +3596,6 @@ intel_dp_set_signal_levels(struct intel_dp *intel_dp, uint32_t *DP) static bool intel_dp_set_link_train(struct intel_dp *intel_dp, - uint32_t *DP, uint8_t dp_train_pat) { struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp); @@ -3605,9 +3604,9 @@ intel_dp_set_link_train(struct intel_dp *intel_dp, uint8_t buf[sizeof(intel_dp->train_set) + 1]; int ret, len; - _intel_dp_set_link_train(intel_dp, DP, dp_train_pat); + _intel_dp_set_link_train(intel_dp, &intel_dp->DP, dp_train_pat); - I915_WRITE(intel_dp->output_reg, *DP); + I915_WRITE(intel_dp->output_reg, intel_dp->DP); POSTING_READ(intel_dp->output_reg); buf[0] = dp_train_pat; @@ -3628,17 +3627,17 @@ intel_dp_set_link_train(struct intel_dp *intel_dp, } static bool -intel_dp_reset_link_train(struct intel_dp *intel_dp, uint32_t *DP, +intel_dp_reset_link_train(struct intel_dp *intel_dp, uint8_t dp_train_pat) { if (!intel_dp->train_set_valid) memset(intel_dp->train_set, 0, sizeof(intel_dp->train_set)); - intel_dp_set_signal_levels(intel_dp, DP); - return intel_dp_set_link_train(intel_dp, DP, dp_train_pat); + intel_dp_set_signal_levels(intel_dp, &intel_dp->DP); + return intel_dp_set_link_train(intel_dp, dp_train_pat); } static bool -intel_dp_update_link_train(struct intel_dp *intel_dp, uint32_t *DP, +intel_dp_update_link_train(struct intel_dp *intel_dp, const uint8_t link_status[DP_LINK_STATUS_SIZE]) { struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp); @@ -3647,9 +3646,9 @@ intel_dp_update_link_train(struct intel_dp *intel_dp, uint32_t *DP, int ret; intel_get_adjust_train(intel_dp, link_status); - intel_dp_set_signal_levels(intel_dp, DP); + intel_dp_set_signal_levels(intel_dp, &intel_dp->DP); - I915_WRITE(intel_dp->output_reg, *DP); + I915_WRITE(intel_dp->output_reg, intel_dp->DP); POSTING_READ(intel_dp->output_reg); ret = drm_dp_dpcd_write(&intel_dp->aux, DP_TRAINING_LANE0_SET, @@ -3698,7 +3697,6 @@ intel_dp_link_training_clock_recovery(struct intel_dp *intel_dp) int i; uint8_t voltage; int voltage_tries, loop_tries; - uint32_t DP = intel_dp->DP; uint8_t link_config[2]; uint8_t link_bw, rate_select; @@ -3722,10 +3720,10 @@ intel_dp_link_training_clock_recovery(struct intel_dp *intel_dp) link_config[1] = DP_SET_ANSI_8B10B; drm_dp_dpcd_write(&intel_dp->aux, DP_DOWNSPREAD_CTRL, link_config, 2); - DP |= DP_PORT_EN; + intel_dp->DP |= DP_PORT_EN; /* clock recovery */ - if (!intel_dp_reset_link_train(intel_dp, &DP, + if (!intel_dp_reset_link_train(intel_dp, DP_TRAINING_PATTERN_1 | DP_LINK_SCRAMBLING_DISABLE)) { DRM_ERROR("failed to enable link training\n"); @@ -3757,7 +3755,7 @@ intel_dp_link_training_clock_recovery(struct intel_dp *intel_dp) DRM_DEBUG_KMS("clock recovery not ok, reset"); /* clear the flag as we are not reusing train set */ intel_dp->train_set_valid = false; - if (!intel_dp_reset_link_train(intel_dp, &DP, + if (!intel_dp_reset_link_train(intel_dp, DP_TRAINING_PATTERN_1 | DP_LINK_SCRAMBLING_DISABLE)) { DRM_ERROR("failed to enable link training\n"); @@ -3776,7 +3774,7 @@ intel_dp_link_training_clock_recovery(struct intel_dp *intel_dp) DRM_ERROR("too many full retries, give up\n"); break; } - intel_dp_reset_link_train(intel_dp, &DP, + intel_dp_reset_link_train(intel_dp, DP_TRAINING_PATTERN_1 | DP_LINK_SCRAMBLING_DISABLE); voltage_tries = 0; @@ -3795,13 +3793,11 @@ intel_dp_link_training_clock_recovery(struct intel_dp *intel_dp) voltage = intel_dp->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK; /* Update training set as requested by target */ - if (!intel_dp_update_link_train(intel_dp, &DP, link_status)) { + if (!intel_dp_update_link_train(intel_dp, link_status)) { DRM_ERROR("failed to update link training\n"); break; } } - - intel_dp->DP = DP; } static void @@ -3811,7 +3807,6 @@ intel_dp_link_training_channel_equalization(struct intel_dp *intel_dp) struct drm_device *dev = dig_port->base.base.dev; bool channel_eq = false; int tries, cr_tries; - uint32_t DP = intel_dp->DP; uint32_t training_pattern = DP_TRAINING_PATTERN_2; /* @@ -3830,7 +3825,7 @@ intel_dp_link_training_channel_equalization(struct intel_dp *intel_dp) DRM_ERROR("5.4 Gbps link rate without HBR2/TPS3 support\n"); /* channel equalization */ - if (!intel_dp_set_link_train(intel_dp, &DP, + if (!intel_dp_set_link_train(intel_dp, training_pattern | DP_LINK_SCRAMBLING_DISABLE)) { DRM_ERROR("failed to start channel equalization\n"); @@ -3859,7 +3854,7 @@ intel_dp_link_training_channel_equalization(struct intel_dp *intel_dp) intel_dp->lane_count)) { intel_dp->train_set_valid = false; intel_dp_link_training_clock_recovery(intel_dp); - intel_dp_set_link_train(intel_dp, &DP, + intel_dp_set_link_train(intel_dp, training_pattern | DP_LINK_SCRAMBLING_DISABLE); cr_tries++; @@ -3876,7 +3871,7 @@ intel_dp_link_training_channel_equalization(struct intel_dp *intel_dp) if (tries > 5) { intel_dp->train_set_valid = false; intel_dp_link_training_clock_recovery(intel_dp); - intel_dp_set_link_train(intel_dp, &DP, + intel_dp_set_link_train(intel_dp, training_pattern | DP_LINK_SCRAMBLING_DISABLE); tries = 0; @@ -3885,7 +3880,7 @@ intel_dp_link_training_channel_equalization(struct intel_dp *intel_dp) } /* Update training set as requested by target */ - if (!intel_dp_update_link_train(intel_dp, &DP, link_status)) { + if (!intel_dp_update_link_train(intel_dp, link_status)) { DRM_ERROR("failed to update link training\n"); break; } @@ -3894,8 +3889,6 @@ intel_dp_link_training_channel_equalization(struct intel_dp *intel_dp) intel_dp_set_idle_link_train(intel_dp); - intel_dp->DP = DP; - if (channel_eq) { intel_dp->train_set_valid = true; DRM_DEBUG_KMS("Channel EQ done. DP Training successful\n"); @@ -3904,7 +3897,7 @@ intel_dp_link_training_channel_equalization(struct intel_dp *intel_dp) void intel_dp_stop_link_train(struct intel_dp *intel_dp) { - intel_dp_set_link_train(intel_dp, &intel_dp->DP, + intel_dp_set_link_train(intel_dp, DP_TRAINING_PATTERN_DISABLE); }