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Mon, 06 Jan 2025 04:45:52 -0800 (PST) Received: from linaro.org ([86.121.162.10]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-43656b4274csm603466965e9.38.2025.01.06.04.45.49 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 06 Jan 2025 04:45:51 -0800 (PST) Date: Mon, 6 Jan 2025 14:45:48 +0200 From: Abel Vesa To: Dmitry Baryshkov Cc: Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Karol Herbst , Lyude Paul , Danilo Krummrich , Jani Nikula , Rodrigo Vivi , Joonas Lahtinen , Tvrtko Ursulin , Rob Clark , Abhinav Kumar , Sean Paul , Marijn Suijten , Bjorn Andersson , Konrad Dybcio , Johan Hovold , dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, nouveau@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, intel-xe@lists.freedesktop.org, linux-arm-msm@vger.kernel.org, freedreno@lists.freedesktop.org, Imre Deak Subject: Re: [PATCH v3 3/4] drm/i915/dp: Use the generic helper to control LTTPR transparent mode Message-ID: References: <20250103-drm-dp-msm-add-lttpr-transparent-mode-set-v3-0-5c367f4b0763@linaro.org> <20250103-drm-dp-msm-add-lttpr-transparent-mode-set-v3-3-5c367f4b0763@linaro.org> <3p3wgzhtptjexplxrluod6sk36xeltpoh4hxg2yagssw7nh7hj@ikc4rssp6zej> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <3p3wgzhtptjexplxrluod6sk36xeltpoh4hxg2yagssw7nh7hj@ikc4rssp6zej> X-BeenThere: intel-xe@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel Xe graphics driver List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-xe-bounces@lists.freedesktop.org Sender: "Intel-xe" On 25-01-03 20:09:42, Dmitry Baryshkov wrote: > On Fri, Jan 03, 2025 at 02:58:17PM +0200, Abel Vesa wrote: > > LTTPRs operating modes are defined by the DisplayPort standard and the > > generic framework now provides a helper to switch between them, which > > is handling the explicit disabling of non-transparent mode and its > > disable->enable sequence mentioned in the DP Standard v2.0 section > > 3.6.6.1. > > > > So use the new drm generic helper instead as it makes the code a bit > > cleaner. > > > > Acked-by: Imre Deak > > Signed-off-by: Abel Vesa > > --- > > .../gpu/drm/i915/display/intel_dp_link_training.c | 24 +++++----------------- > > 1 file changed, 5 insertions(+), 19 deletions(-) > > > > diff --git a/drivers/gpu/drm/i915/display/intel_dp_link_training.c b/drivers/gpu/drm/i915/display/intel_dp_link_training.c > > index 8b1977cfec503c70f07af716ee2c00e7605c6adf..c5bad311edf7b9a5cebb633b9e9692bae397f9ed 100644 > > --- a/drivers/gpu/drm/i915/display/intel_dp_link_training.c > > +++ b/drivers/gpu/drm/i915/display/intel_dp_link_training.c > > @@ -119,9 +119,6 @@ intel_dp_set_lttpr_transparent_mode(struct intel_dp *intel_dp, bool enable) > > u8 val = enable ? DP_PHY_REPEATER_MODE_TRANSPARENT : > > DP_PHY_REPEATER_MODE_NON_TRANSPARENT; > > > > - if (drm_dp_dpcd_write(&intel_dp->aux, DP_PHY_REPEATER_MODE, &val, 1) != 1) > > - return false; > > - > > intel_dp->lttpr_common_caps[DP_PHY_REPEATER_MODE - > > DP_LT_TUNABLE_PHY_REPEATER_FIELD_DATA_STRUCTURE_REV] = val; > > > > @@ -146,6 +143,7 @@ static bool intel_dp_lttpr_transparent_mode_enabled(struct intel_dp *intel_dp) > > static int intel_dp_init_lttpr_phys(struct intel_dp *intel_dp, const u8 dpcd[DP_RECEIVER_CAP_SIZE]) > > { > > int lttpr_count; > > + int ret; > > > > if (!intel_dp_read_lttpr_common_caps(intel_dp, dpcd)) > > return 0; > > @@ -172,22 +170,8 @@ static int intel_dp_init_lttpr_phys(struct intel_dp *intel_dp, const u8 dpcd[DP_ > > return lttpr_count; > > } > > > > - /* > > - * See DP Standard v2.0 3.6.6.1. about the explicit disabling of > > - * non-transparent mode and the disable->enable non-transparent mode > > - * sequence. > > - */ > > - intel_dp_set_lttpr_transparent_mode(intel_dp, true); > > - > > - /* > > - * In case of unsupported number of LTTPRs or failing to switch to > > - * non-transparent mode fall-back to transparent link training mode, > > - * still taking into account any LTTPR common lane- rate/count limits. > > - */ > > - if (lttpr_count < 0) > > - goto out_reset_lttpr_count; > > - > > - if (!intel_dp_set_lttpr_transparent_mode(intel_dp, false)) { > > + ret = drm_dp_lttpr_init(&intel_dp->aux, lttpr_count); > > + if (ret) { > > lt_dbg(intel_dp, DP_PHY_DPRX, > > "Switching to LTTPR non-transparent LT mode failed, fall-back to transparent mode\n"); > > > > @@ -196,6 +180,8 @@ static int intel_dp_init_lttpr_phys(struct intel_dp *intel_dp, const u8 dpcd[DP_ > > goto out_reset_lttpr_count; > > } > > > > + intel_dp_set_lttpr_transparent_mode(intel_dp, false); > > + > > I think the code now misses a way to update intel_dp->lttpr_common_caps > in a transparent-mode case: > intel_dp_set_lttpr_transparent_mode(intel_dp, true). It is being called if the drm_dp_lttpr_init() returns a non-zero value, but that is not part of the diff here. > > > return lttpr_count; > > > > out_reset_lttpr_count: > > > > -- > > 2.34.1 > > > > -- > With best wishes > Dmitry