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charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20241211-drm-dp-msm-add-lttpr-transparent-mode-set-v2-3-d5906ed38b28@linaro.org> References: <20241211-drm-dp-msm-add-lttpr-transparent-mode-set-v2-0-d5906ed38b28@linaro.org> In-Reply-To: <20241211-drm-dp-msm-add-lttpr-transparent-mode-set-v2-0-d5906ed38b28@linaro.org> To: 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 , Dmitry Baryshkov , Sean Paul , Marijn Suijten Cc: 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, Abel Vesa X-Mailer: b4 0.15-dev-dedf8 X-Developer-Signature: v=1; a=openpgp-sha256; l=2833; i=abel.vesa@linaro.org; h=from:subject:message-id; bh=FUHQ0aZF7afF+UvlaYS5mgy99uzsyCnBxlW5sEXNdd0=; b=owEBbQKS/ZANAwAKARtfRMkAlRVWAcsmYgBnWY3YkQdfhiXDi2nEaZKtbiUO42rg8nSNvrOGf vp9Mu3EPd+JAjMEAAEKAB0WIQRO8+4RTnqPKsqn0bgbX0TJAJUVVgUCZ1mN2AAKCRAbX0TJAJUV Vg87D/43/OKkPUILxMJlyOSUMimtMbjoDzsdQc5crRYcDXSJu5NcQncQ8PAkOa7LH0sqyI1kJCp 3oBzSWaXT6m1lP2ZypArLC0oQUS9PbNz4UXqfMo+VvjiRQTTupMp+I38N3HJnrGGuafEW7EErmg PgP+3yfy89jne16xB09+sgMhx42IRpiT7yuNmJOXdQrZA5tfN0J+lyO8QKzaAZig+Ikfrwo7Him Ge69uNOlioLXwF8oaHH3AqWvOo4AZpJ695TYlonf0DLPo+6dlMcpm53wUToOqR5o4rIy2slxLnX kSwo94HXl7gTIb6nKElFhwvHrO8RnrrVZ2SUHRdbGlaPNb3nPX4emI8RhfIQMIhi0eBmDfTCdfZ Q13MXJPh+laLylGeqX9nRY+DQp0qZq2y4W0PNX6YbdiYMFeR5qBqXwWRJC1QNf1vY4r5vjN/63f B6yxKvjIcYeVQRQMuJMYAZjQc1ZQKJ5RqVHjzIvd0OhTJOFjMX1D1q95PMyqkTiVpbqxL2lgvnX UPO5o0ptgMPA3ZrI82TxcdqRFm0x/zBUQysMxvnZinLDHIZujfKJzrvIthTIWmznXHWzsXNeFF+ 0JYwupVl8Jbk4uwlyXpakXEHr2MhI5Nfzd5+Q2rl9g7Qleh1hzWfDSmyl+W5expId72lTLbCkMI cvs3aaFaMFtSd5A== X-Developer-Key: i=abel.vesa@linaro.org; a=openpgp; fpr=6AFF162D57F4223A8770EF5AF7BF214136F41FAE 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. 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/driver= s/gpu/drm/i915/display/intel_dp_link_training.c index ea9b4730a176f16af56810248d1b66b9d97c5fd0..6982e6e9bcc8ab5f689ba1b02df= 334aa352a430c 100644 --- a/drivers/gpu/drm/i915/display/intel_dp_link_training.c +++ b/drivers/gpu/drm/i915/display/intel_dp_link_training.c @@ -118,9 +118,6 @@ intel_dp_set_lttpr_transparent_mode(struct intel_dp *in= tel_dp, bool enable) u8 val =3D enable ? DP_PHY_REPEATER_MODE_TRANSPARENT : DP_PHY_REPEATER_MODE_NON_TRANSPARENT; =20 - if (drm_dp_dpcd_write(&intel_dp->aux, DP_PHY_REPEATER_MODE, &val, 1) !=3D= 1) - return false; - intel_dp->lttpr_common_caps[DP_PHY_REPEATER_MODE - DP_LT_TUNABLE_PHY_REPEATER_FIELD_DATA_STRUCTURE_REV] =3D val; =20 @@ -145,6 +142,7 @@ static bool intel_dp_lttpr_transparent_mode_enabled(str= uct intel_dp *intel_dp) static int intel_dp_init_lttpr_phys(struct intel_dp *intel_dp, const u8 dp= cd[DP_RECEIVER_CAP_SIZE]) { int lttpr_count; + int ret; =20 if (!intel_dp_read_lttpr_common_caps(intel_dp, dpcd)) return 0; @@ -171,22 +169,8 @@ static int intel_dp_init_lttpr_phys(struct intel_dp *i= ntel_dp, const u8 dpcd[DP_ return lttpr_count; } =20 - /* - * 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 =3D 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"); =20 @@ -195,6 +179,8 @@ static int intel_dp_init_lttpr_phys(struct intel_dp *in= tel_dp, const u8 dpcd[DP_ goto out_reset_lttpr_count; } =20 + intel_dp_set_lttpr_transparent_mode(intel_dp, false); + return lttpr_count; =20 out_reset_lttpr_count: --=20 2.34.1