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charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20250108-drm-dp-msm-add-lttpr-transparent-mode-set-v4-1-918949bc2e3a@linaro.org> References: <20250108-drm-dp-msm-add-lttpr-transparent-mode-set-v4-0-918949bc2e3a@linaro.org> In-Reply-To: <20250108-drm-dp-msm-add-lttpr-transparent-mode-set-v4-0-918949bc2e3a@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 , Johan Hovold X-Mailer: b4 0.15-dev-dedf8 X-Developer-Signature: v=1; a=openpgp-sha256; l=4373; i=abel.vesa@linaro.org; h=from:subject:message-id; bh=hQr/IAsgI391eMqAJ/TFfPR5pzoBg71o+SfYOehGuXo=; b=owEBbQKS/ZANAwAKARtfRMkAlRVWAcsmYgBnfoxc1Tokb8M+VMMDW1j0rqVaD8jJ1LEA0bvc3 9bB3X1npsGJAjMEAAEKAB0WIQRO8+4RTnqPKsqn0bgbX0TJAJUVVgUCZ36MXAAKCRAbX0TJAJUV Vj8MD/9mF1N+AQ0FRE4H9Xg7TXqo3McbsRtCf7si0ZpOt7ze90eWbuEii7Dc/ThErOHA5jI9By+ QuRcu9XJH9msZIDKlvFhl2zqTjxYFzu6JXTniUreJZQSgJLFoMKli88oYIDW9iiszIGP61Hri/h ri4s86DL8DLaoLtLn14nrgGwypGy0NAzCImgX46Iit6MqD12XFnK6gS4NqHVx5cpN8lTfHpweGt aViYrMxF7oxe4+zusH4OXtVyckGUnXxLyY6q55x1tDXRiZty17Nr4xnFpyNNQ7HH6oJcvh83ZHZ rO13MvjyDK+4st6XxUsansLCP54YUl3JB3OuHPAxjdvyUBGD74CkUP+2efjq4Xw5N4E1EHibsG8 82Umkwl1EVBjhQyezcWALqxadrQrRcVxmaArM0hoEdM7rhkrCbSQkXluUeBFLgGNpBsRTkQcnXP dLk7dBL9XW955AxT1H1sapcj/b5tLvjwxUkWiq93CA9tJ82RPrMH6hS+qmekUlhqYP+6FoshiUb UznOay6J6WDxjyDIZwNeyS2Z8xPEOoHYoW1GRgaCetzJml8MxpK8kWfIXHj0ezVOr7GvErHlWLY gIo/tf9Vw9dVtrwKNWOlhnLpHfuxrb6+v62zFpkXRP8ra8KSudsu9ZY+ZMzSE8J5Gu/eC4Fh3RB U33EKNfD8tibPTA== X-Developer-Key: i=abel.vesa@linaro.org; a=openpgp; fpr=6AFF162D57F4223A8770EF5AF7BF214136F41FAE According to the DisplayPort standard, LTTPRs have two operating modes: - non-transparent - it replies to DPCD LTTPR field specific AUX requests, while passes through all other AUX requests - transparent - it passes through all AUX requests. Switching between this two modes is done by the DPTX by issuing an AUX write to the DPCD PHY_REPEATER_MODE register. Add a generic helper that allows switching between these modes. Also add a generic wrapper for the helper that handles the explicit disabling of non-transparent mode and its disable->enable sequence mentioned in the DP Standard v2.0 section 3.6.6.1. Do this in order to move this handling out of the vendor specific driver implementation into the generic framework. Tested-by: Johan Hovold Reviewed-by: Dmitry Baryshkov Reviewed-by: Johan Hovold Signed-off-by: Abel Vesa Reviewed-by: Abhinav Kumar --- drivers/gpu/drm/display/drm_dp_helper.c | 62 +++++++++++++++++++++++++++++= ++++ include/drm/display/drm_dp_helper.h | 2 ++ 2 files changed, 64 insertions(+) diff --git a/drivers/gpu/drm/display/drm_dp_helper.c b/drivers/gpu/drm/disp= lay/drm_dp_helper.c index da3c8521a7fa7d3c9761377363cdd4b44ab1106e..fa7eff94d408718a1762834597f= 0cd51376d2596 100644 --- a/drivers/gpu/drm/display/drm_dp_helper.c +++ b/drivers/gpu/drm/display/drm_dp_helper.c @@ -2817,6 +2817,68 @@ int drm_dp_lttpr_max_link_rate(const u8 caps[DP_LTTP= R_COMMON_CAP_SIZE]) } EXPORT_SYMBOL(drm_dp_lttpr_max_link_rate); =20 +/** + * drm_dp_lttpr_set_transparent_mode - set the LTTPR in transparent mode + * @aux: DisplayPort AUX channel + * @enable: Enable or disable transparent mode + * + * Returns 0 on success or a negative error code on failure. + */ +int drm_dp_lttpr_set_transparent_mode(struct drm_dp_aux *aux, bool enable) +{ + u8 val =3D enable ? DP_PHY_REPEATER_MODE_TRANSPARENT : + DP_PHY_REPEATER_MODE_NON_TRANSPARENT; + int ret =3D drm_dp_dpcd_writeb(aux, DP_PHY_REPEATER_MODE, val); + + if (ret < 0) + return ret; + + return (ret =3D=3D 1) ? 0 : -EIO; +} +EXPORT_SYMBOL(drm_dp_lttpr_set_transparent_mode); + +/** + * drm_dp_lttpr_init - init LTTPR transparency mode according to DP standa= rd + * + * @aux: DisplayPort AUX channel + * @lttpr_count: Number of LTTPRs. Between 0 and 8, according to DP standa= rd. + * Negative error code for any non-valid number. + * See drm_dp_lttpr_count(). + * + * Returns 0 on success or a negative error code on failure. + */ +int drm_dp_lttpr_init(struct drm_dp_aux *aux, int lttpr_count) +{ + int ret; + + if (!lttpr_count) + return 0; + + /* + * 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. + */ + ret =3D drm_dp_lttpr_set_transparent_mode(aux, true); + if (ret) + return ret; + + if (lttpr_count < 0) + return -ENODEV; + + if (drm_dp_lttpr_set_transparent_mode(aux, false)) { + /* + * Roll-back to transparent mode if setting non-transparent + * mode has failed + */ + drm_dp_lttpr_set_transparent_mode(aux, true); + return -EINVAL; + } + + return 0; +} +EXPORT_SYMBOL(drm_dp_lttpr_init); + /** * drm_dp_lttpr_max_lane_count - get the maximum lane count supported by a= ll LTTPRs * @caps: LTTPR common capabilities diff --git a/include/drm/display/drm_dp_helper.h b/include/drm/display/drm_= dp_helper.h index 8f4054a560396a43750570a8c2e95624039ab8ad..3311df3b58255cf0620391d0948= ccf6b569a8a34 100644 --- a/include/drm/display/drm_dp_helper.h +++ b/include/drm/display/drm_dp_helper.h @@ -630,6 +630,8 @@ int drm_dp_read_lttpr_phy_caps(struct drm_dp_aux *aux, u8 caps[DP_LTTPR_PHY_CAP_SIZE]); int drm_dp_lttpr_count(const u8 cap[DP_LTTPR_COMMON_CAP_SIZE]); int drm_dp_lttpr_max_link_rate(const u8 caps[DP_LTTPR_COMMON_CAP_SIZE]); +int drm_dp_lttpr_set_transparent_mode(struct drm_dp_aux *aux, bool enable); +int drm_dp_lttpr_init(struct drm_dp_aux *aux, int lttpr_count); int drm_dp_lttpr_max_lane_count(const u8 caps[DP_LTTPR_COMMON_CAP_SIZE]); bool drm_dp_lttpr_voltage_swing_level_3_supported(const u8 caps[DP_LTTPR_P= HY_CAP_SIZE]); bool drm_dp_lttpr_pre_emphasis_level_3_supported(const u8 caps[DP_LTTPR_PH= Y_CAP_SIZE]); --=20 2.34.1