From nobody Mon Feb 9 19:25:57 2026 Received: from canpmsgout11.his.huawei.com (canpmsgout11.his.huawei.com [113.46.200.226]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 65DAE2BCFC for ; Sat, 7 Feb 2026 09:56:12 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=113.46.200.226 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770458174; cv=none; b=bkwuDZVhldm0Wio+ClehHo2YM8MYkL9nilK1wJsQeLVVXvViFvgzMfLtwvlNshsF1UqpejMbX25SO6o7A0BmXzlUQxYCXPXmYA0FMnFBooULJN4SRmJhqt61pYfKO3yi2DMuR7htOUTzHlJBKwynqr3Lvxk7/ibR6bABBXhDKnc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770458174; c=relaxed/simple; bh=Ou6Y1DZZ+lujNl/dKoBWEVXJQtEl5zrZYjntNtYMI3w=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=TM6pa56QwWrV/oKmceh54oTdYcRS543MpNLquftvADx3vlV2nh0HfSObzzBpvEtPNe+I+4kS6StIHRbP/HehEFsV1cYBy0yFy5FBMO3JRXjqe9ubYJHl7e8ADArukZ63r4DleRSI2MckmPu/Yaq2kRMWFs47G6sihPAFtJ3w67Y= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com; spf=pass smtp.mailfrom=huawei.com; dkim=pass (1024-bit key) header.d=huawei.com header.i=@huawei.com header.b=Z62Wt88r; arc=none smtp.client-ip=113.46.200.226 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=huawei.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=huawei.com header.i=@huawei.com header.b="Z62Wt88r" dkim-signature: v=1; a=rsa-sha256; d=huawei.com; s=dkim; c=relaxed/relaxed; q=dns/txt; h=From; bh=N6Ab8j1SpCgvGVmORiB+3Xjbux4zd83gTeP1l1ZPmw0=; b=Z62Wt88rUmLgOeeTr2PpWPXzUd7+TxsnHtdwuSIrdxouovzqs8sRMKpBe71iqO2M4g5TI3huM JAXTb1asaSoXCKaiqBzVJFrNnEYoPOwrth5WanrvkzM5qu6AIXawSl1D/ZV68ThCWciH8WRDmx/ cwyP5VQyY/4XWX7kGUhs5Mc= Received: from mail.maildlp.com (unknown [172.19.163.15]) by canpmsgout11.his.huawei.com (SkyGuard) with ESMTPS id 4f7R796gWvzKm4t; Sat, 7 Feb 2026 17:51:33 +0800 (CST) Received: from dggemv706-chm.china.huawei.com (unknown [10.3.19.33]) by mail.maildlp.com (Postfix) with ESMTPS id 7AC2640565; Sat, 7 Feb 2026 17:56:10 +0800 (CST) Received: from kwepemq100007.china.huawei.com (7.202.195.175) by dggemv706-chm.china.huawei.com (10.3.19.33) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.11; Sat, 7 Feb 2026 17:56:10 +0800 Received: from localhost.huawei.com (10.169.71.169) by kwepemq100007.china.huawei.com (7.202.195.175) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.11; Sat, 7 Feb 2026 17:56:09 +0800 From: Yongbang Shi To: , , , , , , , , CC: , , , , , , , , Subject: [PATCH drm-dp 1/4] drm/hisilicon/hibmc: add updating link cap in DP detect() Date: Sat, 7 Feb 2026 17:48:34 +0800 Message-ID: <20260207094837.1468985-2-shiyongbang@huawei.com> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20260207094837.1468985-1-shiyongbang@huawei.com> References: <20260207094837.1468985-1-shiyongbang@huawei.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: kwepems500002.china.huawei.com (7.221.188.17) To kwepemq100007.china.huawei.com (7.202.195.175) Content-Type: text/plain; charset="utf-8" From: Lin He In the past, the link cap is updated in link training at encoder enable stage, but the hibmc_dp_mode_valid() is called before it, which will use DP link's rate and lanes. So add the hibmc_dp_update_caps() in hibmc_dp_update_caps() to avoid some potential risks. Fixes: e6c7c59da494 ("drm/hisilicon/hibmc: add dp mode valid check") Signed-off-by: Lin He Signed-off-by: Yongbang Shi --- drivers/gpu/drm/hisilicon/hibmc/dp/dp_comm.h | 1 + drivers/gpu/drm/hisilicon/hibmc/dp/dp_link.c | 2 +- drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_dp.c | 2 ++ 3 files changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/hisilicon/hibmc/dp/dp_comm.h b/drivers/gpu/drm= /hisilicon/hibmc/dp/dp_comm.h index f9ee7ebfec55..f53dac256ee0 100644 --- a/drivers/gpu/drm/hisilicon/hibmc/dp/dp_comm.h +++ b/drivers/gpu/drm/hisilicon/hibmc/dp/dp_comm.h @@ -69,5 +69,6 @@ int hibmc_dp_link_training(struct hibmc_dp_dev *dp); int hibmc_dp_serdes_init(struct hibmc_dp_dev *dp); int hibmc_dp_serdes_rate_switch(u8 rate, struct hibmc_dp_dev *dp); int hibmc_dp_serdes_set_tx_cfg(struct hibmc_dp_dev *dp, u8 train_set[HIBMC= _DP_LANE_NUM_MAX]); +void hibmc_dp_update_caps(struct hibmc_dp_dev *dp); =20 #endif diff --git a/drivers/gpu/drm/hisilicon/hibmc/dp/dp_link.c b/drivers/gpu/drm= /hisilicon/hibmc/dp/dp_link.c index 0726cb5b736e..8c53f16db516 100644 --- a/drivers/gpu/drm/hisilicon/hibmc/dp/dp_link.c +++ b/drivers/gpu/drm/hisilicon/hibmc/dp/dp_link.c @@ -325,7 +325,7 @@ static int hibmc_dp_link_downgrade_training_eq(struct h= ibmc_dp_dev *dp) return hibmc_dp_link_reduce_rate(dp); } =20 -static void hibmc_dp_update_caps(struct hibmc_dp_dev *dp) +void hibmc_dp_update_caps(struct hibmc_dp_dev *dp) { dp->link.cap.link_rate =3D dp->dpcd[DP_MAX_LINK_RATE]; if (dp->link.cap.link_rate > DP_LINK_BW_8_1 || !dp->link.cap.link_rate) diff --git a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_dp.c b/drivers/gpu/d= rm/hisilicon/hibmc/hibmc_drm_dp.c index 616821e3c933..35dff7bfbf76 100644 --- a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_dp.c +++ b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_dp.c @@ -41,6 +41,8 @@ static bool hibmc_dp_get_dpcd(struct hibmc_dp_dev *dp_dev) if (ret) return false; =20 + hibmc_dp_update_caps(dp_dev); + dp_dev->is_branch =3D drm_dp_is_branch(dp_dev->dpcd); =20 ret =3D drm_dp_read_desc(dp_dev->aux, &dp_dev->desc, dp_dev->is_branch); --=20 2.33.0