From nobody Sun Feb 8 06:05:32 2026 Received: from out-189.mta1.migadu.com (out-189.mta1.migadu.com [95.215.58.189]) (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 66915158DDB for ; Fri, 3 May 2024 19:29:41 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=95.215.58.189 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1714764582; cv=none; b=cmsMrzjzJpv/b1fVbU6lvwE268f1BGMAwMCV78uF+NkEiYBvKUaV5dpzi2ZoEQDMY4PdXbpxjKtUxHEGY9++g1s3hySEcq6krVXfwGCpMmJC/+SZiPhb3OJTIZr58TdIIyGIRmXVwxskhdUTmGK52ze5KVO6TuNoCn+xjmoFDS4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1714764582; c=relaxed/simple; bh=x+wSYNOqgr2hFIz9pBmvTXxnW1v3NMXXowtHGap2lh4=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=XMR+WfxXZahtnDQ3YRcsxvTGvTwQWszHwEDM8Bo8NU0i9dOqQ8CzLUVw1a3SX1hR4PPZBiWLiwyHtW/LQVILy8o8o7B2JcngM3jVsi6+r+KzBlpe4nySn8dpH17sx2+lTZyaamSFGTTYexeRot9rj3umxj/uf27VE6LA4slmnU8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b=wEtuohbx; arc=none smtp.client-ip=95.215.58.189 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b="wEtuohbx" X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1714764579; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=V/KsopdPTSQejykMzz4/KUwl6vzi9Fn3LMN3IMFqYkw=; b=wEtuohbxJycDDWCyWQE8bx2DRSgStlSDcz2LBVttsise9p1cK/rFnPG0OkG5G3pnUqIttZ agtZMAF1Cxrdz8D4pXP4jZrKawVpMv0+Yk7msZX7etzJZeojwyaOAM6mpRfs1UUm2xB9ZM lhEH27p7DHq6qRQV1zTNCP9jDLi+LnE= From: Sean Anderson To: Laurent Pinchart , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , dri-devel@lists.freedesktop.org Cc: linux-arm-kernel@lists.infradead.org, David Airlie , linux-kernel@vger.kernel.org, Daniel Vetter , Tomi Valkeinen , Michal Simek , Sean Anderson Subject: [PATCH v5 05/10] drm: zynqmp_dp: Don't retrain the link in our IRQ Date: Fri, 3 May 2024 15:29:17 -0400 Message-Id: <20240503192922.2172314-6-sean.anderson@linux.dev> In-Reply-To: <20240503192922.2172314-1-sean.anderson@linux.dev> References: <20240503192922.2172314-1-sean.anderson@linux.dev> 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-Migadu-Flow: FLOW_OUT Content-Type: text/plain; charset="utf-8" Retraining the link can take a while, and might involve waiting for DPCD reads/writes to complete. In preparation for unthreading the IRQ handler, move this into its own work function. Signed-off-by: Sean Anderson --- (no changes since v2) Changes in v2: - Document hpd_irq_work - Split this off from the locking changes drivers/gpu/drm/xlnx/zynqmp_dp.c | 45 ++++++++++++++++++++------------ 1 file changed, 29 insertions(+), 16 deletions(-) diff --git a/drivers/gpu/drm/xlnx/zynqmp_dp.c b/drivers/gpu/drm/xlnx/zynqmp= _dp.c index abfccd8bb5a7..cec5711c7026 100644 --- a/drivers/gpu/drm/xlnx/zynqmp_dp.c +++ b/drivers/gpu/drm/xlnx/zynqmp_dp.c @@ -289,6 +289,7 @@ struct zynqmp_dp_config { * @phy: PHY handles for DP lanes * @num_lanes: number of enabled phy lanes * @hpd_work: hot plug detection worker + * @hpd_irq_work: hot plug detection IRQ worker * @status: connection status * @enabled: flag to indicate if the device is enabled * @dpcd: DP configuration data from currently connected sink device @@ -304,6 +305,7 @@ struct zynqmp_dp { struct drm_dp_aux aux; struct drm_bridge bridge; struct work_struct hpd_work; + struct work_struct hpd_irq_work; struct mutex lock; =20 struct drm_bridge *next_bridge; @@ -1671,6 +1673,29 @@ static void zynqmp_dp_hpd_work_func(struct work_stru= ct *work) drm_bridge_hpd_notify(&dp->bridge, status); } =20 +static void zynqmp_dp_hpd_irq_work_func(struct work_struct *work) +{ + struct zynqmp_dp *dp =3D container_of(work, struct zynqmp_dp, + hpd_irq_work); + u8 status[DP_LINK_STATUS_SIZE + 2]; + int err; + + mutex_lock(&dp->lock); + err =3D drm_dp_dpcd_read(&dp->aux, DP_SINK_COUNT, status, + DP_LINK_STATUS_SIZE + 2); + if (err < 0) { + dev_dbg_ratelimited(dp->dev, + "could not read sink status: %d\n", err); + } else { + if (status[4] & DP_LINK_STATUS_UPDATED || + !drm_dp_clock_recovery_ok(&status[2], dp->mode.lane_cnt) || + !drm_dp_channel_eq_ok(&status[2], dp->mode.lane_cnt)) { + zynqmp_dp_train_loop(dp); + } + } + mutex_unlock(&dp->lock); +} + static irqreturn_t zynqmp_dp_irq_handler(int irq, void *data) { struct zynqmp_dp *dp =3D (struct zynqmp_dp *)data; @@ -1702,23 +1727,9 @@ static irqreturn_t zynqmp_dp_irq_handler(int irq, vo= id *data) if (status & ZYNQMP_DP_INT_HPD_EVENT) schedule_work(&dp->hpd_work); =20 - if (status & ZYNQMP_DP_INT_HPD_IRQ) { - int ret; - u8 status[DP_LINK_STATUS_SIZE + 2]; + if (status & ZYNQMP_DP_INT_HPD_IRQ) + schedule_work(&dp->hpd_irq_work); =20 - ret =3D drm_dp_dpcd_read(&dp->aux, DP_SINK_COUNT, status, - DP_LINK_STATUS_SIZE + 2); - if (ret < 0) - goto handled; - - if (status[4] & DP_LINK_STATUS_UPDATED || - !drm_dp_clock_recovery_ok(&status[2], dp->mode.lane_cnt) || - !drm_dp_channel_eq_ok(&status[2], dp->mode.lane_cnt)) { - zynqmp_dp_train_loop(dp); - } - } - -handled: return IRQ_HANDLED; } =20 @@ -1744,6 +1755,7 @@ int zynqmp_dp_probe(struct zynqmp_dpsub *dpsub) mutex_init(&dp->lock); =20 INIT_WORK(&dp->hpd_work, zynqmp_dp_hpd_work_func); + INIT_WORK(&dp->hpd_irq_work, zynqmp_dp_hpd_irq_work_func); =20 /* Acquire all resources (IOMEM, IRQ and PHYs). */ res =3D platform_get_resource_byname(pdev, IORESOURCE_MEM, "dp"); @@ -1848,6 +1860,7 @@ void zynqmp_dp_remove(struct zynqmp_dpsub *dpsub) zynqmp_dp_write(dp, ZYNQMP_DP_INT_DS, ZYNQMP_DP_INT_ALL); disable_irq(dp->irq); =20 + cancel_work_sync(&dp->hpd_irq_work); cancel_work_sync(&dp->hpd_work); =20 zynqmp_dp_write(dp, ZYNQMP_DP_TRANSMITTER_ENABLE, 0); --=20 2.35.1.1320.gc452695387.dirty