From nobody Sun Feb 8 18:15:13 2026 Received: from out-176.mta1.migadu.com (out-176.mta1.migadu.com [95.215.58.176]) (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 68EC3159563 for ; Fri, 3 May 2024 19:29:45 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=95.215.58.176 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1714764587; cv=none; b=syMsVVDAQh3M5xPawWI4EDk3LTFJkK7Fe5thWUucltisLcqK5E1bfg0tmd8c9PE+YUuqXdI/D9K3gx4yx0m5tDZ8dN5HFfqfLH5QynmmO3kvWWM13d48J0EAfFRGdVm0uyOvp3nk5y8hNyqEFr083yX0Ipsg/9oLLAA5O+DF9QQ= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1714764587; c=relaxed/simple; bh=RMlqV0VUpqpQnxZoS9nZY5pwBRQjG77R+tZQT2029pA=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=VaxRGgLfa4MstovtNWf8VL06AGYbZt2Gez1z9znyIB10yZ61/gM/Aad9MlRtBW01R7bo5iJZplF/D+r/2W50mFH6IXXcpRE9eWOtjFuspx3b9pJlfpVZlM3XrAG4kLB474dZLf3OieHlMG8UYWZMTW6vMFMPGySjx9KrF+DxWPg= 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=EIfiCX+K; arc=none smtp.client-ip=95.215.58.176 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="EIfiCX+K" 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=1714764583; 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=ZnNyibVBZ4guVSKzjswh2SDm2WCZ3plJ5HkFiwOD2P0=; b=EIfiCX+Kq3Zs0TS6qdapjCeDjZTRbaJhJmibGvxxQBc+HOiWQ7mNgwAwF2Z8Pmb5hbrvwb 06myokd+EjfhPfODELKupL+78GItZeyv9rPm0tx9ScL4B7wcnDAf4s5UXDtHI5rGnKb8tp blcpA7536thtJzyQVx+HHyEVqpmq7t4= 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 07/10] drm: zynqmp_dp: Use AUX IRQs instead of polling Date: Fri, 3 May 2024 15:29:19 -0400 Message-Id: <20240503192922.2172314-8-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" Instead of polling the status register for the AUX status, just enable the IRQs and signal a completion. Signed-off-by: Sean Anderson --- (no changes since v3) Changes in v3: - New drivers/gpu/drm/xlnx/zynqmp_dp.c | 35 +++++++++++++++++++++++--------- 1 file changed, 25 insertions(+), 10 deletions(-) diff --git a/drivers/gpu/drm/xlnx/zynqmp_dp.c b/drivers/gpu/drm/xlnx/zynqmp= _dp.c index c9cdfb56f23e..38610a5b932a 100644 --- a/drivers/gpu/drm/xlnx/zynqmp_dp.c +++ b/drivers/gpu/drm/xlnx/zynqmp_dp.c @@ -286,6 +286,7 @@ struct zynqmp_dp_config { * @next_bridge: The downstream bridge * @config: IP core configuration from DTS * @aux: aux channel + * @aux_done: Completed when we get an AUX reply or timeout * @phy: PHY handles for DP lanes * @num_lanes: number of enabled phy lanes * @hpd_work: hot plug detection worker @@ -306,6 +307,7 @@ struct zynqmp_dp { struct drm_bridge bridge; struct work_struct hpd_work; struct work_struct hpd_irq_work; + struct completion aux_done; struct mutex lock; =20 struct drm_bridge *next_bridge; @@ -942,12 +944,15 @@ static int zynqmp_dp_aux_cmd_submit(struct zynqmp_dp = *dp, u32 cmd, u16 addr, u8 *buf, u8 bytes, u8 *reply) { bool is_read =3D (cmd & AUX_READ_BIT) ? true : false; + unsigned long time_left; u32 reg, i; =20 reg =3D zynqmp_dp_read(dp, ZYNQMP_DP_INTERRUPT_SIGNAL_STATE); if (reg & ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REQUEST) return -EBUSY; =20 + reinit_completion(&dp->aux_done); + zynqmp_dp_write(dp, ZYNQMP_DP_AUX_ADDRESS, addr); if (!is_read) for (i =3D 0; i < bytes; i++) @@ -962,17 +967,14 @@ static int zynqmp_dp_aux_cmd_submit(struct zynqmp_dp = *dp, u32 cmd, u16 addr, zynqmp_dp_write(dp, ZYNQMP_DP_AUX_COMMAND, reg); =20 /* Wait for reply to be delivered upto 2ms */ - for (i =3D 0; ; i++) { - reg =3D zynqmp_dp_read(dp, ZYNQMP_DP_INTERRUPT_SIGNAL_STATE); - if (reg & ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REPLY) - break; + time_left =3D wait_for_completion_timeout(&dp->aux_done, + msecs_to_jiffies(2)); + if (!time_left) + return -ETIMEDOUT; =20 - if (reg & ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REPLY_TIMEOUT || - i =3D=3D 2) - return -ETIMEDOUT; - - usleep_range(1000, 1100); - } + reg =3D zynqmp_dp_read(dp, ZYNQMP_DP_INTERRUPT_SIGNAL_STATE); + if (reg & ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REPLY_TIMEOUT) + return -ETIMEDOUT; =20 reg =3D zynqmp_dp_read(dp, ZYNQMP_DP_AUX_REPLY_CODE); if (reply) @@ -1056,6 +1058,9 @@ static int zynqmp_dp_aux_init(struct zynqmp_dp *dp) (w << ZYNQMP_DP_AUX_CLK_DIVIDER_AUX_FILTER_SHIFT) | (rate / (1000 * 1000))); =20 + zynqmp_dp_write(dp, ZYNQMP_DP_INT_EN, ZYNQMP_DP_INT_REPLY_RECEIVED | + ZYNQMP_DP_INT_REPLY_TIMEOUT); + dp->aux.name =3D "ZynqMP DP AUX"; dp->aux.dev =3D dp->dev; dp->aux.drm_dev =3D dp->bridge.dev; @@ -1073,6 +1078,9 @@ static int zynqmp_dp_aux_init(struct zynqmp_dp *dp) static void zynqmp_dp_aux_cleanup(struct zynqmp_dp *dp) { drm_dp_aux_unregister(&dp->aux); + + zynqmp_dp_write(dp, ZYNQMP_DP_INT_DS, ZYNQMP_DP_INT_REPLY_RECEIVED | + ZYNQMP_DP_INT_REPLY_TIMEOUT); } =20 /* -----------------------------------------------------------------------= ------ @@ -1730,6 +1738,12 @@ static irqreturn_t zynqmp_dp_irq_handler(int irq, vo= id *data) if (status & ZYNQMP_DP_INT_HPD_IRQ) schedule_work(&dp->hpd_irq_work); =20 + if (status & ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REPLY) + complete(&dp->aux_done); + + if (status & ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REPLY_TIMEOUT) + complete(&dp->aux_done); + return IRQ_HANDLED; } =20 @@ -1753,6 +1767,7 @@ int zynqmp_dp_probe(struct zynqmp_dpsub *dpsub) dp->dpsub =3D dpsub; dp->status =3D connector_status_disconnected; mutex_init(&dp->lock); + init_completion(&dp->aux_done); =20 INIT_WORK(&dp->hpd_work, zynqmp_dp_hpd_work_func); INIT_WORK(&dp->hpd_irq_work, zynqmp_dp_hpd_irq_work_func); --=20 2.35.1.1320.gc452695387.dirty