From patchwork Fri Aug 9 19:35:57 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sean Anderson X-Patchwork-Id: 13759236 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 2A3A5C52D7C for ; Fri, 9 Aug 2024 19:40:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=D/1fpZ1MDjJV5NAFHCktQ3DE7M2fl+H7jRHKmk5SH1w=; b=YgBvjz2tZQ7KRqokUrcTqKwR3a wuYbB6U3icu+FcmnwxGF1eWcjoaSa6TNiVhnGaFJ7N2xIyWkt8X21EhJzugrK2vSDi6S89OYRZ8Sd RETLpRpKcqTZY5X2haxWRDjt7HhINYiTcm7UEOKrIF6fPqnTYuYMEjW+QbL2jIH3FMl7ek7r4eVoY IgTO75IJBbXOR1Jk47zCiaEhtbUdhZc8yFGtDu7UbufPTG4qopEETMTtChHF5ZZ9sR+vQIfAa6BGB fHMP6cUMLU0NlV3L79IDrgnU1p7KSLinQD66YDzpQqdr+NNb9lHZtkTVtPTYl5ojkyLHg1Qik/HlE s6sDXBPQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1scVSq-0000000COSn-32sp; Fri, 09 Aug 2024 19:39:52 +0000 Received: from out-181.mta1.migadu.com ([95.215.58.181]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1scVPb-0000000CNO5-3Fxl for linux-arm-kernel@lists.infradead.org; Fri, 09 Aug 2024 19:36:33 +0000 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=1723232189; 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=D/1fpZ1MDjJV5NAFHCktQ3DE7M2fl+H7jRHKmk5SH1w=; b=rk48672LdAlHsdDNaArDOsbGYWOC8O3aFLyhLbPYmL/e+q2+Th/BBBDIkYiaRblttnCuQR DZpp4jW87UT0RPSf5tMCmzE7XCa9dH5/cga8z4WpmsMi+6fcXngZA3+5YCNjXLgVwYkdad ytz4PFcM5wnlgKP6AknHBNxkh2NrDeo= From: Sean Anderson To: Laurent Pinchart , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , dri-devel@lists.freedesktop.org Cc: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, David Airlie , Michal Simek , Daniel Vetter , Tomi Valkeinen , Sean Anderson Subject: [PATCH v6 5/8] drm: zynqmp_dp: Use AUX IRQs instead of polling Date: Fri, 9 Aug 2024 15:35:57 -0400 Message-Id: <20240809193600.3360015-6-sean.anderson@linux.dev> In-Reply-To: <20240809193600.3360015-1-sean.anderson@linux.dev> References: <20240809193600.3360015-1-sean.anderson@linux.dev> MIME-Version: 1.0 X-Migadu-Flow: FLOW_OUT X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240809_123631_982625_A63131BF X-CRM114-Status: GOOD ( 14.40 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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 532e103713b3..babfa3581014 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; 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 = (cmd & AUX_READ_BIT) ? true : false; + unsigned long time_left; u32 reg, i; reg = zynqmp_dp_read(dp, ZYNQMP_DP_INTERRUPT_SIGNAL_STATE); if (reg & ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REQUEST) return -EBUSY; + reinit_completion(&dp->aux_done); + zynqmp_dp_write(dp, ZYNQMP_DP_AUX_ADDRESS, addr); if (!is_read) for (i = 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); /* Wait for reply to be delivered upto 2ms */ - for (i = 0; ; i++) { - reg = zynqmp_dp_read(dp, ZYNQMP_DP_INTERRUPT_SIGNAL_STATE); - if (reg & ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REPLY) - break; + time_left = wait_for_completion_timeout(&dp->aux_done, + msecs_to_jiffies(2)); + if (!time_left) + return -ETIMEDOUT; - if (reg & ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REPLY_TIMEOUT || - i == 2) - return -ETIMEDOUT; - - usleep_range(1000, 1100); - } + reg = zynqmp_dp_read(dp, ZYNQMP_DP_INTERRUPT_SIGNAL_STATE); + if (reg & ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REPLY_TIMEOUT) + return -ETIMEDOUT; reg = 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))); + zynqmp_dp_write(dp, ZYNQMP_DP_INT_EN, ZYNQMP_DP_INT_REPLY_RECEIVED | + ZYNQMP_DP_INT_REPLY_TIMEOUT); + dp->aux.name = "ZynqMP DP AUX"; dp->aux.dev = dp->dev; dp->aux.drm_dev = 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); } /* ----------------------------------------------------------------------------- @@ -1730,6 +1738,12 @@ static irqreturn_t zynqmp_dp_irq_handler(int irq, void *data) if (status & ZYNQMP_DP_INT_HPD_IRQ) schedule_work(&dp->hpd_irq_work); + 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; } @@ -1753,6 +1767,7 @@ int zynqmp_dp_probe(struct zynqmp_dpsub *dpsub) dp->dpsub = dpsub; dp->status = connector_status_disconnected; mutex_init(&dp->lock); + init_completion(&dp->aux_done); INIT_WORK(&dp->hpd_work, zynqmp_dp_hpd_work_func); INIT_WORK(&dp->hpd_irq_work, zynqmp_dp_hpd_irq_work_func);