From patchwork Wed Apr 15 10:23:17 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Akash Asthana X-Patchwork-Id: 11490915 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 3CBB381 for ; Wed, 15 Apr 2020 10:26:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 240DA2078A for ; Wed, 15 Apr 2020 10:26:34 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=mg.codeaurora.org header.i=@mg.codeaurora.org header.b="UMCrm5eQ" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2408596AbgDOK0S (ORCPT ); Wed, 15 Apr 2020 06:26:18 -0400 Received: from mail27.static.mailgun.info ([104.130.122.27]:22594 "EHLO mail27.static.mailgun.info" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2408593AbgDOKZW (ORCPT ); Wed, 15 Apr 2020 06:25:22 -0400 DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.codeaurora.org; q=dns/txt; s=smtp; t=1586946321; h=References: In-Reply-To: Message-Id: Date: Subject: Cc: To: From: Sender; bh=luBfxFqU23uZWqipUF2fYqbTZCIiKLA/R6DtmneWVqM=; b=UMCrm5eQrqLgpU3tlgPGwBhYM5BDua1AS/clv/to0vkTS6eaERuQTlJxzpl5uPcKGJ4apgfs IQgBSqQfVi+NRNoK2CCXOq9DQCbvNz5+Rb2miF8PHAmlAvwxnSmjLiZemYdZtuu2dRZ+nHqb 7D/6b2He7h7UY4p8oG89rx7EZpc= X-Mailgun-Sending-Ip: 104.130.122.27 X-Mailgun-Sid: WyIzNzdmZSIsICJsaW51eC1zcGlAdmdlci5rZXJuZWwub3JnIiwgImJlOWU0YSJd Received: from smtp.codeaurora.org (ec2-35-166-182-171.us-west-2.compute.amazonaws.com [35.166.182.171]) by mxa.mailgun.org with ESMTP id 5e96e0fd.7f56faf17d50-smtp-out-n01; Wed, 15 Apr 2020 10:25:01 -0000 (UTC) Received: by smtp.codeaurora.org (Postfix, from userid 1001) id 527AEC433F2; Wed, 15 Apr 2020 10:25:01 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-caf-mail-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-1.0 required=2.0 tests=ALL_TRUSTED,SPF_NONE autolearn=ham autolearn_force=no version=3.4.0 Received: from akashast-linux.qualcomm.com (blr-c-bdr-fw-01_GlobalNAT_AllZones-Outside.qualcomm.com [103.229.19.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: akashast) by smtp.codeaurora.org (Postfix) with ESMTPSA id 70676C433CB; Wed, 15 Apr 2020 10:24:55 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 70676C433CB Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; spf=none smtp.mailfrom=akashast@codeaurora.org From: Akash Asthana To: gregkh@linuxfoundation.org, agross@kernel.org, bjorn.andersson@linaro.org, wsa@the-dreams.de, broonie@kernel.org, mark.rutland@arm.com, robh+dt@kernel.org, georgi.djakov@linaro.org Cc: linux-i2c@vger.kernel.org, linux-spi@vger.kernel.org, devicetree@vger.kernel.org, swboyd@chromium.org, mgautam@codeaurora.org, linux-arm-msm@vger.kernel.org, linux-serial@vger.kernel.org, mka@chromium.org, dianders@chromium.org, evgreen@chromium.org, Akash Asthana Subject: [PATCH V4 8/9] spi: spi-qcom-qspi: Add interconnect support Date: Wed, 15 Apr 2020 15:53:17 +0530 Message-Id: <1586946198-13912-9-git-send-email-akashast@codeaurora.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1586946198-13912-1-git-send-email-akashast@codeaurora.org> References: <1586946198-13912-1-git-send-email-akashast@codeaurora.org> Sender: linux-spi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-spi@vger.kernel.org Get the interconnect paths for QSPI device and vote according to the current bus speed of the driver. Signed-off-by: Akash Asthana Reviewed by: Matthias Kaehlcke --- Changes in V2: - As per Bjorn's comment, introduced and using devm_of_icc_get API for getting path handle - As per Matthias comment, added error handling for icc_set_bw call Changes in V3: - No Change. Changes in V4: - As per Mark's comment move peak_bw guess as twice of avg_bw if nothing mentioned explicitly to ICC core. drivers/spi/spi-qcom-qspi.c | 43 ++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 42 insertions(+), 1 deletion(-) diff --git a/drivers/spi/spi-qcom-qspi.c b/drivers/spi/spi-qcom-qspi.c index 3c4f83b..5aaf454 100644 --- a/drivers/spi/spi-qcom-qspi.c +++ b/drivers/spi/spi-qcom-qspi.c @@ -2,6 +2,7 @@ // Copyright (c) 2017-2018, The Linux foundation. All rights reserved. #include +#include #include #include #include @@ -139,7 +140,10 @@ struct qcom_qspi { struct device *dev; struct clk_bulk_data *clks; struct qspi_xfer xfer; - /* Lock to protect xfer and IRQ accessed registers */ + struct icc_path *icc_path_cpu_to_qspi; + unsigned int avg_bw_cpu; + unsigned int peak_bw_cpu; + /* Lock to protect data accessed by IRQs */ spinlock_t lock; }; @@ -241,6 +245,16 @@ static int qcom_qspi_transfer_one(struct spi_master *master, return ret; } + /* Set BW quota for CPU as driver supports FIFO mode only. */ + ctrl->avg_bw_cpu = Bps_to_icc(speed_hz); + ret = icc_set_bw(ctrl->icc_path_cpu_to_qspi, ctrl->avg_bw_cpu, + ctrl->peak_bw_cpu); + if (ret) { + dev_err(ctrl->dev, "%s: ICC BW voting failed for cpu\n", + __func__); + return ret; + } + spin_lock_irqsave(&ctrl->lock, flags); /* We are half duplex, so either rx or tx will be set */ @@ -458,6 +472,16 @@ static int qcom_qspi_probe(struct platform_device *pdev) if (ret) goto exit_probe_master_put; + ctrl->icc_path_cpu_to_qspi = devm_of_icc_get(dev, "qspi-config"); + if (IS_ERR(ctrl->icc_path_cpu_to_qspi)) { + ret = PTR_ERR(ctrl->icc_path_cpu_to_qspi); + if (ret != -EPROBE_DEFER) + dev_err(dev, "Failed to get cpu path, ret:%d\n", ret); + goto exit_probe_master_put; + } + /* Put BW vote on CPU path for register access */ + ctrl->avg_bw_cpu = Bps_to_icc(1000); + ret = platform_get_irq(pdev, 0); if (ret < 0) goto exit_probe_master_put; @@ -511,9 +535,17 @@ static int __maybe_unused qcom_qspi_runtime_suspend(struct device *dev) { struct spi_master *master = dev_get_drvdata(dev); struct qcom_qspi *ctrl = spi_master_get_devdata(master); + int ret; clk_bulk_disable_unprepare(QSPI_NUM_CLKS, ctrl->clks); + ret = icc_set_bw(ctrl->icc_path_cpu_to_qspi, 0, 0); + if (ret) { + dev_err_ratelimited(ctrl->dev, "%s: ICC BW remove failed for cpu\n", + __func__); + return ret; + } + return 0; } @@ -521,6 +553,15 @@ static int __maybe_unused qcom_qspi_runtime_resume(struct device *dev) { struct spi_master *master = dev_get_drvdata(dev); struct qcom_qspi *ctrl = spi_master_get_devdata(master); + int ret; + + ret = icc_set_bw(ctrl->icc_path_cpu_to_qspi, ctrl->avg_bw_cpu, + ctrl->peak_bw_cpu); + if (ret) { + dev_err_ratelimited(ctrl->dev, "%s: ICC BW voting failed for cpu\n", + __func__); + return ret; + } return clk_bulk_prepare_enable(QSPI_NUM_CLKS, ctrl->clks); }