From patchwork Sat Jun 20 02:22:33 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stephen Boyd X-Patchwork-Id: 11615353 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 5DAE1138C for ; Sat, 20 Jun 2020 02:22:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3BAE422DA7 for ; Sat, 20 Jun 2020 02:22:48 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b="Jre00MLL" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731775AbgFTCWk (ORCPT ); Fri, 19 Jun 2020 22:22:40 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47762 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731762AbgFTCWh (ORCPT ); Fri, 19 Jun 2020 22:22:37 -0400 Received: from mail-pj1-x1043.google.com (mail-pj1-x1043.google.com [IPv6:2607:f8b0:4864:20::1043]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 35A44C06174E for ; Fri, 19 Jun 2020 19:22:37 -0700 (PDT) Received: by mail-pj1-x1043.google.com with SMTP id jz3so4934519pjb.0 for ; Fri, 19 Jun 2020 19:22:37 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=8daI+7CHtS2SGwOQ57VLIhX3tB1mOsr4d2U1XP+ENVs=; b=Jre00MLLpeaEgMC7xAvwh2VApA4lk7QcQsV8D6Mxzsvq52gxPrBBFi8bp0/8hHanCK 7E2qXxpp5//4sx2ENJklcEAzL5VVFcq1pAbfN1/DmdQB7AZY8ysHqm+KBKWhPRm14hTa q+l3du9vfNpJxVxa+jI3vnJhiwzUUCNNx+vlw= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=8daI+7CHtS2SGwOQ57VLIhX3tB1mOsr4d2U1XP+ENVs=; b=ZRLla/A2zPCR94BpCrh2Q75HDiqw71sK8y1XC8ozVUAtJ9o/UEoDJIWAUWgFY5n10B /2EbakKl0UlcPLYN7+4U+xXibfXuDbqbqJsEcHBddVvbqy/kESn9CySEQ4+woUCNqDGU BRckAdnfbH7eh9y1AauyqE5G0hMmXqERgrGCkiefZ4/Hir4s9R++P0j+m6bcVnPkIe6Q jDvGYShvvjTJtPZ3NdS7Zr2TFjNFt8nA/ql2juuAKIV7xVdy1fdsbm7zASg3SSsf00kN jUgvgCTDua3I/ncvhHUJWH6NTo+HwVaFpaCXGmdw+VAf6NjewaOfYYqOrAHci/kUhgz0 mFOA== X-Gm-Message-State: AOAM531mRhODm9apL94h1YIyjo4e6AQm0KcJ+IQxOFufbCn3qvQhn6PA nrChqcuJN5dibPIrePxWTCMKLA== X-Google-Smtp-Source: ABdhPJxZVZK+DAbBoeCkpomttawBBc2pN2fNIkuE1bBJYMAglO+5AXAsYm304Uz2BQLoz+gqupcDXw== X-Received: by 2002:a17:902:ed49:: with SMTP id y9mr10440152plb.284.1592619756732; Fri, 19 Jun 2020 19:22:36 -0700 (PDT) Received: from smtp.gmail.com ([2620:15c:202:1:fa53:7765:582b:82b9]) by smtp.gmail.com with ESMTPSA id m14sm6241911pjv.12.2020.06.19.19.22.36 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 19 Jun 2020 19:22:36 -0700 (PDT) From: Stephen Boyd To: Mark Brown Cc: linux-kernel@vger.kernel.org, Alok Chauhan , linux-arm-msm@vger.kernel.org, linux-spi@vger.kernel.org, Douglas Anderson Subject: [PATCH v1 2/2] spi: spi-geni-qcom: Don't set {tx,rx}_rem_bytes unnecessarily Date: Fri, 19 Jun 2020 19:22:33 -0700 Message-Id: <20200620022233.64716-3-swboyd@chromium.org> X-Mailer: git-send-email 2.27.0.111.gc72c7da667-goog In-Reply-To: <20200620022233.64716-1-swboyd@chromium.org> References: <20200620022233.64716-1-swboyd@chromium.org> MIME-Version: 1.0 Sender: linux-spi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-spi@vger.kernel.org We only need to test for these counters being non-zero when we see the end of a transfer. If we're doing a CS change then they will already be zero. This implies that we don't need to set these to 0 if we're cancelling an in flight transfer too, because we only care to test these counters when the 'DONE' bit is set in the hardware and we've set them to non-zero for a transfer. This is a non-functional change, just cleanup to consolidate code. Reviewed-by: Douglas Anderson Signed-off-by: Stephen Boyd --- drivers/spi/spi-geni-qcom.c | 42 ++++++++++++++++++------------------- 1 file changed, 21 insertions(+), 21 deletions(-) diff --git a/drivers/spi/spi-geni-qcom.c b/drivers/spi/spi-geni-qcom.c index d8f03ffb8594..5b1dca1fff79 100644 --- a/drivers/spi/spi-geni-qcom.c +++ b/drivers/spi/spi-geni-qcom.c @@ -122,7 +122,6 @@ static void handle_fifo_timeout(struct spi_master *spi, reinit_completion(&mas->cancel_done); writel(0, se->base + SE_GENI_TX_WATERMARK_REG); mas->cur_xfer = NULL; - mas->tx_rem_bytes = mas->rx_rem_bytes = 0; geni_se_cancel_m_cmd(se); spin_unlock_irq(&mas->lock); @@ -513,29 +512,30 @@ static irqreturn_t geni_spi_isr(int irq, void *data) if (mas->cur_xfer) { spi_finalize_current_transfer(spi); mas->cur_xfer = NULL; + /* + * If this happens, then a CMD_DONE came before all the + * Tx buffer bytes were sent out. This is unusual, log + * this condition and disable the WM interrupt to + * prevent the system from stalling due an interrupt + * storm. + * + * If this happens when all Rx bytes haven't been + * received, log the condition. The only known time + * this can happen is if bits_per_word != 8 and some + * registers that expect xfer lengths in num spi_words + * weren't written correctly. + */ + if (mas->tx_rem_bytes) { + writel(0, se->base + SE_GENI_TX_WATERMARK_REG); + dev_err(mas->dev, "Premature done. tx_rem = %d bpw%d\n", + mas->tx_rem_bytes, mas->cur_bits_per_word); + } + if (mas->rx_rem_bytes) + dev_err(mas->dev, "Premature done. rx_rem = %d bpw%d\n", + mas->rx_rem_bytes, mas->cur_bits_per_word); } else { complete(&mas->cs_done); } - - /* - * If this happens, then a CMD_DONE came before all the Tx - * buffer bytes were sent out. This is unusual, log this - * condition and disable the WM interrupt to prevent the - * system from stalling due an interrupt storm. - * If this happens when all Rx bytes haven't been received, log - * the condition. - * The only known time this can happen is if bits_per_word != 8 - * and some registers that expect xfer lengths in num spi_words - * weren't written correctly. - */ - if (mas->tx_rem_bytes) { - writel(0, se->base + SE_GENI_TX_WATERMARK_REG); - dev_err(mas->dev, "Premature done. tx_rem = %d bpw%d\n", - mas->tx_rem_bytes, mas->cur_bits_per_word); - } - if (mas->rx_rem_bytes) - dev_err(mas->dev, "Premature done. rx_rem = %d bpw%d\n", - mas->rx_rem_bytes, mas->cur_bits_per_word); } if (m_irq & M_CMD_CANCEL_EN)