From patchwork Thu Jun 18 23:39:59 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stephen Boyd X-Patchwork-Id: 11613067 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 173A21392 for ; Thu, 18 Jun 2020 23:40:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0042C208B3 for ; Thu, 18 Jun 2020 23:40:12 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b="JGQdHi4c" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728080AbgFRXkM (ORCPT ); Thu, 18 Jun 2020 19:40:12 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55404 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727937AbgFRXkD (ORCPT ); Thu, 18 Jun 2020 19:40:03 -0400 Received: from mail-pl1-x641.google.com (mail-pl1-x641.google.com [IPv6:2607:f8b0:4864:20::641]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4CDCDC061794 for ; Thu, 18 Jun 2020 16:40:02 -0700 (PDT) Received: by mail-pl1-x641.google.com with SMTP id n9so3169414plk.1 for ; Thu, 18 Jun 2020 16:40:02 -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=0LwNUM9r2K766Bpc8uhRggwPkvLcxyldoWgAyqBsLHs=; b=JGQdHi4cAk9ynSlkc2MLZrVw9vuu0aa67R3mMbMXCKleaglDUWIgiBE9LgBxuCJX9/ Q0AHLynQe4sKoPSZhrnps5qRe+CywpQ30+7AFC10rSRq/IajqSOZdLYKEDIR3Al6AAxc T9Sdas8h9nx2DwLg2KFwPelACgyIMiUDXlWw8= 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=0LwNUM9r2K766Bpc8uhRggwPkvLcxyldoWgAyqBsLHs=; b=FDEq+V9CRLNeT376uU/WvLHsaIRRlynfVBA8xewlAYYwk2kHGFCuWeG1h/1++ZpCh0 m9LcalR+3wp54f1LPe10t+fTwKnguSsv+lY42Tumpqget+ptbjj22omoJr/kB9fwX8nS ZRaJBzjTFFHKMYovjk4+56qQVj7zCc0hcO14INUtsFL7gqmMvt+fWySUfeAUShZXcuuQ NUQszi0vdXOjrZI1stfLQ713suNF6B8OlBJFFovxr9EBZfT6iS9BdQLA8sYKWphMiY92 STCzpXQ9Qn0zwZMhh0JHZKoLj2R2weMXssBSwKAEe/055HM03kCoUhU+oRrCkwE/hjjg K0Xw== X-Gm-Message-State: AOAM533bIDIOycPrluSKIN9kMtVGEasZ+tu0Ywf9iil1uVMHU5c4atw9 4Jh5gv0KiTNkyFzV+NkaXcglzA== X-Google-Smtp-Source: ABdhPJwQ/hJoSBJMHMkuQtqXhSeDW1z3BUpC+AR+YhDRj5//RUP55YF1vFN5nLf+YeDoKlM4/qVEcg== X-Received: by 2002:a17:90a:7c4e:: with SMTP id e14mr732821pjl.175.1592523601795; Thu, 18 Jun 2020 16:40:01 -0700 (PDT) Received: from smtp.gmail.com ([2620:15c:202:1:fa53:7765:582b:82b9]) by smtp.gmail.com with ESMTPSA id r202sm3876993pfr.185.2020.06.18.16.40.00 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 18 Jun 2020 16:40:01 -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 7/5] spi: spi-geni-qcom: Don't set {tx,rx}_rem_bytes unnecessarily Date: Thu, 18 Jun 2020 16:39:59 -0700 Message-Id: <20200618233959.160032-2-swboyd@chromium.org> X-Mailer: git-send-email 2.27.0.111.gc72c7da667-goog In-Reply-To: <20200618150626.237027-1-dianders@chromium.org> References: <20200618150626.237027-1-dianders@chromium.org> MIME-Version: 1.0 Sender: linux-arm-msm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@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. Cc: Douglas Anderson Signed-off-by: Stephen Boyd Reviewed-by: Douglas Anderson --- 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 670f83793aa4..828cfc988a3f 100644 --- a/drivers/spi/spi-geni-qcom.c +++ b/drivers/spi/spi-geni-qcom.c @@ -126,7 +126,6 @@ static void handle_fifo_timeout(struct spi_master *spi, * came in while cancelling. */ mas->cur_xfer = NULL; - mas->tx_rem_bytes = mas->rx_rem_bytes = 0; geni_se_cancel_m_cmd(se); spin_unlock_irq(&mas->lock); @@ -517,29 +516,30 @@ 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)