From patchwork Fri May 29 13:11:54 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Serge Semin X-Patchwork-Id: 11578561 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 966AF912 for ; Fri, 29 May 2020 13:12:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 86C7D207BC for ; Fri, 29 May 2020 13:12:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727000AbgE2NMV (ORCPT ); Fri, 29 May 2020 09:12:21 -0400 Received: from mail.baikalelectronics.com ([87.245.175.226]:48170 "EHLO mail.baikalelectronics.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726934AbgE2NMU (ORCPT ); Fri, 29 May 2020 09:12:20 -0400 Received: from localhost (unknown [127.0.0.1]) by mail.baikalelectronics.ru (Postfix) with ESMTP id 3A9F78030772; Fri, 29 May 2020 13:12:16 +0000 (UTC) X-Virus-Scanned: amavisd-new at baikalelectronics.ru Received: from mail.baikalelectronics.ru ([127.0.0.1]) by localhost (mail.baikalelectronics.ru [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 0_D2A8RVi7Fp; Fri, 29 May 2020 16:12:15 +0300 (MSK) From: Serge Semin To: Mark Brown , Feng Tang , Alan Cox , Linus Walleij , Vinod Koul , Grant Likely CC: Serge Semin , Serge Semin , Georgy Vlasov , Ramil Zaripov , Alexey Malahov , Thomas Bogendoerfer , Arnd Bergmann , Andy Shevchenko , Rob Herring , , , , Subject: [PATCH v6 05/16] spi: dw: Add SPI Rx-done wait method to DMA-based transfer Date: Fri, 29 May 2020 16:11:54 +0300 Message-ID: <20200529131205.31838-6-Sergey.Semin@baikalelectronics.ru> In-Reply-To: <20200529131205.31838-1-Sergey.Semin@baikalelectronics.ru> References: <20200529131205.31838-1-Sergey.Semin@baikalelectronics.ru> MIME-Version: 1.0 X-ClientProxiedBy: MAIL.baikal.int (192.168.51.25) To mail (192.168.51.25) Sender: linux-mips-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org Having any data left in the Rx FIFO after the DMA engine claimed it has finished all DMA transactions is an abnormal situation, since the DW SPI controller driver expects to have all the data being fetched and placed into the SPI Rx buffer at that moment. In case if that has happened we hopefully assume that the DMA engine may still be doing the data fetching, thus we give it sometime to finish. If after a short period of time the data is still left in the Rx FIFO, the driver will give up waiting and return an error indicating that the SPI controller/DMA engine must have hung up or failed at some point of doing their duties. Fixes: 7063c0d942a1 ("spi/dw_spi: add DMA support") Co-developed-by: Georgy Vlasov Signed-off-by: Georgy Vlasov Signed-off-by: Serge Semin Cc: Ramil Zaripov Cc: Alexey Malahov Cc: Thomas Bogendoerfer Cc: Arnd Bergmann Cc: Andy Shevchenko Cc: Feng Tang Cc: Rob Herring Cc: linux-mips@vger.kernel.org Cc: devicetree@vger.kernel.org --- Changelog v5: - Create a dedicated patch which adds the Rx-done wait method. - Add more detailed description of the problem the patch fixes. - Wait for the SPI Rx transfer finish in the mid_spi_dma_transfer() method executed in the task context. - Use spi_delay_exec() to wait for the SPI Rx completion, since now the driver does in the kernel thread context. - Wait for a delay correlated with the APB/SSI synchronous clock rate instead of using the SPI bus clock rate. Changelog v6: - Calculate the delay with better accuracy by moving 4-multiplication to the head of the formulae: ns = 4U * NSEC_PER_SEC / dws->max_freq * nents. --- drivers/spi/spi-dw-mid.c | 48 +++++++++++++++++++++++++++++++++++++++- 1 file changed, 47 insertions(+), 1 deletion(-) diff --git a/drivers/spi/spi-dw-mid.c b/drivers/spi/spi-dw-mid.c index 846e3db91329..abd6955ad1f7 100644 --- a/drivers/spi/spi-dw-mid.c +++ b/drivers/spi/spi-dw-mid.c @@ -248,6 +248,49 @@ static struct dma_async_tx_descriptor *dw_spi_dma_prepare_tx(struct dw_spi *dws, return txdesc; } +static inline bool dw_spi_dma_rx_busy(struct dw_spi *dws) +{ + return !!(dw_readl(dws, DW_SPI_SR) & SR_RF_NOT_EMPT); +} + +static int dw_spi_dma_wait_rx_done(struct dw_spi *dws) +{ + int retry = WAIT_RETRIES; + struct spi_delay delay; + unsigned long ns, us; + u32 nents; + + /* + * It's unlikely that DMA engine is still doing the data fetching, but + * if it's let's give it some reasonable time. The timeout calculation + * is based on the synchronous APB/SSI reference clock rate, on a + * number of data entries left in the Rx FIFO, times a number of clock + * periods normally needed for a single APB read/write transaction + * without PREADY signal utilized (which is true for the DW APB SSI + * controller). + */ + nents = dw_readl(dws, DW_SPI_RXFLR); + ns = 4U * NSEC_PER_SEC / dws->max_freq * nents; + if (ns <= NSEC_PER_USEC) { + delay.unit = SPI_DELAY_UNIT_NSECS; + delay.value = ns; + } else { + us = DIV_ROUND_UP(ns, NSEC_PER_USEC); + delay.unit = SPI_DELAY_UNIT_USECS; + delay.value = clamp_val(us, 0, USHRT_MAX); + } + + while (dw_spi_dma_rx_busy(dws) && retry--) + spi_delay_exec(&delay, NULL); + + if (retry < 0) { + dev_err(&dws->master->dev, "Rx hanged up\n"); + return -EIO; + } + + return 0; +} + /* * dws->dma_chan_busy is set before the dma transfer starts, callback for rx * channel will clear a corresponding bit. @@ -358,7 +401,10 @@ static int mid_spi_dma_transfer(struct dw_spi *dws, struct spi_transfer *xfer) return ret; } - return 0; + if (rxdesc && dws->master->cur_msg->status == -EINPROGRESS) + ret = dw_spi_dma_wait_rx_done(dws); + + return ret; } static void mid_spi_dma_stop(struct dw_spi *dws)