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From:   =?UTF-8?q?=C5=81ukasz=20Stelmach?= <l.stelmach@samsung.com>
To:     Kukjin Kim <kgene@kernel.org>,
        Krzysztof Kozlowski <krzk@kernel.org>,
        Andi Shyti <andi@etezian.org>, Mark Brown <broonie@kernel.org>,
        linux-spi@vger.kernel.org, linux-samsung-soc@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org
Cc:     m.szyprowski@samsung.com, b.zolnierkie@samsung.com,
        =?UTF-8?q?=C5=81ukasz=20Stelmach?= <l.stelmach@samsung.com>
Subject: [PATCH v2 3/9] spi: spi-s3c64xx: Report more information when
 errors occur
Date:   Fri, 21 Aug 2020 18:13:55 +0200
Message-Id: <20200821161401.11307-4-l.stelmach@samsung.com>
In-Reply-To: <20200821161401.11307-1-l.stelmach@samsung.com>
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References: <20200821161401.11307-1-l.stelmach@samsung.com>
        <CGME20200821161405eucas1p19280babcd73926b5c22a48830f5fecd7@eucas1p1.samsung.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Report amount of pending data when a transfer stops due to errors.

Report if DMA was used to transfer data and print the status code.

Signed-off-by: Łukasz Stelmach <l.stelmach@samsung.com>
---
 drivers/spi/spi-s3c64xx.c | 22 +++++++++++++++++-----
 1 file changed, 17 insertions(+), 5 deletions(-)

diff --git a/drivers/spi/spi-s3c64xx.c b/drivers/spi/spi-s3c64xx.c
index 22bf8c75580a..3364d362ed21 100644
--- a/drivers/spi/spi-s3c64xx.c
+++ b/drivers/spi/spi-s3c64xx.c
@@ -122,6 +122,7 @@
 
 struct s3c64xx_spi_dma_data {
 	struct dma_chan *ch;
+	dma_cookie_t cookie;
 	enum dma_transfer_direction direction;
 };
 
@@ -304,7 +305,7 @@ static void prepare_dma(struct s3c64xx_spi_dma_data *dma,
 	desc->callback = s3c64xx_spi_dmacb;
 	desc->callback_param = dma;
 
-	dmaengine_submit(desc);
+	dma->cookie = dmaengine_submit(desc);
 	dma_async_issue_pending(dma->ch);
 }
 
@@ -699,17 +700,28 @@ static int s3c64xx_spi_transfer_one(struct spi_master *master,
 
 		if (status) {
 			dev_err(&spi->dev,
-				"I/O Error: rx-%d tx-%d res:rx-%c tx-%c len-%d\n",
+				"I/O Error: rx-%d tx-%d rx-%c tx-%c len-%d dma-%d res-(%d)\n",
 				xfer->rx_buf ? 1 : 0, xfer->tx_buf ? 1 : 0,
 				(sdd->state & RXBUSY) ? 'f' : 'p',
 				(sdd->state & TXBUSY) ? 'f' : 'p',
-				xfer->len);
+				xfer->len, use_dma ? 1 : 0, status);
 
 			if (use_dma) {
-				if (xfer->tx_buf && (sdd->state & TXBUSY))
+				struct dma_tx_state s;
+
+				if (xfer->tx_buf && (sdd->state & TXBUSY)) {
+					dmaengine_pause(sdd->tx_dma.ch);
+					dmaengine_tx_status(sdd->tx_dma.ch, sdd->tx_dma.cookie, &s);
 					dmaengine_terminate_all(sdd->tx_dma.ch);
-				if (xfer->rx_buf && (sdd->state & RXBUSY))
+					dev_err(&spi->dev, "TX residue: %d\n", s.residue);
+
+				}
+				if (xfer->rx_buf && (sdd->state & RXBUSY)) {
+					dmaengine_pause(sdd->rx_dma.ch);
+					dmaengine_tx_status(sdd->rx_dma.ch, sdd->rx_dma.cookie, &s);
 					dmaengine_terminate_all(sdd->rx_dma.ch);
+					dev_err(&spi->dev, "RX residue: %d\n", s.residue);
+				}
 			}
 		} else {
 			s3c64xx_flush_fifo(sdd);
-- 
2.26.2