From mboxrd@z Thu Jan 1 00:00:00 1970 From: Paul Cercueil Subject: [PATCH 08/14] dmaengine: dma-jz4780: Add missing residue DTC mask Date: Tue, 3 Jul 2018 14:32:08 +0200 Message-ID: <20180703123214.23090-9-paul@crapouillou.net> References: <20180703123214.23090-1-paul@crapouillou.net> Return-path: In-Reply-To: <20180703123214.23090-1-paul@crapouillou.net> Sender: linux-kernel-owner@vger.kernel.org To: Vinod Koul , Rob Herring , Mark Rutland , Ralf Baechle , Paul Burton , James Hogan , Zubair Lutfullah Kakakhel Cc: Mathieu Malaterre , Daniel Silsby , dmaengine@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mips@linux-mips.org List-Id: devicetree@vger.kernel.org From: Daniel Silsby The 'dtc' word in jz DMA descriptors contains two fields: The lowest 24 bits are the transfer count, and upper 8 bits are the DOA offset to next descriptor. The upper 8 bits are now correctly masked off when computing residue in jz4780_dma_desc_residue(). Note that reads of the DTCn hardware reg are automatically masked this way. Signed-off-by: Daniel Silsby --- drivers/dma/dma-jz4780.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/dma/dma-jz4780.c b/drivers/dma/dma-jz4780.c index 7ee2c121948f..7b2e305e28fb 100644 --- a/drivers/dma/dma-jz4780.c +++ b/drivers/dma/dma-jz4780.c @@ -610,7 +610,8 @@ static size_t jz4780_dma_desc_residue(struct jz4780_dma_chan *jzchan, residue = 0; for (i = next_sg; i < desc->count; i++) - residue += desc->desc[i].dtc << jzchan->transfer_shift; + residue += (desc->desc[i].dtc & 0xffffff) << + jzchan->transfer_shift; if (next_sg != 0) { count = jz4780_dma_chn_readl(jzdma, jzchan->id, -- 2.18.0