From: Walker Chen Date: Wed, 22 Mar 2023 09:48:19 +0000 (+0800) Subject: dmaengine: dw-axi-dmac: Increase polling time to DMA transmission completion status X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=ce62432cb8bb56a5fde544d01213e952c3a92f8b;p=linux.git dmaengine: dw-axi-dmac: Increase polling time to DMA transmission completion status The bit DMAC_CHEN[0] is automatically cleared by hardware to disable the channel after the last AMBA transfer of the DMA transfer to the destination has completed. Software can therefore poll this bit to determine when this channel is free for a new DMA transfer. This time requires at least 40 milliseconds on JH7110 SoC, otherwise an error message 'failed to stop' will be reported. Signed-off-by: Walker Chen Link: https://lore.kernel.org/r/20230322094820.24738-4-walker.chen@starfivetech.com Signed-off-by: Vinod Koul --- diff --git a/drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c b/drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c index 6cfcb541d8c3f..6937cc0c0b653 100644 --- a/drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c +++ b/drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c @@ -1147,7 +1147,7 @@ static int dma_chan_terminate_all(struct dma_chan *dchan) axi_chan_disable(chan); ret = readl_poll_timeout_atomic(chan->chip->regs + DMAC_CHEN, val, - !(val & chan_active), 1000, 10000); + !(val & chan_active), 1000, 50000); if (ret == -ETIMEDOUT) dev_warn(dchan2dev(dchan), "%s failed to stop\n", axi_chan_name(chan));