target/linux/starfive/patches-6.1/0113-dmaengine-dw-axi-dmac-Increase-polling-time-to-DMA-t.patch

   1 From 92c2dc96af79b2f181cc97157ce3ef2be5b48f4c Mon Sep 17 00:00:00 2001
   2 From: Walker Chen <walker.chen@starfivetech.com>
   3 Date: Wed, 22 Mar 2023 17:48:19 +0800
   4 Subject: [PATCH 113/122] dmaengine: dw-axi-dmac: Increase polling time to DMA
   5  transmission completion status
   6
   7 The bit DMAC_CHEN[0] is automatically cleared by hardware to disable the
   8 channel after the last AMBA transfer of the DMA transfer to the
   9 destination has completed. Software can therefore poll this bit to
  10 determine when this channel is free for a new DMA transfer.
  11 This time requires at least 40 milliseconds on JH7110 SoC, otherwise an
  12 error message 'failed to stop' will be reported.
  13
  14 Signed-off-by: Walker Chen <walker.chen@starfivetech.com>
  15 ---
  16  drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c | 2 +-
  17  1 file changed, 1 insertion(+), 1 deletion(-)
  18
  19 --- a/drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c
  20 +++ b/drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c
  21 @@ -1147,7 +1147,7 @@ static int dma_chan_terminate_all(struct
  22         axi_chan_disable(chan);
  23
  24         ret = readl_poll_timeout_atomic(chan->chip->regs + DMAC_CHEN, val,
  25 -                                       !(val & chan_active), 1000, 10000);
  26 +                                       !(val & chan_active), 1000, 50000);
  27         if (ret == -ETIMEDOUT)
  28                 dev_warn(dchan2dev(dchan),
  29                          "%s failed to stop\n", axi_chan_name(chan));