target/linux/bcm27xx/patches-5.15/950-0301-bcm2835-dma-only-reserve-channel-0-if-legacy-dma-dri.patch

   1 From 89036f62b573bc2df30e7b865da65454213f6720 Mon Sep 17 00:00:00 2001
   2 From: Matthias Reichl <hias@horus.com>
   3 Date: Sun, 11 Oct 2020 00:48:55 +0200
   4 Subject: [PATCH] bcm2835-dma: only reserve channel 0 if legacy dma
   5  driver is enabled
   6
   7 If CONFIG_DMA_BCM2708 isn't enabled there's no need to mask out
   8 one of the already scarce DMA channels.
   9
  10 Signed-off-by: Matthias Reichl <hias@horus.com>
  11 ---
  12  drivers/dma/bcm2835-dma.c | 2 ++
  13  1 file changed, 2 insertions(+)
  14
  15 --- a/drivers/dma/bcm2835-dma.c
  16 +++ b/drivers/dma/bcm2835-dma.c
  17 @@ -1283,6 +1283,7 @@ static int bcm2835_dma_probe(struct plat
  18                 goto err_no_dma;
  19         }
  20
  21 +#ifdef CONFIG_DMA_BCM2708
  22         /* One channel is reserved for the legacy API */
  23         if (chans_available & BCM2835_DMA_BULK_MASK) {
  24                 rc = bcm_dmaman_probe(pdev, base,
  25 @@ -1293,6 +1294,7 @@ static int bcm2835_dma_probe(struct plat
  26
  27                 chans_available &= ~BCM2835_DMA_BULK_MASK;
  28         }
  29 +#endif
  30
  31         /* And possibly one for the 40-bit DMA memcpy API */
  32         if (chans_available & od->cfg_data->chan_40bit_mask &