mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-10-28 15:20:41 +00:00
Code Issues Releases Wiki Activity

drm/tegra: falcon: Set DMACTX field on DMA transactions

Browse source 
The DMACTX field determines which context, as specified in the
TRANSCFG register, is used. While during boot it doesn't matter
which is used, later on it matters and this value is reused by
the firmware.

Signed-off-by: Mikko Perttunen <mperttunen@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Mikko Perttunen 2022-06-27 17:19:51 +03:00 committed by Thierry Reding
parent 2486254781
commit e078d8d6c3
2 changed files with 9 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

8
drivers/gpu/drm/tegra/falcon.c
View file

@ -48,6 +48,14 @@ static int falcon_copy_chunk(struct falcon *falcon,
if (target == FALCON_MEMORY_IMEM)
cmd |= FALCON_DMATRFCMD_IMEM;
/*
* Use second DMA context (i.e. the one for firmware). Strictly
* speaking, at this point both DMA contexts point to the firmware
* stream ID, but this register's value will be reused by the firmware
* for later DMA transactions, so we need to use the correct value.
*/
cmd |= FALCON_DMATRFCMD_DMACTX(1);
falcon_writel(falcon, offset, FALCON_DMATRFMOFFS);
falcon_writel(falcon, base, FALCON_DMATRFFBOFFS);
falcon_writel(falcon, cmd, FALCON_DMATRFCMD);

1
drivers/gpu/drm/tegra/falcon.h
View file

@ -50,6 +50,7 @@
#define FALCON_DMATRFCMD_IDLE (1 << 1)
#define FALCON_DMATRFCMD_IMEM (1 << 4)
#define FALCON_DMATRFCMD_SIZE_256B (6 << 8)
#define FALCON_DMATRFCMD_DMACTX(v) (((v) & 0x7) << 12)
#define FALCON_DMATRFFBOFFS 0x0000111c