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drm/tegra: vic: Add comments on STREAMID registers 

Add comments clarifying use of the THI_STREAMID0 and THI_STREAMID1
registers.

Signed-off-by: Mikko Perttunen <mperttunen@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Mikko Perttunen 2021-01-12 13:37:07 +02:00 committed by Thierry Reding
parent 58ef3aeb9a
commit 59e520a695
1 changed files with 12 additions and 0 deletions
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12
drivers/gpu/drm/tegra/vic.c
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@ -117,7 +117,19 @@ static int vic_boot(struct vic *vic)
if (spec->num_ids > 0) {
value = spec->ids[0] & 0xffff;
/*
* STREAMID0 is used for input/output buffers.
* Initialize it to SID_VIC in case context isolation
* is not enabled, and SID_VIC is used for both firmware
* and data buffers.
*
* If context isolation is enabled, it will be
* overridden by the SETSTREAMID opcode as part of
* each job.
*/
vic_writel(vic, value, VIC_THI_STREAMID0);
/* STREAMID1 is used for firmware loading. */
vic_writel(vic, value, VIC_THI_STREAMID1);
}
}