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| author | Mikko Perttunen <mperttunen@nvidia.com> | 2021-01-12 14:37:07 +0300 |
|---|---|---|
| committer | Thierry Reding <treding@nvidia.com> | 2021-01-15 19:16:03 +0300 |
| commit | 59e520a695e7c775d787d7108becc2662bde8061 (patch) | |
| tree | bfee6dd6c1e2e968b52410f3e5390b5e0d2e3c44 | |
| parent | 58ef3aeb9ac3b2c542d85a2e6b4af8ff12c09b68 (diff) | |
| download | linux-59e520a695e7c775d787d7108becc2662bde8061.tar.xz | |
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>
| -rw-r--r-- | drivers/gpu/drm/tegra/vic.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/gpu/drm/tegra/vic.c b/drivers/gpu/drm/tegra/vic.c index a3dbb8813faf..48e98a60ab6e 100644 --- a/drivers/gpu/drm/tegra/vic.c +++ b/drivers/gpu/drm/tegra/vic.c @@ -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); } } |