diff options
| author | Ville Syrjälä <ville.syrjala@linux.intel.com> | 2019-01-25 21:19:31 +0300 |
|---|---|---|
| committer | Ville Syrjälä <ville.syrjala@linux.intel.com> | 2019-01-28 16:53:32 +0300 |
| commit | 8a920e24f05802e2ed88d0454a7253449c4654c1 (patch) | |
| tree | 7ea7b9f71ce244b3f4a9ba839d908166c3cdeda6 /drivers/gpu/drm/i915/intel_tv.c | |
| parent | 6a2a94041052dd4616a56b6a9aa25dd2ad51c772 (diff) | |
| download | linux-8a920e24f05802e2ed88d0454a7253449c4654c1.tar.xz | |
drm/i915/tv: Use the scanline counter for timestamps on i965gm TV output
Just like the frame counter, the pixel counter also reads zero
all the time when the TV encoder is used. Fortunately the
scanline counter still works sufficiently well so let's use that
to correct the vblank timestamps. Otherwise the timestamps may
en up out of whack, and since we use them to guesstimate the
vblank counter value that may end up incorrect as well.
Cc: Imre Deak <imre.deak@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190125181931.19482-2-ville.syrjala@linux.intel.com
Reviewed-by: Imre Deak <imre.deak@intel.com>
Diffstat (limited to 'drivers/gpu/drm/i915/intel_tv.c')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_tv.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/intel_tv.c b/drivers/gpu/drm/i915/intel_tv.c index 78be08e2971b..751b88dde18e 100644 --- a/drivers/gpu/drm/i915/intel_tv.c +++ b/drivers/gpu/drm/i915/intel_tv.c @@ -1150,6 +1150,11 @@ intel_tv_get_config(struct intel_encoder *encoder, ypos, mode.vdisplay - ysize - ypos); adjusted_mode->crtc_clock = mode.clock; + + /* pixel counter doesn't work on i965gm TV output */ + if (IS_I965GM(dev_priv)) + adjusted_mode->private_flags |= + I915_MODE_FLAG_USE_SCANLINE_COUNTER; } static int @@ -1295,6 +1300,11 @@ intel_tv_compute_config(struct intel_encoder *encoder, drm_mode_set_crtcinfo(adjusted_mode, 0); adjusted_mode->name[0] = '\0'; + /* pixel counter doesn't work on i965gm TV output */ + if (IS_I965GM(dev_priv)) + adjusted_mode->private_flags |= + I915_MODE_FLAG_USE_SCANLINE_COUNTER; + return 0; } |