diff options
| author | Darren Etheridge <detheridge@ti.com> | 2013-08-14 21:43:33 +0200 |
|---|---|---|
| committer | Dave Airlie <airlied@redhat.com> | 2013-08-19 09:10:54 +1000 |
| commit | a9767188678725aac99d7990025dd5b822728ba8 (patch) | |
| tree | 74fa670bc920f9193882395c8233cfcf157e4b04 /drivers/gpu/drm/tilcdc/tilcdc_slave.c | |
| parent | 179f1aa407b466c06a94f9e54abc948d1e1146e7 (diff) | |
drm/tilcdc fixup mode to workaround sync for tda998x
Add a fixup function that will flip the hsync priority and
add a hskew value that is used to shift the tda998x to the
right by a variable number of pixels depending on the mode.
This works around an issue with the sync timings that tilcdc
is outputing.
Signed-off-by: Darren Etheridge <detheridge@ti.com>
Tested-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Tested-by: Russell King <rmk_kernel@arm.linux.org.uk>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Diffstat (limited to 'drivers/gpu/drm/tilcdc/tilcdc_slave.c')
| -rw-r--r-- | drivers/gpu/drm/tilcdc/tilcdc_slave.c | 27 |
1 files changed, 26 insertions, 1 deletions
diff --git a/drivers/gpu/drm/tilcdc/tilcdc_slave.c b/drivers/gpu/drm/tilcdc/tilcdc_slave.c index dfffaf01402..23b3203d824 100644 --- a/drivers/gpu/drm/tilcdc/tilcdc_slave.c +++ b/drivers/gpu/drm/tilcdc/tilcdc_slave.c @@ -73,13 +73,38 @@ static void slave_encoder_prepare(struct drm_encoder *encoder) tilcdc_crtc_set_panel_info(encoder->crtc, &slave_info); } +static bool slave_encoder_fixup(struct drm_encoder *encoder, + const struct drm_display_mode *mode, + struct drm_display_mode *adjusted_mode) +{ + /* + * tilcdc does not generate VESA-complient sync but aligns + * VS on the second edge of HS instead of first edge. + * We use adjusted_mode, to fixup sync by aligning both rising + * edges and add HSKEW offset to let the slave encoder fix it up. + */ + adjusted_mode->hskew = mode->hsync_end - mode->hsync_start; + adjusted_mode->flags |= DRM_MODE_FLAG_HSKEW; + + if (mode->flags & DRM_MODE_FLAG_NHSYNC) { + adjusted_mode->flags |= DRM_MODE_FLAG_PHSYNC; + adjusted_mode->flags &= ~DRM_MODE_FLAG_NHSYNC; + } else { + adjusted_mode->flags |= DRM_MODE_FLAG_NHSYNC; + adjusted_mode->flags &= ~DRM_MODE_FLAG_PHSYNC; + } + + return drm_i2c_encoder_mode_fixup(encoder, mode, adjusted_mode); +} + + static const struct drm_encoder_funcs slave_encoder_funcs = { .destroy = slave_encoder_destroy, }; static const struct drm_encoder_helper_funcs slave_encoder_helper_funcs = { .dpms = drm_i2c_encoder_dpms, - .mode_fixup = drm_i2c_encoder_mode_fixup, + .mode_fixup = slave_encoder_fixup, .prepare = slave_encoder_prepare, .commit = drm_i2c_encoder_commit, .mode_set = drm_i2c_encoder_mode_set, |