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| author | Maxime Ripard <maxime@cerno.tech> | 2020-10-29 13:25:21 +0100 |
|---|---|---|
| committer | Maxime Ripard <maxime@cerno.tech> | 2020-11-19 14:29:13 +0100 |
| commit | 63495f6b4aede26e6f8fe3da69e5cfdd8a4ccc3b (patch) | |
| tree | e49b493d62f41a1702ed4bd2bc4fefbf25411be6 /drivers/gpu/drm/vc4/vc4_hdmi.c | |
| parent | cdf117d6d38a127026e74114d63f32972f620c06 (diff) | |
| download | linux-63495f6b4aede26e6f8fe3da69e5cfdd8a4ccc3b.tar.gz linux-63495f6b4aede26e6f8fe3da69e5cfdd8a4ccc3b.tar.bz2 linux-63495f6b4aede26e6f8fe3da69e5cfdd8a4ccc3b.zip | |
drm/vc4: hdmi: Make sure our clock rate is within limits
The HDMI controller cannot go above a certain pixel rate limit depending on
the generations, but that limit is only enforced in mode_valid at the
moment, which means that we won't advertise modes that exceed that limit,
but the userspace is still free to try to setup a mode that would.
Implement atomic_check to make sure we check it in that scenario too.
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Reviewed-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20201029122522.1917579-1-maxime@cerno.tech
Diffstat (limited to 'drivers/gpu/drm/vc4/vc4_hdmi.c')
| -rw-r--r-- | drivers/gpu/drm/vc4/vc4_hdmi.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c index 95779d50cca0..600dd6d40309 100644 --- a/drivers/gpu/drm/vc4/vc4_hdmi.c +++ b/drivers/gpu/drm/vc4/vc4_hdmi.c @@ -760,6 +760,20 @@ static void vc4_hdmi_encoder_enable(struct drm_encoder *encoder) { } +static int vc4_hdmi_encoder_atomic_check(struct drm_encoder *encoder, + struct drm_crtc_state *crtc_state, + struct drm_connector_state *conn_state) +{ + struct drm_display_mode *mode = &crtc_state->adjusted_mode; + struct vc4_hdmi *vc4_hdmi = encoder_to_vc4_hdmi(encoder); + unsigned long long pixel_rate = mode->clock * 1000; + + if (pixel_rate > vc4_hdmi->variant->max_pixel_clock) + return -EINVAL; + + return 0; +} + static enum drm_mode_status vc4_hdmi_encoder_mode_valid(struct drm_encoder *encoder, const struct drm_display_mode *mode) @@ -773,6 +787,7 @@ vc4_hdmi_encoder_mode_valid(struct drm_encoder *encoder, } static const struct drm_encoder_helper_funcs vc4_hdmi_encoder_helper_funcs = { + .atomic_check = vc4_hdmi_encoder_atomic_check, .mode_valid = vc4_hdmi_encoder_mode_valid, .disable = vc4_hdmi_encoder_disable, .enable = vc4_hdmi_encoder_enable, |