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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
This commit is contained in:
Maxime Ripard 2020-10-29 13:25:21 +01:00
parent cdf117d6d3
commit 63495f6b4a
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GPG Key ID: E3EF0D6F671851C5
1 changed files with 15 additions and 0 deletions
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15
drivers/gpu/drm/vc4/vc4_hdmi.c
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@ -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,