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drm/vc4: hdmi: Move clock calculation into its own function 

The code to compute our clock rate for a given setup will be called in
multiple places in the next patches, so let's create a separate function
for it.

Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Acked-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220222164042.403112-4-maxime@cerno.tech
This commit is contained in:
Maxime Ripard 2022-02-22 17:40:38 +01:00
parent ccbf364f32
commit 595dcf4eb8
No known key found for this signature in database
GPG Key ID: E3EF0D6F671851C5
1 changed files with 37 additions and 15 deletions
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52
drivers/gpu/drm/vc4/vc4_hdmi.c
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@ -1258,6 +1258,38 @@ vc4_hdmi_encoder_clock_valid(const struct vc4_hdmi *vc4_hdmi,
return MODE_OK;
}
static unsigned long long
vc4_hdmi_encoder_compute_mode_clock(const struct drm_display_mode *mode,
unsigned int bpc)
{
unsigned long long clock = mode->clock * 1000;
if (mode->flags & DRM_MODE_FLAG_DBLCLK)
clock = clock * 2;
clock = clock * bpc;
do_div(clock, 8);
return clock;
}
static int
vc4_hdmi_encoder_compute_clock(const struct vc4_hdmi *vc4_hdmi,
struct vc4_hdmi_connector_state *vc4_state,
const struct drm_display_mode *mode,
unsigned int bpc)
{
unsigned long long clock;
clock = vc4_hdmi_encoder_compute_mode_clock(mode, bpc);
if (vc4_hdmi_encoder_clock_valid(vc4_hdmi, clock) != MODE_OK)
return -EINVAL;
vc4_state->tmds_char_rate = clock;
return 0;
}
#define WIFI_2_4GHz_CH1_MIN_FREQ 2400000000ULL
#define WIFI_2_4GHz_CH1_MAX_FREQ 2422000000ULL
@ -1270,6 +1302,7 @@ static int vc4_hdmi_encoder_atomic_check(struct drm_encoder *encoder,
struct vc4_hdmi *vc4_hdmi = encoder_to_vc4_hdmi(encoder);
unsigned long long tmds_char_rate = mode->clock * 1000;
unsigned long long tmds_bit_rate;
int ret;
if (vc4_hdmi->variant->unsupported_odd_h_timings &&
((mode->hdisplay % 2) || (mode->hsync_start % 2) ||
@ -1290,21 +1323,10 @@ static int vc4_hdmi_encoder_atomic_check(struct drm_encoder *encoder,
tmds_char_rate = mode->clock * 1000;
}
if (conn_state->max_bpc == 12) {
tmds_char_rate = tmds_char_rate * 150;
do_div(tmds_char_rate, 100);
} else if (conn_state->max_bpc == 10) {
tmds_char_rate = tmds_char_rate * 125;
do_div(tmds_char_rate, 100);
}
if (mode->flags & DRM_MODE_FLAG_DBLCLK)
tmds_char_rate = tmds_char_rate * 2;
if (vc4_hdmi_encoder_clock_valid(vc4_hdmi, tmds_char_rate) != MODE_OK)
return -EINVAL;
vc4_state->tmds_char_rate = tmds_char_rate;
ret = vc4_hdmi_encoder_compute_clock(vc4_hdmi, vc4_state, mode,
conn_state->max_bpc);
if (ret)
return ret;
return 0;
}