From 60b7ddb0b3c9d906a20d8a84e527ccf5a792a64b Mon Sep 17 00:00:00 2001 From: Maxime Ripard Date: Thu, 2 Dec 2021 17:04:18 +0100 Subject: [PATCH] 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 --- drivers/gpu/drm/vc4/vc4_hdmi.c | 49 +++++++++++++++++++++++----------- 1 file changed, 34 insertions(+), 15 deletions(-) --- a/drivers/gpu/drm/vc4/vc4_hdmi.c +++ b/drivers/gpu/drm/vc4/vc4_hdmi.c @@ -1265,6 +1265,35 @@ vc4_hdmi_encoder_clock_valid(const struc 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->crtc_clock * 1000; + + if (mode->flags & DRM_MODE_FLAG_DBLCLK) + clock = clock * 2; + + return clock * bpc / 8; +} + +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->pixel_rate = clock; + + return 0; +} + #define WIFI_2_4GHz_CH1_MIN_FREQ 2400000000ULL #define WIFI_2_4GHz_CH1_MAX_FREQ 2422000000ULL @@ -1277,6 +1306,7 @@ static int vc4_hdmi_encoder_atomic_check struct vc4_hdmi *vc4_hdmi = encoder_to_vc4_hdmi(encoder); unsigned long long pixel_rate = mode->clock * 1000; unsigned long long tmds_rate; + int ret; if (vc4_hdmi->variant->unsupported_odd_h_timings && !(mode->flags & DRM_MODE_FLAG_DBLCLK) && @@ -1298,21 +1328,10 @@ static int vc4_hdmi_encoder_atomic_check pixel_rate = mode->clock * 1000; } - if (conn_state->max_bpc == 12) { - pixel_rate = pixel_rate * 150; - do_div(pixel_rate, 100); - } else if (conn_state->max_bpc == 10) { - pixel_rate = pixel_rate * 125; - do_div(pixel_rate, 100); - } - - if (mode->flags & DRM_MODE_FLAG_DBLCLK) - pixel_rate = pixel_rate * 2; - - if (vc4_hdmi_encoder_clock_valid(vc4_hdmi, pixel_rate) != MODE_OK) - return -EINVAL; - - vc4_state->pixel_rate = pixel_rate; + ret = vc4_hdmi_encoder_compute_clock(vc4_hdmi, vc4_state, mode, + conn_state->max_bpc); + if (ret) + return ret; return 0; }