| From | Greg Kroah-Hartman <> | Subject | [PATCH 5.0 067/117] drm/sun4i: DW HDMI: Lower max. supported rate for H6 | Date | Mon, 15 Apr 2019 21:00:37 +0200 |
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From: Jernej Skrabec <jernej.skrabec@siol.net>
commit cd9063757a227cf31ebf5391ccda2bf583b0806e upstream.
Currently resolutions with pixel clock higher than 340 MHz don't work with H6 HDMI controller. They just produce a blank screen.
Limit maximum pixel clock rate to 340 MHz until scrambling is supported.
Cc: stable@vger.kernel.org # 5.0 Fixes: 40bb9d3147b2 ("drm/sun4i: Add support for H6 DW HDMI controller") Signed-off-by: Jernej Skrabec <jernej.skrabec@siol.net> Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190324190609.32721-1-jernej.skrabec@siol.net Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-)
--- a/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c +++ b/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c @@ -48,8 +48,13 @@ static enum drm_mode_status sun8i_dw_hdmi_mode_valid_h6(struct drm_connector *connector, const struct drm_display_mode *mode) { - /* This is max for HDMI 2.0b (4K@60Hz) */ - if (mode->clock > 594000) + /* + * Controller support maximum of 594 MHz, which correlates to + * 4K@60Hz 4:4:4 or RGB. However, for frequencies greater than + * 340 MHz scrambling has to be enabled. Because scrambling is + * not yet implemented, just limit to 340 MHz for now. + */ + if (mode->clock > 340000) return MODE_CLOCK_HIGH; return MODE_OK;
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