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| author | Jernej Skrabec <jernej.skrabec@siol.net> | 2019-03-24 20:06:09 +0100 |
|---|---|---|
| committer | Maxime Ripard <maxime.ripard@bootlin.com> | 2019-04-05 10:44:10 +0200 |
| commit | cd9063757a227cf31ebf5391ccda2bf583b0806e (patch) | |
| tree | a1bcb86f0ff03c7cc057459f4876d951d1c5d798 /drivers/gpu | |
| parent | Revert "Documentation/gpu/meson: Remove link to meson_canvas.c" (diff) | |
| download | linux-cd9063757a227cf31ebf5391ccda2bf583b0806e.tar.xz linux-cd9063757a227cf31ebf5391ccda2bf583b0806e.zip | |
drm/sun4i: DW HDMI: Lower max. supported rate for H6
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
Diffstat (limited to 'drivers/gpu')
| -rw-r--r-- | drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c b/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c index dc47720c99ba..39d8509d96a0 100644 --- 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; |