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drm/sun4i: dw-hdmi: Fix max. frequency for H6

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[ Upstream commit 1926a0508d ]

It turns out that reasoning for lowering max. supported frequency is
wrong. Scrambling works just fine. Several now fixed bugs prevented
proper functioning, even with rates lower than 340 MHz. Issues were just
more pronounced with higher frequencies.

Fix that by allowing max. supported frequency in HW and fix the comment.

Fixes: cd9063757a ("drm/sun4i: DW HDMI: Lower max. supported rate for H6")
Reviewed-by: Chen-Yu Tsai <wens@csie.org>
Tested-by: Andre Heider <a.heider@gmail.com>
Signed-off-by: Jernej Skrabec <jernej.skrabec@siol.net>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://patchwork.freedesktop.org/patch/msgid/20210209175900.7092-6-jernej.skrabec@siol.net
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Jernej Skrabec 2021-02-09 18:59:00 +01:00 committed by Greg Kroah-Hartman
parent 40db7dba50
commit b02db23d26
1 changed files with 2 additions and 4 deletions
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6
drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c
View file

@ -49,11 +49,9 @@ sun8i_dw_hdmi_mode_valid_h6(struct drm_connector *connector,
{
/*
* 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.
* 4K@60Hz 4:4:4 or RGB.
*/
if (mode->clock > 340000)
if (mode->clock > 594000)
return MODE_CLOCK_HIGH;
return MODE_OK;