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drm/rockchip: dw_hdmi: Set cur_ctr to 0 always

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Jitter was improved by lowering the MPLL bandwidth to account for high
frequency noise in the rk3288 PLL.  In each case MPLL bandwidth was
lowered only enough to get us a comfortable margin.  We believe that
lowering the bandwidth like this is safe given sufficient testing.

Signed-off-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Yakir Yang <ykk@rock-chips.com>
Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20240908145511.3331451-5-jonas@kwiboo.se
This commit is contained in:
Douglas Anderson 2024-09-08 14:55:01 +00:00 committed by Heiko Stuebner
parent b60c86d305
commit 7d324630f3
1 changed files with 1 additions and 15 deletions
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16
drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c
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@ -179,23 +179,9 @@ static const struct dw_hdmi_mpll_config rockchip_mpll_cfg[] = {
static const struct dw_hdmi_curr_ctrl rockchip_cur_ctr[] = {
/* pixelclk bpp8 bpp10 bpp12 */
{
40000000, { 0x0018, 0x0018, 0x0018 },
}, {
65000000, { 0x0028, 0x0028, 0x0028 },
}, {
66000000, { 0x0038, 0x0038, 0x0038 },
}, {
74250000, { 0x0028, 0x0038, 0x0038 },
}, {
83500000, { 0x0028, 0x0038, 0x0038 },
}, {
146250000, { 0x0038, 0x0038, 0x0038 },
}, {
148500000, { 0x0000, 0x0038, 0x0038 },
}, {
600000000, { 0x0000, 0x0000, 0x0000 },
}, {
~0UL, { 0x0000, 0x0000, 0x0000},
~0UL, { 0x0000, 0x0000, 0x0000 },
}
};