linux-kernel - [PATCH 10/13] drm/rockchip: dw_hdmi: Set cur

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Date: Sat, 15 Jun 2024 17:04:01 +0000
From: Jonas Karlman <jonas@...boo.se>
To: dri-devel@...ts.freedesktop.org, Sandy Huang <hjc@...k-chips.com>,
 "Heiko Stübner" <heiko@...ech.de>, Andy Yan
 <andy.yan@...k-chips.com>, Maarten Lankhorst
 <maarten.lankhorst@...ux.intel.com>, Maxime Ripard <mripard@...nel.org>,
 Thomas Zimmermann <tzimmermann@...e.de>, David Airlie <airlied@...il.com>,
 Daniel Vetter <daniel@...ll.ch>
Cc: linux-arm-kernel@...ts.infradead.org,
 linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org, Jonas
 Karlman <jonas@...boo.se>, Douglas Anderson <dianders@...omium.org>, Yakir
 Yang <ykk@...k-chips.com>
Subject: [PATCH 10/13] drm/rockchip: dw_hdmi: Set cur_ctr to 0 always

From: Douglas Anderson <dianders@...omium.org>

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@...omium.org>
Signed-off-by: Yakir Yang <ykk@...k-chips.com>
Signed-off-by: Jonas Karlman <jonas@...boo.se>
---
 drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c | 16 +---------------
 1 file changed, 1 insertion(+), 15 deletions(-)

diff --git a/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c b/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c
index 9d5bd7455180..e532c6d294dc 100644
--- a/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c
+++ b/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c
@@ -181,23 +181,9 @@ 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 },
 	}
 };
 
-- 
2.45.2