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From: Jonas Karlman <jonas@kwiboo.se>
To: Heiko Stuebner <heiko@sntech.de>, Sandy Huang <hjc@rock-chips.com>
Cc: Jonas Karlman <jonas@kwiboo.se>,
	Kishon Vijay Abraham I <kishon@ti.com>,
	Zheng Yang <zhengyang@rock-chips.com>,
	linux-rockchip@lists.infradead.org,
	dri-devel@lists.freedesktop.org,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org
Subject: [PATCH v2 12/14] drm/rockchip: dw-hdmi: limit tmds to 340mhz on rk3228/rk3328
Date: Wed, 08 Jan 2020 21:07:52 +0000 (UTC)	[thread overview]
Message-ID: <20200108210740.28769-13-jonas@kwiboo.se> (raw)
In-Reply-To: <20200108210740.28769-1-jonas@kwiboo.se>

RK3228/RK3328 does not provide a stable hdmi signal at TMDS rates
above 371.25MHz (340MHz pixel clock).

Limit the pixel clock rate to 340MHz to provide a stable signal.
Also limit the pixel clock to the display reported max tmds clock.

Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
---
 drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c | 22 +++++++++++++++++++--
 1 file changed, 20 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c b/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c
index 45fcdce3f27f..66c14df4a680 100644
--- a/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c
+++ b/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c
@@ -237,6 +237,24 @@ dw_hdmi_rockchip_mode_valid(struct drm_connector *connector,
 	return (valid) ? MODE_OK : MODE_BAD;
 }
 
+static enum drm_mode_status
+dw_hdmi_rk3228_mode_valid(struct drm_connector *connector,
+			  const struct drm_display_mode *mode)
+{
+	struct drm_display_info *info = &connector->display_info;
+	int max_tmds_clock = max(info->max_tmds_clock, 165000);
+	int clock = mode->clock;
+
+	if (connector->ycbcr_420_allowed && drm_mode_is_420(info, mode) &&
+	    (info->color_formats & DRM_COLOR_FORMAT_YCRCB420))
+		clock /= 2;
+
+	if (clock > max_tmds_clock || clock > 340000)
+		return MODE_CLOCK_HIGH;
+
+	return MODE_OK;
+}
+
 static const struct drm_encoder_funcs dw_hdmi_rockchip_encoder_funcs = {
 	.destroy = drm_encoder_cleanup,
 };
@@ -424,7 +442,7 @@ static struct rockchip_hdmi_chip_data rk3228_chip_data = {
 };
 
 static const struct dw_hdmi_plat_data rk3228_hdmi_drv_data = {
-	.mode_valid = dw_hdmi_rockchip_mode_valid,
+	.mode_valid = dw_hdmi_rk3228_mode_valid,
 	.mpll_cfg = rockchip_mpll_cfg,
 	.cur_ctr = rockchip_cur_ctr,
 	.phy_config = rockchip_phy_config,
@@ -461,7 +479,7 @@ static struct rockchip_hdmi_chip_data rk3328_chip_data = {
 };
 
 static const struct dw_hdmi_plat_data rk3328_hdmi_drv_data = {
-	.mode_valid = dw_hdmi_rockchip_mode_valid,
+	.mode_valid = dw_hdmi_rk3228_mode_valid,
 	.mpll_cfg = rockchip_mpll_cfg,
 	.cur_ctr = rockchip_cur_ctr,
 	.phy_config = rockchip_phy_config,
-- 
2.17.1

  parent reply	other threads:[~2020-01-08 21:07 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-08 21:07 [PATCH v2 00/14] Support more HDMI modes on RK3228/RK3328 Jonas Karlman
2020-01-08 21:07 ` [PATCH v2 01/14] phy/rockchip: inno-hdmi: use correct vco_div_5 macro on rk3328 Jonas Karlman
2020-01-08 21:07 ` [PATCH v2 03/14] phy/rockchip: inno-hdmi: remove unused no_c from rk3328 recalc_rate Jonas Karlman
2020-01-08 21:07 ` [PATCH v2 02/14] phy/rockchip: inno-hdmi: round fractal pixclock in " Jonas Karlman
2020-01-08 21:07 ` [PATCH v2 04/14] phy/rockchip: inno-hdmi: do not power on rk3328 post pll on reg write Jonas Karlman
2020-01-08 21:07 ` [PATCH v2 06/14] drm/rockchip: dw-hdmi: allow high tmds bit rates Jonas Karlman
2020-01-08 21:07 ` [PATCH v2 05/14] phy/rockchip: inno-hdmi: force set_rate on power_on Jonas Karlman
2020-01-08 21:07 ` [PATCH v2 08/14] clk: rockchip: set parent rate for DCLK_VOP clock on rk3228 Jonas Karlman
2020-01-08 21:07 ` [PATCH v2 07/14] drm/rockchip: dw-hdmi: require valid vpll clock rate on rk3228/rk3328 Jonas Karlman
2020-01-08 21:07 ` [PATCH v2 10/14] arm64: dts: rockchip: add vpll clock to hdmi node on rk3328 Jonas Karlman
2020-01-08 21:07 ` [PATCH v2 11/14] ARM: dts: rockchip: add vpll clock to hdmi node on rk3228 Jonas Karlman
2020-01-08 21:07 ` [PATCH v2 09/14] arm64: dts: rockchip: increase vop clock rate on rk3328 Jonas Karlman
2020-01-08 21:07 ` Jonas Karlman [this message]
2020-01-08 21:07 ` [PATCH v2 13/14] drm/rockchip: dw-hdmi: remove unused plat_data on rk3228/rk3328 Jonas Karlman
2020-01-08 21:07 ` [PATCH v2 14/14] phy/rockchip: inno-hdmi: Support more pre-pll configuration Jonas Karlman
2020-07-07 19:53   ` Johan Jonker
2020-07-07 21:05     ` Jonas Karlman
2020-01-10 11:01 ` [PATCH v2 00/14] Support more HDMI modes on RK3228/RK3328 Kishon Vijay Abraham I
     [not found]   ` <b159ee28-213e-35d2-6d09-516abc3358bb-l0cyMroinI0@public.gmane.org>
2020-01-10 16:56     ` Jonas Karlman
2020-10-10 15:32 ` [PATCH v3 0/6] " Jonas Karlman
2020-10-10 15:32   ` [PATCH v3 1/6] phy/rockchip: inno-hdmi: use correct vco_div_5 macro on rk3328 Jonas Karlman
2020-10-10 15:32   ` [PATCH v3 2/6] phy/rockchip: inno-hdmi: round fractal pixclock in rk3328 recalc_rate Jonas Karlman
2020-10-10 15:32   ` [PATCH v3 4/6] phy/rockchip: inno-hdmi: do not power on rk3328 post pll on reg write Jonas Karlman
2020-10-10 15:32   ` [PATCH v3 3/6] phy/rockchip: inno-hdmi: remove unused no_c from rk3328 recalc_rate Jonas Karlman
2020-10-10 15:32   ` [PATCH v3 6/6] phy/rockchip: inno-hdmi: Support more pre-pll configuration Jonas Karlman
2020-10-10 15:32   ` [PATCH v3 5/6] phy/rockchip: inno-hdmi: force set_rate on power_on Jonas Karlman

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