[PATCH 12/13] drm/i2c: tda998x: add bridge timing information

From: Russell King <rmk+kernel@armlinux.org.uk>
To: Sven Van Asbroeck <thesven73@gmail.com>,
	Mark Brown <broonie@kernel.org>,
	Peter Ujfalusi <peter.ujfalusi@ti.com>,
	Jyri Sarha <jsarha@ti.com>
Cc: David Airlie <airlied@linux.ie>, dri-devel@lists.freedesktop.org
Subject: [PATCH 12/13] drm/i2c: tda998x: add bridge timing information
Date: Tue, 11 Jun 2019 12:02:34 +0100	[thread overview]
Message-ID: <E1haeXy-0001yu-1V@rmk-PC.armlinux.org.uk> (raw)
In-Reply-To: <20190611110052.iw6qbw2yvypxus6t@shell.armlinux.org.uk>

Add bridge timing information so that bridge users can figure out the
timing parameters that are necessary for TDA998x.

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
---
 drivers/gpu/drm/i2c/tda998x_drv.c | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/drivers/gpu/drm/i2c/tda998x_drv.c b/drivers/gpu/drm/i2c/tda998x_drv.c
index 417949fc69d1..372c462323cf 100644
--- a/drivers/gpu/drm/i2c/tda998x_drv.c
+++ b/drivers/gpu/drm/i2c/tda998x_drv.c
@@ -1643,6 +1643,18 @@ static const struct drm_bridge_funcs tda998x_bridge_funcs = {
 	.enable = tda998x_bridge_enable,
 };
 
+static const struct drm_bridge_timings tda9989_timings = {
+	.sampling_edge = DRM_BUS_FLAG_PIXDATA_POSEDGE,
+	.setup_time_ps = 1500,
+	.hold_time_ps = 1000,
+};
+
+static const struct drm_bridge_timings tda19988_timings = {
+	.sampling_edge = DRM_BUS_FLAG_PIXDATA_POSEDGE,
+	.setup_time_ps = 1600,
+	.hold_time_ps = 1200,
+};
+
 /* I2C driver functions */
 
 static int tda998x_get_audio_ports(struct tda998x_priv *priv,
@@ -1948,6 +1960,17 @@ static int tda998x_create(struct device *dev)
 	priv->bridge.of_node = dev->of_node;
 #endif
 
+	switch (priv->rev) {
+	case TDA9989N2:
+	case TDA19989:
+	case TDA19989N2:
+		priv->bridge.timings = &tda9989_timings;
+		break;
+	case TDA19988:
+		priv->bridge.timings = &tda19988_timings;
+		break;
+	}
+
 	drm_bridge_add(&priv->bridge);
 
 	return 0;
-- 
2.7.4

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