From bafabb25574f935683e7294b9e8a02b006869fed Mon Sep 17 00:00:00 2001
From: Tomi Valkeinen <tomi.valkeinen@ti.com>
Date: Tue, 21 Jan 2020 11:46:55 +0200
Subject: drm/bridge: tfp410: add pclk limits
Git-commit: 9109594def49525079811a6d97a64a0c4ba2bbf7
Patch-mainline: v5.7-rc1
References: jsc#SLE-12680, jsc#SLE-12880, jsc#SLE-12882, jsc#SLE-12883, jsc#SLE-13496, jsc#SLE-15322
Add pixel clock limits to the driver as per TFP410 datasheet: min 25MHz,
max 165MHz.
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Reviewed-by: Andrzej Hajda <a.hajda@samsung.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200121094655.9092-1-tomi.valkeinen@ti.com
Signed-off-by: Patrik Jakobsson <pjakobsson@suse.de>
---
drivers/gpu/drm/bridge/ti-tfp410.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/drivers/gpu/drm/bridge/ti-tfp410.c b/drivers/gpu/drm/bridge/ti-tfp410.c
index f195a4732e0b..7d4acc4e7e55 100644
--- a/drivers/gpu/drm/bridge/ti-tfp410.c
+++ b/drivers/gpu/drm/bridge/ti-tfp410.c
@@ -168,10 +168,23 @@ static void tfp410_disable(struct drm_bridge *bridge)
gpiod_set_value_cansleep(dvi->powerdown, 1);
}
+static enum drm_mode_status tfp410_mode_valid(struct drm_bridge *bridge,
+ const struct drm_display_mode *mode)
+{
+ if (mode->clock < 25000)
+ return MODE_CLOCK_LOW;
+
+ if (mode->clock > 165000)
+ return MODE_CLOCK_HIGH;
+
+ return MODE_OK;
+}
+
static const struct drm_bridge_funcs tfp410_bridge_funcs = {
.attach = tfp410_attach,
.enable = tfp410_enable,
.disable = tfp410_disable,
+ .mode_valid = tfp410_mode_valid,
};
static void tfp410_hpd_work_func(struct work_struct *work)
--
2.28.0