From 51b9e62eb6950c762162ab7eb8390990179be067 Mon Sep 17 00:00:00 2001
From: Tomi Valkeinen <tomi.valkeinen@ti.com>
Date: Thu, 3 Jan 2019 13:59:52 +0200
Subject: [PATCH] drm/bridge: tc358767: reject modes which require too much BW
Git-commit: 51b9e62eb6950c762162ab7eb8390990179be067
Patch-mainline: v5.0-rc2
References: bsc#1051510
The current driver accepts any videomode with pclk < 154MHz. This is not
correct, as with 1 lane and/or 1.62Mbps speed not all videomodes can be
supported.
Add code to reject modes that require more bandwidth that is available.
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Reviewed-by: Andrzej Hajda <a.hajda@samsung.com>
Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190103115954.12785-6-tomi.valkeinen@ti.com
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/gpu/drm/bridge/tc358767.c | 10 ++++++++++
1 file changed, 10 insertions(+)
--- a/drivers/gpu/drm/bridge/tc358767.c
+++ b/drivers/gpu/drm/bridge/tc358767.c
@@ -1114,10 +1114,20 @@ static bool tc_bridge_mode_fixup(struct
static enum drm_mode_status tc_connector_mode_valid(struct drm_connector *connector,
struct drm_display_mode *mode)
{
+ struct tc_data *tc = connector_to_tc(connector);
+ u32 req, avail;
+ u32 bits_per_pixel = 24;
+
/* DPI interface clock limitation: upto 154 MHz */
if (mode->clock > 154000)
return MODE_CLOCK_HIGH;
+ req = mode->clock * bits_per_pixel / 8;
+ avail = tc->link.base.num_lanes * tc->link.base.rate;
+
+ if (req > avail)
+ return MODE_BAD;
+
return MODE_OK;
}