linux-kernel - [PATCH 1/2] fixup! drm/bridge: ti-sn65dsi86: Train at faster rates if slower ones fail

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Date:   Sun, 15 Dec 2019 12:04:59 -0800
From:   Rob Clark <robdclark@...il.com>
To:     Douglas Anderson <dianders@...omium.org>
Cc:     Andrzej Hajda <a.hajda@...sung.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Rob Clark <robdclark@...omium.org>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        Jonas Karlman <jonas@...boo.se>,
        David Airlie <airlied@...ux.ie>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Sean Paul <seanpaul@...omium.org>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Daniel Vetter <daniel@...ll.ch>
Subject: [PATCH 1/2] fixup! drm/bridge: ti-sn65dsi86: Train at faster rates if slower ones fail

From: Rob Clark <robdclark@...omium.org>

Fixes:

In file included from ../drivers/gpu/drm/bridge/ti-sn65dsi86.c:25:
../drivers/gpu/drm/bridge/ti-sn65dsi86.c: In function ‘ti_sn_bridge_enable’:
../include/drm/drm_print.h:339:2: warning: ‘last_err_str’ may be used uninitialized in this function [-Wmaybe-uninitialized]
  339 |  drm_dev_printk(dev, KERN_ERR, "*ERROR* " fmt, ##__VA_ARGS__)
      |  ^~~~~~~~~~~~~~
../drivers/gpu/drm/bridge/ti-sn65dsi86.c:650:14: note: ‘last_err_str’ was declared here
  650 |  const char *last_err_str;
      |              ^~~~~~~~~~~~
In file included from ../drivers/gpu/drm/bridge/ti-sn65dsi86.c:25:
../include/drm/drm_print.h:339:2: warning: ‘ret’ may be used uninitialized in this function [-Wmaybe-uninitialized]
  339 |  drm_dev_printk(dev, KERN_ERR, "*ERROR* " fmt, ##__VA_ARGS__)
      |  ^~~~~~~~~~~~~~
../drivers/gpu/drm/bridge/ti-sn65dsi86.c:654:6: note: ‘ret’ was declared here
  654 |  int ret;
      |      ^~~
  Building modules, stage 2.
---
 drivers/gpu/drm/bridge/ti-sn65dsi86.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi86.c b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
index cb774ee536cd..976f98991b3d 100644
--- a/drivers/gpu/drm/bridge/ti-sn65dsi86.c
+++ b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
@@ -618,11 +618,11 @@ static int ti_sn_link_training(struct ti_sn_bridge *pdata, int dp_rate_idx,
 static void ti_sn_bridge_enable(struct drm_bridge *bridge)
 {
 	struct ti_sn_bridge *pdata = bridge_to_ti_sn_bridge(bridge);
-	const char *last_err_str;
+	const char *last_err_str = "No supported DP rate";
 	int dp_rate_idx;
 	int max_dp_rate_idx;
 	unsigned int val;
-	int ret;
+	int ret = -EINVAL;
 
 	/*
 	 * Run with the maximum number of lanes that the DP sink supports.
-- 
2.23.0