lkml.org 
[lkml]   [2013]   [Jul]   [30]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH] host1x: hdmi: Make sure clock is enabled before dumping registers
Date
The debugfs register dumping function did not enable the HDMI clock.
This led to a possible system hang when reading the debugfs entry
while no HDMI cable was connected to the system. This patch makes
sure that the clock is enabled during the read.

Signed-off-by: Mikko Perttunen <mperttunen@nvidia.com>
---
drivers/gpu/host1x/drm/hdmi.c | 7 +++++++
1 file changed, 7 insertions(+)

diff --git a/drivers/gpu/host1x/drm/hdmi.c b/drivers/gpu/host1x/drm/hdmi.c
index 01097da..bf7f027 100644
--- a/drivers/gpu/host1x/drm/hdmi.c
+++ b/drivers/gpu/host1x/drm/hdmi.c
@@ -904,6 +904,11 @@ static int tegra_hdmi_show_regs(struct seq_file *s, void *data)
{
struct drm_info_node *node = s->private;
struct tegra_hdmi *hdmi = node->info_ent->data;
+ int err;
+
+ err = clk_enable(hdmi->clk);
+ if (err)
+ return err;

#define DUMP_REG(name) \
seq_printf(s, "%-56s %#05x %08lx\n", #name, name, \
@@ -1069,6 +1074,8 @@ static int tegra_hdmi_show_regs(struct seq_file *s, void *data)

#undef DUMP_REG

+ clk_disable(hdmi->clk);
+
return 0;
}

--
1.8.1.5


\
 
 \ /
  Last update: 2013-07-30 10:41    [W:0.037 / U:0.200 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site