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drm/tegra: hdmi: Make sure clock is enabled before dumping registers

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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>
Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Mikko Perttunen 2013-07-30 11:35:03 +03:00 committed by Thierry Reding
parent 3b2f64d00c
commit ccaddfe1a2
1 changed files with 7 additions and 0 deletions
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7
drivers/gpu/host1x/drm/hdmi.c
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@ -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;
}