From ccaddfe1a2e10f50aa6f553f9791c2724b6d3c4a Mon Sep 17 00:00:00 2001 From: Mikko Perttunen Date: Tue, 30 Jul 2013 11:35:03 +0300 Subject: [PATCH] drm/tegra: hdmi: Make sure clock is enabled before dumping registers 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 Signed-off-by: Thierry Reding --- 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 01097da09f7f..bf7f02743419 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; } -- 2.30.2