diff options
| author | Victor Ryabukhin <vryabukhin@nvidia.com> | 2011-12-07 15:16:47 +0900 |
|---|---|---|
| committer | Varun Wadekar <vwadekar@nvidia.com> | 2011-12-15 11:52:09 +0530 |
| commit | 6992959b717c58e6bd70daa1886ed5d401f8edb2 (patch) | |
| tree | f1faf026cb29b5b070ab93eaedc6a49b081b9dd9 /drivers/video/tegra/dc/hdmi.c | |
| parent | 115a6e6335f77705055c8c71aa22fffddb5b8cfb (diff) | |
tegra: HDMI: add underscan capability exposure via sysfs
TVs/monitors which do not support underscan will crop HDMI picture.
Underscan information might be needed in userspace to adjust HDMI
resolution so that the picture will be shown correctly on such devices.
Bug 911580
Bug 912187
Change-Id: I1eec810d860e13dafef895cb85b32fd8187a4e02
Signed-off-by: Victor Ryabukhin <vryabukhin@nvidia.com>
Reviewed-on: http://git-master/r/68616
Reviewed-by: Bharat Nihalani <bnihalani@nvidia.com>
Diffstat (limited to 'drivers/video/tegra/dc/hdmi.c')
| -rw-r--r-- | drivers/video/tegra/dc/hdmi.c | 25 |
1 files changed, 24 insertions, 1 deletions
diff --git a/drivers/video/tegra/dc/hdmi.c b/drivers/video/tegra/dc/hdmi.c index e12c16851368..413a3df8c39b 100644 --- a/drivers/video/tegra/dc/hdmi.c +++ b/drivers/video/tegra/dc/hdmi.c @@ -32,6 +32,7 @@ #include <linux/workqueue.h> #include <linux/debugfs.h> #include <linux/seq_file.h> +#include <linux/device.h> #include <mach/clk.h> #include <mach/dc.h> @@ -912,11 +913,30 @@ static void tegra_dc_hdmi_resume(struct tegra_dc *dc) tegra_nvhdcp_resume(hdmi->nvhdcp); } +static ssize_t underscan_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ +#ifdef CONFIG_SWITCH + struct tegra_dc_hdmi_data *hdmi = + container_of(dev_get_drvdata(dev), struct tegra_dc_hdmi_data, hpd_switch); + + if (hdmi->edid) + return sprintf(buf, "%d\n", tegra_edid_underscan_supported(hdmi->edid)); + else + return 0; +#else + return 0; +#endif +} + +static DEVICE_ATTR(underscan, S_IRUGO | S_IWUSR, underscan_show, NULL); + static int tegra_dc_hdmi_init(struct tegra_dc *dc) { struct tegra_dc_hdmi_data *hdmi; struct resource *res; struct resource *base_res; + int ret; void __iomem *base; struct clk *clk = NULL; struct clk *disp1_clk = NULL; @@ -1038,7 +1058,10 @@ static int tegra_dc_hdmi_init(struct tegra_dc *dc) #ifdef CONFIG_SWITCH hdmi->hpd_switch.name = "hdmi"; - switch_dev_register(&hdmi->hpd_switch); + ret = switch_dev_register(&hdmi->hpd_switch); + + if (!ret) + device_create_file(hdmi->hpd_switch.dev, &dev_attr_underscan); #endif dc->out->depth = 24; |