1 files changed, 54 insertions, 9 deletions

diff --git a/drivers/video/tegra/dc/dc_sysfs.c b/drivers/video/tegra/dc/dc_sysfs.c
index 184353d43324..36294c60907f 100644
--- a/drivers/video/tegra/dc/dc_sysfs.c
+++ b/drivers/video/tegra/dc/dc_sysfs.c
@@ -124,6 +124,53 @@ static ssize_t enable_store(struct device *dev,
 
 static DEVICE_ATTR(enable, S_IRUGO|S_IWUSR, enable_show, enable_store);
 
+static ssize_t crc_checksum_latched_show(struct device *device,
+	struct device_attribute *attr, char *buf)
+{
+	struct nvhost_device *ndev = to_nvhost_device(device);
+	struct tegra_dc *dc = nvhost_get_drvdata(ndev);
+
+	u32 crc;
+
+	if (!dc->enabled) {
+		dev_err(&dc->ndev->dev, "Failed to get dc.\n");
+		return -EFAULT;
+	}
+
+	crc = tegra_dc_read_checksum_latched(dc);
+
+	return snprintf(buf, PAGE_SIZE, "%u", crc);
+}
+
+static ssize_t crc_checksum_latched_store(struct device *dev,
+	struct device_attribute *attr, const char *buf, size_t count)
+{
+	struct nvhost_device *ndev = to_nvhost_device(dev);
+	struct tegra_dc *dc = nvhost_get_drvdata(ndev);
+	unsigned long val = 0;
+
+	if (!dc->enabled) {
+		dev_err(&dc->ndev->dev, "Failed to get dc.\n");
+		return -EFAULT;
+	}
+
+	if (strict_strtoul(buf, 10, &val) < 0)
+		return -EINVAL;
+
+	if (val == 1) {
+		tegra_dc_enable_crc(dc);
+		dev_err(&dc->ndev->dev, "crc is enabled.\n");
+	} else if (val == 0) {
+		tegra_dc_disable_crc(dc);
+		dev_err(&dc->ndev->dev, "crc is disabled.\n");
+	} else
+		dev_err(&dc->ndev->dev, "Invalid input.\n");
+
+	return count;
+}
+static DEVICE_ATTR(crc_checksum_latched, S_IRUGO|S_IWUSR|S_IWGRP,
+		crc_checksum_latched_show, crc_checksum_latched_store);
+
 #define ORIENTATION_PORTRAIT	"portrait"
 #define ORIENTATION_LANDSCAPE	"landscape"
 
@@ -235,18 +282,18 @@ void __devexit tegra_dc_remove_sysfs(struct device *dev)
 	struct tegra_dc *dc = nvhost_get_drvdata(ndev);
 	struct tegra_dc_sd_settings *sd_settings = dc->out->sd_settings;
 
-	device_remove_file(dev, &dev_attr_stats_enable);
 	device_remove_file(dev, &dev_attr_mode);
 	device_remove_file(dev, &dev_attr_enable);
+	device_remove_file(dev, &dev_attr_stats_enable);
+	device_remove_file(dev, &dev_attr_crc_checksum_latched);
 
 	if (dc->out->stereo) {
 		device_remove_file(dev, &dev_attr_stereo_orientation);
 		device_remove_file(dev, &dev_attr_stereo_mode);
 	}
 
-	if(sd_settings) {
+	if (sd_settings)
 		nvsd_remove_sysfs(dev);
-	}
 }
 
 void tegra_dc_create_sysfs(struct device *dev)
@@ -259,18 +306,16 @@ void tegra_dc_create_sysfs(struct device *dev)
 	error |= device_create_file(dev, &dev_attr_mode);
 	error |= device_create_file(dev, &dev_attr_enable);
 	error |= device_create_file(dev, &dev_attr_stats_enable);
+	error |= device_create_file(dev, &dev_attr_crc_checksum_latched);
 
 	if (dc->out->stereo) {
 		error |= device_create_file(dev, &dev_attr_stereo_orientation);
 		error |= device_create_file(dev, &dev_attr_stereo_mode);
 	}
 
-	if(sd_settings) {
+	if (sd_settings)
 		error |= nvsd_create_sysfs(dev);
-	}
 
-	if(error) {
-		printk("Failed to create sysfs attributes!\n");
-	}
+	if (error)
+		dev_err(&ndev->dev, "Failed to create sysfs attributes!\n");
 }
-