drm/tegra: dc: Implement CRC debugfs interface
Signed-off-by: Thierry Reding <treding@nvidia.com>
diff --git a/drivers/gpu/drm/tegra/dc.c b/drivers/gpu/drm/tegra/dc.c
index f05ec4f..e424755 100644
--- a/drivers/gpu/drm/tegra/dc.c
+++ b/drivers/gpu/drm/tegra/dc.c
@@ -1571,8 +1571,30 @@
return 0;
}
+static int tegra_dc_show_crc(struct seq_file *s, void *data)
+{
+ struct drm_info_node *node = s->private;
+ struct tegra_dc *dc = node->info_ent->data;
+ u32 value;
+
+ value = DC_COM_CRC_CONTROL_ACTIVE_DATA | DC_COM_CRC_CONTROL_ENABLE;
+ tegra_dc_writel(dc, value, DC_COM_CRC_CONTROL);
+ tegra_dc_commit(dc);
+
+ drm_crtc_wait_one_vblank(&dc->base);
+ drm_crtc_wait_one_vblank(&dc->base);
+
+ value = tegra_dc_readl(dc, DC_COM_CRC_CHECKSUM);
+ seq_printf(s, "%08x\n", value);
+
+ tegra_dc_writel(dc, 0, DC_COM_CRC_CONTROL);
+
+ return 0;
+}
+
static struct drm_info_list debugfs_files[] = {
{ "regs", tegra_dc_show_regs, 0, NULL },
+ { "crc", tegra_dc_show_crc, 0, NULL },
};
static int tegra_dc_debugfs_init(struct tegra_dc *dc, struct drm_minor *minor)
diff --git a/drivers/gpu/drm/tegra/dc.h b/drivers/gpu/drm/tegra/dc.h
index 55792da..5edae26 100644
--- a/drivers/gpu/drm/tegra/dc.h
+++ b/drivers/gpu/drm/tegra/dc.h
@@ -86,6 +86,11 @@
#define DC_CMD_REG_ACT_CONTROL 0x043
#define DC_COM_CRC_CONTROL 0x300
+#define DC_COM_CRC_CONTROL_ALWAYS (1 << 3)
+#define DC_COM_CRC_CONTROL_FULL_FRAME (0 << 2)
+#define DC_COM_CRC_CONTROL_ACTIVE_DATA (1 << 2)
+#define DC_COM_CRC_CONTROL_WAIT (1 << 1)
+#define DC_COM_CRC_CONTROL_ENABLE (1 << 0)
#define DC_COM_CRC_CHECKSUM 0x301
#define DC_COM_PIN_OUTPUT_ENABLE(x) (0x302 + (x))
#define DC_COM_PIN_OUTPUT_POLARITY(x) (0x306 + (x))