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 f05ec4f0f1b7997896aced52be9df5ae802880d0..e424755dd5780ecf7cf736c11005178e478f3861 100644 (file)
--- a/drivers/gpu/drm/tegra/dc.c
+++ b/drivers/gpu/drm/tegra/dc.c
@@ -1571,8 +1571,30 @@ static int tegra_dc_show_regs(struct seq_file *s, void *data)
        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 55792daabbb587b80712c684742c902c1303ee65..5edae2653f09e65fcb7ff31b0fd21fde44caa7c6 100644 (file)
--- 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))