drm/rockchip: Implement CRC debugfs API

Implement the .set_crc_source() callback and call the DP helpers
accordingly to start and stop CRC capture.

This is only done if this CRTC is currently using the eDP connector.

v3: Remove superfluous check on rockchip_crtc_state->output_type

v6: Remove superfluous variable

Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Acked-by: Mark Yao <mark.yao@rock-chips.com>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Link: http://patchwork.freedesktop.org/patch/msgid/20170303133936.14964-5-tomeu.vizoso@collabora.com

diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
index 94d7b7327ff7e363f4f4d25ded0d63e628820038..17ab16c4b922609be7ee2005a12718c7126c218c 100644 (file)
--- a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
@@ -19,6 +19,7 @@
 #include <drm/drm_crtc_helper.h>
 #include <drm/drm_flip_work.h>
 #include <drm/drm_plane_helper.h>
+#include <drm/bridge/analogix_dp.h>
 
 #include <linux/kernel.h>
 #include <linux/module.h>
@@ -1111,6 +1112,45 @@ static void vop_crtc_destroy_state(struct drm_crtc *crtc,
        kfree(s);
 }
 
+static struct drm_connector *vop_get_edp_connector(struct vop *vop)
+{
+       struct drm_crtc *crtc = &vop->crtc;
+       struct drm_connector *connector;
+
+       mutex_lock(&crtc->dev->mode_config.mutex);
+       drm_for_each_connector(connector, crtc->dev)
+               if (connector->connector_type == DRM_MODE_CONNECTOR_eDP) {
+                       mutex_unlock(&crtc->dev->mode_config.mutex);
+                       return connector;
+               }
+       mutex_unlock(&crtc->dev->mode_config.mutex);
+
+       return NULL;
+}
+
+static int vop_crtc_set_crc_source(struct drm_crtc *crtc,
+                                  const char *source_name, size_t *values_cnt)
+{
+       struct vop *vop = to_vop(crtc);
+       struct drm_connector *connector;
+       int ret;
+
+       connector = vop_get_edp_connector(vop);
+       if (!connector)
+               return -EINVAL;
+
+       *values_cnt = 3;
+
+       if (source_name && strcmp(source_name, "auto") == 0)
+               ret = analogix_dp_start_crc(connector);
+       else if (!source_name)
+               ret = analogix_dp_stop_crc(connector);
+       else
+               ret = -EINVAL;
+
+       return ret;
+}
+
 static const struct drm_crtc_funcs vop_crtc_funcs = {
        .set_config = drm_atomic_helper_set_config,
        .page_flip = drm_atomic_helper_page_flip,
@@ -1120,6 +1160,7 @@ static const struct drm_crtc_funcs vop_crtc_funcs = {
        .atomic_destroy_state = vop_crtc_destroy_state,
        .enable_vblank = vop_crtc_enable_vblank,
        .disable_vblank = vop_crtc_disable_vblank,
+       .set_crc_source = vop_crtc_set_crc_source,
 };
 
 static void vop_fb_unref_worker(struct drm_flip_work *work, void *val)