drm/msm/dpu: support setting the TE source

Make the DPU driver use the TE source specified in the DT. If none is
specified, the driver defaults to the first GPIO (mdp_vsync_p).
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Patchwork: https://patchwork.freedesktop.org/patch/598733/
Link: https://lore.kernel.org/r/20240613-dpu-handle-te-signal-v2-7-67a0116b5366@linaro.org

drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c

@@ -505,6 +505,44 @@ static void dpu_kms_wait_flush(struct msm_kms *kms, unsigned crtc_mask)
 		dpu_kms_wait_for_commit_done(kms, crtc);
 }
 
+static const char *dpu_vsync_sources[] = {
+	[DPU_VSYNC_SOURCE_GPIO_0] = "mdp_vsync_p",
+	[DPU_VSYNC_SOURCE_GPIO_1] = "mdp_vsync_s",
+	[DPU_VSYNC_SOURCE_GPIO_2] = "mdp_vsync_e",
+	[DPU_VSYNC_SOURCE_INTF_0] = "mdp_intf0",
+	[DPU_VSYNC_SOURCE_INTF_1] = "mdp_intf1",
+	[DPU_VSYNC_SOURCE_INTF_2] = "mdp_intf2",
+	[DPU_VSYNC_SOURCE_INTF_3] = "mdp_intf3",
+	[DPU_VSYNC_SOURCE_WD_TIMER_0] = "timer0",
+	[DPU_VSYNC_SOURCE_WD_TIMER_1] = "timer1",
+	[DPU_VSYNC_SOURCE_WD_TIMER_2] = "timer2",
+	[DPU_VSYNC_SOURCE_WD_TIMER_3] = "timer3",
+	[DPU_VSYNC_SOURCE_WD_TIMER_4] = "timer4",
+};
+
+static int dpu_kms_dsi_set_te_source(struct msm_display_info *info,
+				     struct msm_dsi *dsi)
+{
+	const char *te_source = msm_dsi_get_te_source(dsi);
+	int i;
+
+	if (!te_source) {
+		info->vsync_source = DPU_VSYNC_SOURCE_GPIO_0;
+		return 0;
+	}
+
+	/* we can not use match_string since dpu_vsync_sources is a sparse array */
+	for (i = 0; i < ARRAY_SIZE(dpu_vsync_sources); i++) {
+		if (dpu_vsync_sources[i] &&
+		    !strcmp(dpu_vsync_sources[i], te_source)) {
+			info->vsync_source = i;
+			return 0;
+		}
+	}
+
+	return -EINVAL;
+}
+
 static int _dpu_kms_initialize_dsi(struct drm_device *dev,
 				    struct msm_drm_private *priv,
 				    struct dpu_kms *dpu_kms)
@@ -543,7 +581,11 @@ static int _dpu_kms_initialize_dsi(struct drm_device *dev,
 
 		info.is_cmd_mode = msm_dsi_is_cmd_mode(priv->dsi[i]);
 
-		info.vsync_source = DPU_VSYNC_SOURCE_GPIO_0;
+		rc = dpu_kms_dsi_set_te_source(&info, priv->dsi[i]);
+		if (rc) {
+			DPU_ERROR("failed to identify TE source for dsi display\n");
+			return rc;
+		}
 
 		encoder = dpu_encoder_init(dev, DRM_MODE_ENCODER_DSI, &info);
 		if (IS_ERR(encoder)) {