disp: msm: dsi: skip pll clock registration for trusted vm

Trusted VM will be granted access to MDSS HW dynamically on
usecase boundary. As a result, all the attempts to access
HW before the assignment, including the probe time access
will result in Stage 2 faults. This change skips the
PLL clock registration during probe as the clocks will not
be controlled by the VM.

Change-Id: I326f4a775796cd95dcf398449b08f2682e4aca43
Signed-off-by: Jeykumar Sankaran <jsanka@codeaurora.org>

msm/dsi/dsi_pll.c

@@ -118,6 +118,7 @@ int dsi_pll_init(struct platform_device *pdev, struct dsi_pll_resource **pll)
 	int rc = 0;
 	const char *label;
 	struct dsi_pll_resource *pll_res = NULL;
+	bool in_trusted_vm = false;
 
 	if (!pdev->dev.of_node) {
 		pr_err("Invalid DSI PHY node\n");
@@ -201,6 +202,14 @@ int dsi_pll_init(struct platform_device *pdev, struct dsi_pll_resource **pll)
 		return -ENOMEM;
 	}
 
+	in_trusted_vm = of_property_read_bool(pdev->dev.of_node,
+						"qcom,dsi-pll-in-trusted-vm");
+	if (in_trusted_vm) {
+		DSI_PLL_INFO(pll_res,
+			"Bypassing PLL clock register for Trusted VM\n");
+		return rc;
+	}
+
 	rc = dsi_pll_clock_register(pdev, pll_res);
 	if (rc) {
 		DSI_PLL_ERR(pll_res, "clock register failed rc=%d\n", rc);