[PATCH] arm64: dts: qcom: eliza: Fix disp_cc_mdss_mdp_clk_src RCG stall on Eliza EVK

[Krzysztof Kozlowski]

Eliza EVK (eliza-cqs-evk.dts) does not have display enabled, however its
Display Clock Controller is enabled and references parent clocks from
DSI PHYs.  Devices which in base DTSI do not have all required resources
available (e.g. because they are simply disabled), should not be enabled
in the first place.

Having DISPCC enabled without DSI PHYs causes clock reparenting issues
and warning on Eliza EVK:

  disp_cc_mdss_mdp_clk_src: rcg didn't update its configuration.
  WARNING: drivers/clk/qcom/clk-rcg2.c:136 at update_config+0xd4/0xe4, CPU#1: udevd/273
  ...
    update_config (drivers/clk/qcom/clk-rcg2.c:136 (discriminator 2)) (P)
    clk_rcg2_shared_disable (drivers/clk/qcom/clk-rcg2.c:1471)
    clk_rcg2_shared_init (drivers/clk/qcom/clk-rcg2.c:1540)
    __clk_register (drivers/clk/clk.c:3959 drivers/clk/clk.c:4368)
    devm_clk_hw_register (drivers/clk/clk.c:4448 (discriminator 1) drivers/clk/clk.c:4672 (discriminator 1))
    devm_clk_register_regmap (drivers/clk/qcom/clk-regmap.c:104)
    qcom_cc_really_probe (drivers/clk/qcom/common.c:418)
    qcom_cc_probe (drivers/clk/qcom/common.c:445)
    disp_cc_eliza_probe (dispcc-eliza.c:?) dispcc_eliza
    platform_probe (drivers/base/platform.c:1432)

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxxxxxxxx>
---
 arch/arm64/boot/dts/qcom/eliza-mtp.dts | 4 ++++
 arch/arm64/boot/dts/qcom/eliza.dtsi    | 1 +
 2 files changed, 5 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/eliza-mtp.dts b/arch/arm64/boot/dts/qcom/eliza-mtp.dts
index 7b42e37e5bf8..28063e952f69 100644
--- a/arch/arm64/boot/dts/qcom/eliza-mtp.dts
+++ b/arch/arm64/boot/dts/qcom/eliza-mtp.dts
@@ -425,6 +425,10 @@ vreg_l7k: ldo7 {
 	};
 };
 
+&dispcc {
+	status = "okay";
+};
+
 &gpi_dma1 {
 	status = "okay";
 };
diff --git a/arch/arm64/boot/dts/qcom/eliza.dtsi b/arch/arm64/boot/dts/qcom/eliza.dtsi
index aa72d5f042a7..5b62272e242f 100644
--- a/arch/arm64/boot/dts/qcom/eliza.dtsi
+++ b/arch/arm64/boot/dts/qcom/eliza.dtsi
@@ -3220,6 +3220,7 @@ dispcc: clock-controller@af00000 {
 			#clock-cells = <1>;
 			#reset-cells = <1>;
 			#power-domain-cells = <1>;
+			status = "disabled";
 		};
 
 		videocc: clock-controller@aaf0000 {
-- 
2.53.0