linux-kernel - [PATCH V8 03/12] dt-bindings: soc: imx: add missing clock and power-domains to imx8mp-hdmi-blk-ctrl

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Date: Sat,  3 Feb 2024 10:52:43 -0600
From: Adam Ford <aford173@...il.com>
To: linux-arm-kernel@...ts.infradead.org
Cc: marex@...x.de,
	alexander.stein@...tq-group.com,
	frieder.schrempf@...tron.de,
	Adam Ford <aford173@...il.com>,
	Andrzej Hajda <andrzej.hajda@...el.com>,
	Neil Armstrong <neil.armstrong@...aro.org>,
	Robert Foss <rfoss@...nel.org>,
	Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
	Jonas Karlman <jonas@...boo.se>,
	Jernej Skrabec <jernej.skrabec@...il.com>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	David Airlie <airlied@...il.com>,
	Daniel Vetter <daniel@...ll.ch>,
	Rob Herring <robh+dt@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>,
	NXP Linux Team <linux-imx@....com>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	Vinod Koul <vkoul@...nel.org>,
	Kishon Vijay Abraham I <kishon@...nel.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>,
	Liu Ying <victor.liu@....com>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	Lucas Stach <l.stach@...gutronix.de>,
	dri-devel@...ts.freedesktop.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-phy@...ts.infradead.org,
	linux-pm@...r.kernel.org
Subject: [PATCH V8 03/12] dt-bindings: soc: imx: add missing clock and power-domains to imx8mp-hdmi-blk-ctrl

Per guidance from the NXP downstream kernel, if the clock is
disabled before HDMI/LCDIF probe, LCDIF will not get pixel
clock from HDMI PHY and throw an error:

[CRTC:39:crtc-2] vblank wait timed out
    WARNING: CPU: 2 PID: 9 at drivers/gpu/drm/drm_atomic_helper.c:
        1634 drm_atomic_helper_wait_for_vblanks.part.0+0x23c/0x260

Fix this by adding the fdcc clock to the hdmi_blk_ctrl.  This
should be safe, since neither this power domain nor the dependent
HDMI and LCDIF drivers been enabled or added to the SoC device
tree yet.

According to Sandor Yu from NXP, "the FDCC clock is not for HDMITX
in desgin, but it is part of HDMI domain that needed by HDMITX.
So I think it is reasonable added it to the power domain driver."

The driver also supports two power domains which are missing from the binding
that also fix an issue with resuming from suspend.

Signed-off-by: Adam Ford <aford173@...il.com>
---
V2:  Update commit message to both show error and give a bit more
     background.
     Add missing power domains hdcp and hdrv as pointed out by Marek Vasut
---
 .../soc/imx/fsl,imx8mp-hdmi-blk-ctrl.yaml     | 22 ++++++++++++-------
 1 file changed, 14 insertions(+), 8 deletions(-)

diff --git a/Documentation/devicetree/bindings/soc/imx/fsl,imx8mp-hdmi-blk-ctrl.yaml b/Documentation/devicetree/bindings/soc/imx/fsl,imx8mp-hdmi-blk-ctrl.yaml
index 1be4ce2a45e8..bd1cdaa4f54b 100644
--- a/Documentation/devicetree/bindings/soc/imx/fsl,imx8mp-hdmi-blk-ctrl.yaml
+++ b/Documentation/devicetree/bindings/soc/imx/fsl,imx8mp-hdmi-blk-ctrl.yaml
@@ -27,8 +27,8 @@ properties:
     const: 1
 
   power-domains:
-    minItems: 8
-    maxItems: 8
+    minItems: 10
+    maxItems: 10
 
   power-domain-names:
     items:
@@ -40,10 +40,12 @@ properties:
       - const: trng
       - const: hdmi-tx
       - const: hdmi-tx-phy
+      - const: hdcp
+      - const: hrv
 
   clocks:
-    minItems: 4
-    maxItems: 4
+    minItems: 5
+    maxItems: 5
 
   clock-names:
     items:
@@ -51,6 +53,7 @@ properties:
       - const: axi
       - const: ref_266m
       - const: ref_24m
+      - const: fdcc
 
   interconnects:
     maxItems: 3
@@ -82,12 +85,15 @@ examples:
         clocks = <&clk IMX8MP_CLK_HDMI_APB>,
                  <&clk IMX8MP_CLK_HDMI_ROOT>,
                  <&clk IMX8MP_CLK_HDMI_REF_266M>,
-                 <&clk IMX8MP_CLK_HDMI_24M>;
-        clock-names = "apb", "axi", "ref_266m", "ref_24m";
+                 <&clk IMX8MP_CLK_HDMI_24M>,
+                 <&clk IMX8MP_CLK_HDMI_FDCC_TST>;
+        clock-names = "apb", "axi", "ref_266m", "ref_24m", "fdcc";
         power-domains = <&pgc_hdmimix>, <&pgc_hdmimix>, <&pgc_hdmimix>,
                         <&pgc_hdmimix>, <&pgc_hdmimix>, <&pgc_hdmimix>,
-                        <&pgc_hdmimix>, <&pgc_hdmi_phy>;
+                        <&pgc_hdmimix>, <&pgc_hdmi_phy>,
+                        <&pgc_hdmimix>, <&pgc_hdmimix>;
         power-domain-names = "bus", "irqsteer", "lcdif", "pai", "pvi", "trng",
-                             "hdmi-tx", "hdmi-tx-phy";
+                             "hdmi-tx", "hdmi-tx-phy",
+                             "hdcp", "hrv";
         #power-domain-cells = <1>;
     };
-- 
2.43.0