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Message-ID: <dfhvmeo3pnjubgiwvakpzhzgl6uwlopyrkwuqyhfqw6jfh4mty@t4lhuh4jh6af>
Date: Tue, 9 Sep 2025 00:24:43 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Neil Armstrong <neil.armstrong@...aro.org>
Cc: Andrzej Hajda <andrzej.hajda@...el.com>, 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>, Simona Vetter <simona@...ll.ch>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>, Vinod Koul <vkoul@...nel.org>,
        Kishon Vijay Abraham I <kishon@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>,
        dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-phy@...ts.infradead.org
Subject: Re: [PATCH v3 4/5] phy: qcom: qmp-combo: get the USB3 & DisplayPort
 lanes mapping from DT

On Mon, Sep 08, 2025 at 03:04:21PM +0200, Neil Armstrong wrote:
> The QMP USB3/DP Combo PHY hosts an USB3 phy and a DP PHY on top
> of a combo glue to route either lanes to the 4 shared physical lanes.
> 
> The routing of the lanes can be:
> - 2 DP + 2 USB3
> - 4 DP
> - 2 USB3
> 
> Get the lanes mapping from DT and stop registering the USB-C
> muxes in favor of a static mode and orientation detemined
> by the lanes mapping.
> 
> This allows supporting boards with direct connection of USB3 and
> DisplayPort lanes to the QMP Combo PHY lanes, not using the
> USB-C Altmode feature.
> 
> Signed-off-by: Neil Armstrong <neil.armstrong@...aro.org>
> ---
>  drivers/phy/qualcomm/phy-qcom-qmp-combo.c | 132 ++++++++++++++++++++++++++++--
>  1 file changed, 124 insertions(+), 8 deletions(-)

Looking at the patch... Would it be possible to make it more generic? I
think some of the RockChips also have similar combo USB+DP PHY (and
similar issues). I believe, Mediatek might also have the same issue.

> diff --git a/drivers/phy/qualcomm/phy-qcom-qmp-combo.c b/drivers/phy/qualcomm/phy-qcom-qmp-combo.c
> index 7b5af30f1d028c592500e723ecd27b54ed554709..f3f91a69dc8b81e049cd06f7ab4f04baf57776cd 100644
> --- a/drivers/phy/qualcomm/phy-qcom-qmp-combo.c
> +++ b/drivers/phy/qualcomm/phy-qcom-qmp-combo.c
> @@ -13,6 +13,7 @@
>  #include <linux/module.h>
>  #include <linux/of.h>
>  #include <linux/of_address.h>
> +#include <linux/of_graph.h>
>  #include <linux/phy/phy.h>
>  #include <linux/platform_device.h>
>  #include <linux/regulator/consumer.h>
> @@ -1744,6 +1745,21 @@ static const u8 qmp_dp_v6_pre_emphasis_hbr_rbr[4][4] = {
>  	{ 0x22, 0xff, 0xff, 0xff }
>  };
>  
> +static const u32 usb3_data_lane_mapping[][2] = {
> +	[TYPEC_ORIENTATION_NORMAL] = { 1, 0 },
> +	[TYPEC_ORIENTATION_REVERSE] = { 2, 3 },
> +};
> +
> +static const u32 dp_2_data_lanes_mapping[][2] = {
> +	[TYPEC_ORIENTATION_NORMAL] = { 0, 1 },
> +	[TYPEC_ORIENTATION_REVERSE] = { 3, 2 },
> +};
> +
> +static const u32 dp_4_data_lanes_mapping[][4] = {
> +	[TYPEC_ORIENTATION_NORMAL] = { 0, 1, 2, 3 },
> +	[TYPEC_ORIENTATION_REVERSE] = { 3, 2, 1, 0 },
> +};
> +
>  struct qmp_combo;
>  
>  struct qmp_combo_offsets {
> @@ -4167,9 +4183,114 @@ static int qmp_combo_probe(struct platform_device *pdev)
>  	if (ret)
>  		goto err_node_put;
>  
> -	ret = qmp_combo_typec_register(qmp);
> -	if (ret)
> -		goto err_node_put;
> +	qmp->qmpphy_mode = QMPPHY_MODE_USB3DP;
> +
> +	if (of_find_property(dev->of_node, "mode-switch", NULL) ||
> +	    of_find_property(dev->of_node, "orientation-switch", NULL)) {
> +		ret = qmp_combo_typec_register(qmp);
> +		if (ret)
> +			goto err_node_put;
> +	} else {

At least this needs to be extracted to a function (or set of functions).

> +		enum typec_orientation usb3_orientation = TYPEC_ORIENTATION_NONE;
> +		enum typec_orientation dp_orientation = TYPEC_ORIENTATION_NONE;
> +		struct device_node *usb3_ep, *dp_ep;
> +		u32 data_lanes[4];
> +		int count, i;
> +
> +		usb3_ep = of_graph_get_endpoint_by_regs(dev->of_node, 0, 0);
> +		dp_ep = of_graph_get_endpoint_by_regs(dev->of_node, 0, 1);
> +
> +		if (usb3_ep) {
> +			ret = of_property_count_u32_elems(usb3_ep, "data-lanes");
> +			if (ret == -EINVAL)
> +				/* Property isn't here, ignore property */

In all thsese error cases we are leaking a ref count on usb3_ep and
dp_ep.

> +				goto usb3_mapping_done;
> +			if (ret < 0)
> +				goto err_node_put;
> +
> +			count = ret;
> +			if (count != 2)
> +				/* Property size is invalid, ignore property */
> +				goto usb3_mapping_done;
> +
> +			ret = of_property_read_u32_array(usb3_ep, "data-lanes", data_lanes, count);
> +			if (ret)
> +				goto err_node_put;
> +
> +			for (i = TYPEC_ORIENTATION_NORMAL; i <= TYPEC_ORIENTATION_REVERSE; i++)
> +				if (!memcmp(data_lanes, usb3_data_lane_mapping[i], sizeof(u32) * 2))
> +					break;
> +
> +			if (i >= TYPEC_ORIENTATION_REVERSE)
> +				/* Property value is invalid, ignore property */
> +				goto usb3_mapping_done;
> +
> +			usb3_orientation = i;
> +		}
> +
> +usb3_mapping_done:
> +		of_node_put(usb3_ep);
> +
> +		if (dp_ep) {
> +			ret = of_property_count_u32_elems(dp_ep, "data-lanes");
> +			if (ret == -EINVAL)
> +				/* Property isn't here, ignore property */
> +				goto dp_mapping_done;
> +			if (ret < 0)
> +				goto err_node_put;
> +
> +			count = ret;
> +			if (count != 2 && count != 4)
> +				/* Property size is invalid, ignore property */
> +				goto dp_mapping_done;
> +
> +			ret = of_property_read_u32_array(dp_ep, "data-lanes", data_lanes, count);
> +
> +			if (ret)
> +				goto err_node_put;
> +
> +			for (i = TYPEC_ORIENTATION_NORMAL; i <= TYPEC_ORIENTATION_REVERSE; i++) {
> +				switch (count) {
> +				case 2:
> +					ret = memcmp(data_lanes, dp_2_data_lanes_mapping[i],
> +						      sizeof(u32) * count);
> +					break;
> +				case 4:
> +					ret = memcmp(data_lanes, dp_4_data_lanes_mapping[i],
> +						     sizeof(u32) * count);
> +					break;
> +				}
> +
> +				if (!ret)
> +					break;
> +			}
> +
> +			if (i >= TYPEC_ORIENTATION_REVERSE)
> +				/* Property value is invalid, ignore property */
> +				goto dp_mapping_done;
> +
> +			dp_orientation = i;
> +		}
> +
> +dp_mapping_done:
> +		of_node_put(dp_ep);
> +
> +		if (dp_orientation == TYPEC_ORIENTATION_NONE &&
> +		    usb3_orientation != TYPEC_ORIENTATION_NONE) {
> +			qmp->qmpphy_mode = QMPPHY_MODE_USB3_ONLY;
> +			qmp->orientation = usb3_orientation;
> +		} else if (usb3_orientation == TYPEC_ORIENTATION_NONE &&
> +			 dp_orientation != TYPEC_ORIENTATION_NONE) {
> +			qmp->qmpphy_mode = QMPPHY_MODE_DP_ONLY;
> +			qmp->orientation = dp_orientation;
> +		} else if (dp_orientation != TYPEC_ORIENTATION_NONE &&
> +			 dp_orientation == usb3_orientation) {
> +			qmp->qmpphy_mode = QMPPHY_MODE_USB3DP;
> +			qmp->orientation = dp_orientation;
> +		} else {
> +			dev_warn(dev, "unable to determine orientation & mode from data-lanes");
> +		}
> +	}
>  
>  	ret = drm_aux_bridge_register(dev);
>  	if (ret)
> @@ -4189,11 +4310,6 @@ static int qmp_combo_probe(struct platform_device *pdev)
>  	if (ret)
>  		goto err_node_put;
>  
> -	/*
> -	 * The hw default is USB3_ONLY, but USB3+DP mode lets us more easily
> -	 * check both sub-blocks' init tables for blunders at probe time.
> -	 */
> -	qmp->qmpphy_mode = QMPPHY_MODE_USB3DP;
>  
>  	qmp->usb_phy = devm_phy_create(dev, usb_np, &qmp_combo_usb_phy_ops);
>  	if (IS_ERR(qmp->usb_phy)) {
> 
> -- 
> 2.34.1
> 

-- 
With best wishes
Dmitry

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