linux-kernel - Re: [PATCH v5] phy: omap-usb2-phy: disable PHY charger detect

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Date:   Sun, 23 Aug 2020 21:40:36 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Roger Quadros <rogerq@...com>
Cc:     kishon@...com, nsekhar@...com, vigneshr@...com,
        jan.kiszka@...mens.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5] phy: omap-usb2-phy: disable PHY charger detect

On 21-08-20, 11:03, Roger Quadros wrote:
> AM654x PG1.0 has a silicon bug that D+ is pulled high after POR, which
> could cause enumeration failure with some USB hubs.  Disabling the
> USB2_PHY Charger Detect function will put D+ into the normal state.
> 
> This addresses Silicon Errata:
> i2075 - "USB2PHY: USB2PHY Charger Detect is Enabled by Default Without VBUS
> Presence"
> 
> Signed-off-by: Roger Quadros <rogerq@...com>
> Tested-by: Jan Kiszka <jan.kiszka@...mens.com>
> ---
> Vinod/Kishon,
> 
> As this is an errata fix, it should be targetted for 5.9-rc cycle.
> Thanks.
> 
> cheers,
> -roger
> 
> Changelog:
> v5
> - don't use dt property to enable workaround. Use soc_device_match() instead.
> 
> v4
> - fix example to fix dt_binding_check warnings
> - '#phy-cells' -> "#phy-cells"
> - Add 'oneOf' to compatible logic to allow just "ti,omap-usb2" as valid
> 
> v3
> - Removed quotes from compatibles
> - changed property to "ti,disable-charger-det"
> 
> v2
> - Address Rob's comments on YAML schema.
> 
>  drivers/phy/ti/phy-omap-usb2.c | 70 +++++++++++++++++++++++++---------
>  1 file changed, 51 insertions(+), 19 deletions(-)
> 
> diff --git a/drivers/phy/ti/phy-omap-usb2.c b/drivers/phy/ti/phy-omap-usb2.c
> index cb2dd3230fa7..65d73142d4ec 100644
> --- a/drivers/phy/ti/phy-omap-usb2.c
> +++ b/drivers/phy/ti/phy-omap-usb2.c
> @@ -6,26 +6,31 @@
>   * Author: Kishon Vijay Abraham I <kishon@...com>
>   */
>  
> -#include <linux/module.h>
> -#include <linux/platform_device.h>
> -#include <linux/slab.h>
> -#include <linux/of.h>
> -#include <linux/io.h>
> -#include <linux/phy/omap_usb.h>
> -#include <linux/usb/phy_companion.h>
>  #include <linux/clk.h>
> -#include <linux/err.h>
> -#include <linux/pm_runtime.h>
>  #include <linux/delay.h>
> +#include <linux/err.h>
> +#include <linux/io.h>
> +#include <linux/mfd/syscon.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_platform.h>
>  #include <linux/phy/omap_control_phy.h>
> +#include <linux/phy/omap_usb.h>
>  #include <linux/phy/phy.h>
> -#include <linux/mfd/syscon.h>
> +#include <linux/platform_device.h>
> +#include <linux/pm_runtime.h>
>  #include <linux/regmap.h>
> -#include <linux/of_platform.h>
> +#include <linux/slab.h>
> +#include <linux/sys_soc.h>
> +#include <linux/usb/phy_companion.h>

Can we do reorder in a separate patch and not in a fixes patch

>  static int omap_usb2_probe(struct platform_device *pdev)
>  {
>  	struct omap_usb	*phy;
> @@ -366,14 +399,14 @@ static int omap_usb2_probe(struct platform_device *pdev)
>  	phy->mask		= phy_data->mask;
>  	phy->power_on		= phy_data->power_on;
>  	phy->power_off		= phy_data->power_off;
> +	phy->flags		= phy_data->flags;
>  
> -	if (phy_data->flags & OMAP_USB2_CALIBRATE_FALSE_DISCONNECT) {
> -		res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> -		phy->phy_base = devm_ioremap_resource(&pdev->dev, res);
> -		if (IS_ERR(phy->phy_base))
> -			return PTR_ERR(phy->phy_base);
> -		phy->flags |= OMAP_USB2_CALIBRATE_FALSE_DISCONNECT;
> -	}
> +	omap_usb2_init_errata(phy);
> +
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	phy->phy_base = devm_ioremap_resource(&pdev->dev, res);
> +	if (IS_ERR(phy->phy_base))
> +		return PTR_ERR(phy->phy_base);
>  
>  	phy->syscon_phy_power = syscon_regmap_lookup_by_phandle(node,
>  							"syscon-phy-power");
> @@ -405,7 +438,6 @@ static int omap_usb2_probe(struct platform_device *pdev)
>  		}
>  	}
>  
> -

this does not belong to this patch, pls feel free to send a separate one
for this

-- 
~Vinod