linux-kernel - Re: [PATCH v2 16/22] usb: chipidea: msm: Restore wrapper settings after reset

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Message-ID: <20160711052444.GH30448@shlinux2>
Date:	Mon, 11 Jul 2016 13:24:44 +0800
From:	Peter Chen <hzpeterchen@...il.com>
To:	Stephen Boyd <stephen.boyd@...aro.org>
Cc:	linux-usb@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
	Andy Gross <andy.gross@...aro.org>,
	Bjorn Andersson <bjorn.andersson@...aro.org>,
	Neil Armstrong <narmstrong@...libre.com>,
	Arnd Bergmann <arnd@...db.de>, Felipe Balbi <balbi@...nel.org>,
	Peter Chen <peter.chen@....com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH v2 16/22] usb: chipidea: msm: Restore wrapper settings
 after reset

On Thu, Jul 07, 2016 at 03:21:07PM -0700, Stephen Boyd wrote:
> When the RESET bit is set in the USBCMD register it resets quite
> a few of the wrapper's registers to their reset state. This
> includes the GENCONFIG and GENCONFIG2 registers. Currently this
> is done by the usb phy and ehci-msm drivers writing into the
> controller wrapper's MMIO address space. Let's consolidate the
> register writes into the wrapper driver instead so that we
> clearly split the wrapper from the phys.
> 
> Cc: Peter Chen <peter.chen@....com>
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Signed-off-by: Stephen Boyd <stephen.boyd@...aro.org>
> ---
>  drivers/usb/chipidea/ci_hdrc_msm.c | 39 ++++++++++++++++++++++++++++++++++++++
>  1 file changed, 39 insertions(+)
> 
> diff --git a/drivers/usb/chipidea/ci_hdrc_msm.c b/drivers/usb/chipidea/ci_hdrc_msm.c
> index 7708bee3ff3e..81437c8cea82 100644
> --- a/drivers/usb/chipidea/ci_hdrc_msm.c
> +++ b/drivers/usb/chipidea/ci_hdrc_msm.c
> @@ -14,11 +14,22 @@
>  #include <linux/mfd/syscon.h>
>  #include <linux/regmap.h>
>  #include <linux/io.h>
> +#include <linux/extcon.h>
> +#include <linux/of.h>
>  
>  #include "ci.h"
>  
>  #define HS_PHY_AHB_MODE			0x0098
>  
> +#define HS_PHY_GENCONFIG		0x009c
> +#define HS_PHY_TXFIFO_IDLE_FORCE_DIS	BIT(4)
> +
> +#define HS_PHY_GENCONFIG_2		0x00a0
> +#define HS_PHY_SESS_VLD_CTRL_EN		BIT(7)
> +#define HS_PHY_ULPI_TX_PKT_EN_CLR_FIX	BIT(19)
> +
> +#define HSPHY_SESS_VLD_CTRL		BIT(25)
> +

Keep alignment please

Others are ok.

Acked-by: Peter Chen <peter.chen@....com>

>  /* Vendor base starts at 0x200 beyond CI base */
>  #define HS_PHY_SEC_CTRL			0x0078
>  #define HS_PHY_DIG_CLAMP_N		BIT(16)
> @@ -29,6 +40,7 @@ struct ci_hdrc_msm {
>  	struct clk *iface_clk;
>  	struct clk *fs_clk;
>  	bool secondary_phy;
> +	bool hsic;
>  	void __iomem *base;
>  };
>  
> @@ -48,6 +60,24 @@ static void ci_hdrc_msm_notify_event(struct ci_hdrc *ci, unsigned event)
>  
>  		/* use AHB transactor, allow posted data writes */
>  		hw_write_id_reg(ci, HS_PHY_AHB_MODE, 0xffffffff, 0x8);
> +
> +		/* workaround for rx buffer collision issue */
> +		hw_write_id_reg(ci, HS_PHY_GENCONFIG,
> +				HS_PHY_TXFIFO_IDLE_FORCE_DIS, 0);
> +
> +		if (!msm_ci->hsic)
> +			hw_write_id_reg(ci, HS_PHY_GENCONFIG_2,
> +					HS_PHY_ULPI_TX_PKT_EN_CLR_FIX, 0);
> +
> +		if (ci->platdata->vbus_extcon.edev) {
> +			hw_write_id_reg(ci, HS_PHY_GENCONFIG_2,
> +					HS_PHY_SESS_VLD_CTRL_EN,
> +					HS_PHY_SESS_VLD_CTRL_EN);
> +			hw_write(ci, OP_USBCMD, HSPHY_SESS_VLD_CTRL,
> +				 HSPHY_SESS_VLD_CTRL);
> +
> +		}
> +
>  		usb_phy_init(ci->usb_phy);
>  		break;
>  	case CI_HDRC_CONTROLLER_STOPPED_EVENT:
> @@ -116,6 +146,7 @@ static int ci_hdrc_msm_probe(struct platform_device *pdev)
>  	struct reset_control *reset;
>  	struct resource *res;
>  	int ret;
> +	struct device_node *ulpi_node, *phy_node;
>  
>  	dev_dbg(&pdev->dev, "ci_hdrc_msm_probe\n");
>  
> @@ -181,6 +212,14 @@ static int ci_hdrc_msm_probe(struct platform_device *pdev)
>  	if (ret)
>  		goto err_mux;
>  
> +	ulpi_node = of_find_node_by_name(pdev->dev.of_node, "ulpi");
> +	if (ulpi_node) {
> +		phy_node = of_get_next_available_child(ulpi_node, NULL);
> +		ci->hsic = of_device_is_compatible(phy_node, "qcom,usb-hsic-phy");
> +		of_node_put(phy_node);
> +	}
> +	of_node_put(ulpi_node);
> +
>  	plat_ci = ci_hdrc_add_device(&pdev->dev, pdev->resource,
>  				     pdev->num_resources, &ci_hdrc_msm_platdata);
>  	if (IS_ERR(plat_ci)) {
> -- 
> 2.9.0.rc2.8.ga28705d
> 
> --
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-- 

Best Regards,
Peter Chen