linux-kernel - Re: [PATCH v3 2/4] phy: qcom-qusb2: New driver for QUSB2 PHY on Qcom chips

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Message-ID: <20161228230150.GB17126@codeaurora.org>
Date:   Wed, 28 Dec 2016 15:01:50 -0800
From:   Stephen Boyd <sboyd@...eaurora.org>
To:     Vivek Gautam <vivek.gautam@...eaurora.org>
Cc:     robh+dt@...nel.org, kishon@...com, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, mark.rutland@....com,
        srinivas.kandagatla@...aro.org, linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH v3 2/4] phy: qcom-qusb2: New driver for QUSB2 PHY on Qcom
 chips

On 12/20, Vivek Gautam wrote:
> PHY transceiver driver for QUSB2 phy controller that provides
> HighSpeed functionality for DWC3 controller present on
> Qualcomm chipsets.
> 
> Signed-off-by: Vivek Gautam <vivek.gautam@...eaurora.org>

One comment below, but otherwise

Reviewed-by: Stephen Boyd <sboyd@...eaurora.org>

> +static void qusb2_phy_set_tune2_param(struct qusb2_phy *qphy)
> +{
> +	struct device *dev = &qphy->phy->dev;
> +	u8 *val;
> +
> +	/*
> +	 * Read efuse register having TUNE2 parameter's high nibble.
> +	 * If efuse register shows value as 0x0, or if we fail to find
> +	 * a valid efuse register settings, then use default value
> +	 * as 0xB for high nibble that we have already set while
> +	 * configuring phy.
> +	 */
> +	val = nvmem_cell_read(qphy->cell, NULL);
> +	if (IS_ERR(val) || !val[0]) {
> +		dev_dbg(dev, "failed to read a valid hs-tx trim value, %ld\n",
> +								PTR_ERR(val));

If val is 0 PTR_ERR(0) will be junk? I guess that's ok for debug
print.

> +		return;
> +	}
> +
> +	/* Fused TUNE2 value is the higher nibble only */
> +	qusb2_setbits(qphy->base + QUSB2PHY_PORT_TUNE2, val[0] << 0x4);
> +}

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