linux-kernel - Re: [PATCH 2/2] phy: qcom: Introduce new eDP PHY driver

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Message-ID: <YJ5TlcwcxV4E+jyh@vkoul-mobl.Dlink>
Date:   Fri, 14 May 2021 16:10:21 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     Andy Gross <agross@...nel.org>,
        Kishon Vijay Abraham I <kishon@...com>,
        Rob Herring <robh+dt@...nel.org>, sbillaka@...eaurora.org,
        Rob Clark <robdclark@...il.com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Stephen Boyd <swboyd@...omium.org>,
        linux-arm-msm@...r.kernel.org, linux-phy@...ts.infradead.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] phy: qcom: Introduce new eDP PHY driver

On 10-05-21, 23:19, Bjorn Andersson wrote:

> +static int qcom_edp_phy_power_on(struct phy *phy)
> +{
> +	struct qcom_edp *edp = phy_get_drvdata(phy);
> +	int timeout;
> +	int ret;
> +	u32 val;
> +
> +	writel(DP_PHY_PD_CTL_PWRDN | DP_PHY_PD_CTL_AUX_PWRDN |
> +	       DP_PHY_PD_CTL_LANE_0_1_PWRDN | DP_PHY_PD_CTL_LANE_2_3_PWRDN |
> +	       DP_PHY_PD_CTL_PLL_PWRDN | DP_PHY_PD_CTL_DP_CLAMP_EN,
> +	       edp->edp + DP_PHY_PD_CTL);
> +	writel(0xfc, edp->edp + DP_PHY_MODE);
> +
> +	timeout = readl_poll_timeout(edp->pll + QSERDES_COM_CMN_STATUS,
> +				     val, val & BIT(7), 5, 200);
> +	if (timeout)
> +		return timeout;
> +
> +	writel(0x01, edp->tx0 + TXn_LDO_CONFIG);
> +	writel(0x01, edp->tx1 + TXn_LDO_CONFIG);
> +	writel(0x00, edp->tx0 + TXn_LANE_MODE_1);
> +	writel(0x00, edp->tx1 + TXn_LANE_MODE_1);
> +
> +	ret = qcom_edp_configure_ssc(edp);
> +	if (ret)
> +		return ret;
> +
> +	ret = qcom_edp_configure_pll(edp);
> +	if (ret)
> +		return ret;
> +
> +	/* TX Lane configuration */
> +	writel(0x05, edp->edp + DP_PHY_TX0_TX1_LANE_CTL);
> +	writel(0x05, edp->edp + DP_PHY_TX2_TX3_LANE_CTL);
> +
> +	/* TX-0 register configuration */
> +	writel(0x03, edp->tx0 + TXn_TRANSCEIVER_BIAS_EN);
> +	writel(0x0f, edp->tx0 + TXn_CLKBUF_ENABLE);
> +	writel(0x03, edp->tx0 + TXn_RESET_TSYNC_EN);
> +	writel(0x01, edp->tx0 + TXn_TRAN_DRVR_EMP_EN);
> +	writel(0x04, edp->tx0 + TXn_TX_BAND);
> +
> +	/* TX-1 register configuration */
> +	writel(0x03, edp->tx1 + TXn_TRANSCEIVER_BIAS_EN);
> +	writel(0x0f, edp->tx1 + TXn_CLKBUF_ENABLE);
> +	writel(0x03, edp->tx1 + TXn_RESET_TSYNC_EN);
> +	writel(0x01, edp->tx1 + TXn_TRAN_DRVR_EMP_EN);
> +	writel(0x04, edp->tx1 + TXn_TX_BAND);
> +
> +	ret = qcom_edp_set_vco_div(edp);
> +	if (ret)
> +		return ret;
> +
> +	writel(0x01, edp->edp + DP_PHY_CFG);
> +        writel(0x05, edp->edp + DP_PHY_CFG);
> +        writel(0x01, edp->edp + DP_PHY_CFG);
> +        writel(0x09, edp->edp + DP_PHY_CFG);
> +
> +        writel(0x20, edp->pll + QSERDES_COM_RESETSM_CNTRL);	
> +
> +	timeout = readl_poll_timeout(edp->pll + QSERDES_COM_C_READY_STATUS,
> +				     val, val & BIT(0), 500, 10000);
> +	if (timeout)
> +		return timeout;
> +
> +	writel(0x19, edp->edp + DP_PHY_CFG);
> +	writel(0x1f, edp->tx0 + TXn_HIGHZ_DRVR_EN);
> +	writel(0x04, edp->tx0 + TXn_HIGHZ_DRVR_EN);
> +	writel(0x00, edp->tx0 + TXn_TX_POL_INV);
> +	writel(0x1f, edp->tx1 + TXn_HIGHZ_DRVR_EN);
> +	writel(0x04, edp->tx1 + TXn_HIGHZ_DRVR_EN);
> +	writel(0x00, edp->tx1 + TXn_TX_POL_INV);
> +	writel(0x10, edp->tx0 + TXn_TX_DRV_LVL_OFFSET);
> +	writel(0x10, edp->tx1 + TXn_TX_DRV_LVL_OFFSET);
> +	writel(0x11, edp->tx0 + TXn_RES_CODE_LANE_OFFSET_TX0);
> +	writel(0x11, edp->tx0 + TXn_RES_CODE_LANE_OFFSET_TX1);
> +	writel(0x11, edp->tx1 + TXn_RES_CODE_LANE_OFFSET_TX0);
> +	writel(0x11, edp->tx1 + TXn_RES_CODE_LANE_OFFSET_TX1);
> +
> +	writel(0x10, edp->tx0 + TXn_TX_EMP_POST1_LVL);
> +	writel(0x10, edp->tx1 + TXn_TX_EMP_POST1_LVL);
> +	writel(0x1f, edp->tx0 + TXn_TX_DRV_LVL);
> +	writel(0x1f, edp->tx1 + TXn_TX_DRV_LVL);
> +
> +	writel(0x4, edp->tx0 + TXn_HIGHZ_DRVR_EN);
> +	writel(0x3, edp->tx0 + TXn_TRANSCEIVER_BIAS_EN);
> +	writel(0x4, edp->tx1 + TXn_HIGHZ_DRVR_EN);
> +	writel(0x0, edp->tx1 + TXn_TRANSCEIVER_BIAS_EN);
> +	writel(0x3, edp->edp + DP_PHY_CFG_1);
> +
> +	writel(0x18, edp->edp + DP_PHY_CFG);

Can't help but think that this should be made modular. We would come up
with next set which would have different set of sequence/values so
having a qmp style table here would be better..

-- 
~Vinod