Re: [PATCH 2/5] phy: qcom: edp: Introduce aux_cfg array for version specific aux settings

[Soutrik Mukhopadhyay <quic_mukhopad@xxxxxxxxxxx>]

On 9/12/2024 7:15 AM, Bjorn Andersson wrote:
> On Wed, Sep 11, 2024 at 03:38:10PM +0530, Soutrik Mukhopadhyay wrote:
> > In order to support different HW versions, introduce aux_cfg array
> > to move v4 specific aux configuration settings.
> >
> > Signed-off-by: Soutrik Mukhopadhyay <quic_mukhopad@xxxxxxxxxxx>
> > ---
> >   drivers/phy/qualcomm/phy-qcom-edp.c | 34 +++++++++++++++++------------
> >   1 file changed, 20 insertions(+), 14 deletions(-)
> >
> > diff --git a/drivers/phy/qualcomm/phy-qcom-edp.c b/drivers/phy/qualcomm/phy-qcom-edp.c
> > index da2b32fb5b45..0f860a807d1b 100644
> > --- a/drivers/phy/qualcomm/phy-qcom-edp.c
> > +++ b/drivers/phy/qualcomm/phy-qcom-edp.c
> > @@ -90,6 +90,7 @@ struct phy_ver_ops {
> >   
> >   struct qcom_edp_phy_cfg {
> >   	bool is_edp;
> > +	u8 *aux_cfg;
> >   	const struct qcom_edp_swing_pre_emph_cfg *swing_pre_emph_cfg;
> >   	const struct phy_ver_ops *ver_ops;
> >   };
> > @@ -186,11 +187,14 @@ static const struct qcom_edp_swing_pre_emph_cfg edp_phy_swing_pre_emph_cfg = {
> >   	.pre_emphasis_hbr3_hbr2 = &edp_pre_emp_hbr2_hbr3,
> >   };
> >   
> > +static u8 edp_phy_aux_cfg_v4[10] = {
> > +	0x00, 0x13, 0x24, 0x00, 0x0a, 0x26, 0x0a, 0x03, 0x37, 0x03
> > +};
> > +
> >   static int qcom_edp_phy_init(struct phy *phy)
> >   {
> >   	struct qcom_edp *edp = phy_get_drvdata(phy);
> >   	int ret;
> > -	u8 cfg8;
> >   
> >   	ret = regulator_bulk_enable(ARRAY_SIZE(edp->supplies), edp->supplies);
> >   	if (ret)
> > @@ -222,22 +226,20 @@ static int qcom_edp_phy_init(struct phy *phy)
> >   	 * even needed.
> >   	 */
> >   	if (edp->cfg->swing_pre_emph_cfg && !edp->is_edp)
> > -		cfg8 = 0xb7;
> > -	else
> > -		cfg8 = 0x37;
> > +		edp->cfg->aux_cfg[8] = 0xb7;
> If you have multiple instances of the eDP PHY they will all point to the
> same edp_phy_aux_cfg_v4[], so making instance-specific modifications
> to that array will not be okay.
>
>
> Make edp_phy_aux_cfg_v4[] const to reduce the likelihood for someone
> else to make this mistake in the future and make a local copy of the
> array on the stack so that you can modify it.
>
> Regards,
> Bjorn


Sure, we will change edp_phy_aux_cfg_v4[] to const and use local copy to 
modify it.


> >   
> >   	writel(0xfc, edp->edp + DP_PHY_MODE);
> >   
> > -	writel(0x00, edp->edp + DP_PHY_AUX_CFG0);
> > -	writel(0x13, edp->edp + DP_PHY_AUX_CFG1);
> > -	writel(0x24, edp->edp + DP_PHY_AUX_CFG2);
> > -	writel(0x00, edp->edp + DP_PHY_AUX_CFG3);
> > -	writel(0x0a, edp->edp + DP_PHY_AUX_CFG4);
> > -	writel(0x26, edp->edp + DP_PHY_AUX_CFG5);
> > -	writel(0x0a, edp->edp + DP_PHY_AUX_CFG6);
> > -	writel(0x03, edp->edp + DP_PHY_AUX_CFG7);
> > -	writel(cfg8, edp->edp + DP_PHY_AUX_CFG8);
> > -	writel(0x03, edp->edp + DP_PHY_AUX_CFG9);
> > +	writel(edp->cfg->aux_cfg[0], edp->edp + DP_PHY_AUX_CFG0);
> > +	writel(edp->cfg->aux_cfg[1], edp->edp + DP_PHY_AUX_CFG1);
> > +	writel(edp->cfg->aux_cfg[2], edp->edp + DP_PHY_AUX_CFG2);
> > +	writel(edp->cfg->aux_cfg[3], edp->edp + DP_PHY_AUX_CFG3);
> > +	writel(edp->cfg->aux_cfg[4], edp->edp + DP_PHY_AUX_CFG4);
> > +	writel(edp->cfg->aux_cfg[5], edp->edp + DP_PHY_AUX_CFG5);
> > +	writel(edp->cfg->aux_cfg[6], edp->edp + DP_PHY_AUX_CFG6);
> > +	writel(edp->cfg->aux_cfg[7], edp->edp + DP_PHY_AUX_CFG7);
> > +	writel(edp->cfg->aux_cfg[8], edp->edp + DP_PHY_AUX_CFG8);
> > +	writel(edp->cfg->aux_cfg[9], edp->edp + DP_PHY_AUX_CFG9);
> >   
> >   	writel(PHY_AUX_STOP_ERR_MASK | PHY_AUX_DEC_ERR_MASK |
> >   	       PHY_AUX_SYNC_ERR_MASK | PHY_AUX_ALIGN_ERR_MASK |
> > @@ -519,16 +521,19 @@ static const struct phy_ver_ops qcom_edp_phy_ops_v4 = {
> >   };
> >   
> >   static const struct qcom_edp_phy_cfg sc7280_dp_phy_cfg = {
> > +	.aux_cfg = edp_phy_aux_cfg_v4,
> >   	.ver_ops = &qcom_edp_phy_ops_v4,
> >   };
> >   
> >   static const struct qcom_edp_phy_cfg sc8280xp_dp_phy_cfg = {
> > +	.aux_cfg = edp_phy_aux_cfg_v4,
> >   	.swing_pre_emph_cfg = &dp_phy_swing_pre_emph_cfg,
> >   	.ver_ops = &qcom_edp_phy_ops_v4,
> >   };
> >   
> >   static const struct qcom_edp_phy_cfg sc8280xp_edp_phy_cfg = {
> >   	.is_edp = true,
> > +	.aux_cfg = edp_phy_aux_cfg_v4,
> >   	.swing_pre_emph_cfg = &edp_phy_swing_pre_emph_cfg,
> >   	.ver_ops = &qcom_edp_phy_ops_v4,
> >   };
> > @@ -707,6 +712,7 @@ static const struct phy_ver_ops qcom_edp_phy_ops_v6 = {
> >   };
> >   
> >   static struct qcom_edp_phy_cfg x1e80100_phy_cfg = {
> > +	.aux_cfg = edp_phy_aux_cfg_v4,
> >   	.swing_pre_emph_cfg = &dp_phy_swing_pre_emph_cfg,
> >   	.ver_ops = &qcom_edp_phy_ops_v6,
> >   };
> > --
> > 2.17.1