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

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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





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