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phy: qcom: edp: Introduce support for DisplayPort

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The eDP phy can be used to drive either eDP or DP output, with some
minor variations in some of the configuration and seemingly a need for
implementing swing and pre_emphasis calibration.

Introduce a config object, indicating if the phy is operating in eDP or
DP mode and swing/pre-emphasis calibration to support this.

Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20220810040745.3582985-5-bjorn.andersson@linaro.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Bjorn Andersson 2022-08-09 21:07:44 -07:00 committed by Vinod Koul
parent 5894ff12c7
commit 2300d1cb24
1 changed files with 76 additions and 4 deletions
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80
drivers/phy/qualcomm/phy-qcom-edp.c
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@ -70,8 +70,19 @@
#define TXn_TRAN_DRVR_EMP_EN 0x0078
struct qcom_edp_cfg {
bool is_dp;
/* DP PHY swing and pre_emphasis tables */
const u8 (*swing_hbr_rbr)[4][4];
const u8 (*swing_hbr3_hbr2)[4][4];
const u8 (*pre_emphasis_hbr_rbr)[4][4];
const u8 (*pre_emphasis_hbr3_hbr2)[4][4];
};
struct qcom_edp {
struct device *dev;
const struct qcom_edp_cfg *cfg;
struct phy *phy;
@ -92,7 +103,9 @@ struct qcom_edp {
static int qcom_edp_phy_init(struct phy *phy)
{
struct qcom_edp *edp = phy_get_drvdata(phy);
const struct qcom_edp_cfg *cfg = edp->cfg;
int ret;
u8 cfg8;
ret = regulator_bulk_enable(ARRAY_SIZE(edp->supplies), edp->supplies);
if (ret)
@ -117,6 +130,13 @@ static int qcom_edp_phy_init(struct phy *phy)
DP_PHY_PD_CTL_PLL_PWRDN | DP_PHY_PD_CTL_DP_CLAMP_EN,
edp->edp + DP_PHY_PD_CTL);
if (cfg && cfg->is_dp)
cfg8 = 0xb7;
else
cfg8 = 0x37;
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);
@ -125,7 +145,7 @@ static int qcom_edp_phy_init(struct phy *phy)
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(0x37, edp->edp + DP_PHY_AUX_CFG8);
writel(cfg8, edp->edp + DP_PHY_AUX_CFG8);
writel(0x03, edp->edp + DP_PHY_AUX_CFG9);
writel(PHY_AUX_STOP_ERR_MASK | PHY_AUX_DEC_ERR_MASK |
@ -142,14 +162,60 @@ static int qcom_edp_phy_init(struct phy *phy)
return ret;
}
static int qcom_edp_set_voltages(struct qcom_edp *edp, const struct phy_configure_opts_dp *dp_opts)
{
const struct qcom_edp_cfg *cfg = edp->cfg;
unsigned int v_level = 0;
unsigned int p_level = 0;
u8 ldo_config;
u8 swing;
u8 emph;
int i;
if (!cfg)
return 0;
for (i = 0; i < dp_opts->lanes; i++) {
v_level = max(v_level, dp_opts->voltage[i]);
p_level = max(p_level, dp_opts->pre[i]);
}
if (dp_opts->link_rate <= 2700) {
swing = (*cfg->swing_hbr_rbr)[v_level][p_level];
emph = (*cfg->pre_emphasis_hbr_rbr)[v_level][p_level];
} else {
swing = (*cfg->swing_hbr3_hbr2)[v_level][p_level];
emph = (*cfg->pre_emphasis_hbr3_hbr2)[v_level][p_level];
}
if (swing == 0xff || emph == 0xff)
return -EINVAL;
ldo_config = (cfg && cfg->is_dp) ? 0x1 : 0x0;
writel(ldo_config, edp->tx0 + TXn_LDO_CONFIG);
writel(swing, edp->tx0 + TXn_TX_DRV_LVL);
writel(emph, edp->tx0 + TXn_TX_EMP_POST1_LVL);
writel(ldo_config, edp->tx1 + TXn_LDO_CONFIG);
writel(swing, edp->tx1 + TXn_TX_DRV_LVL);
writel(emph, edp->tx1 + TXn_TX_EMP_POST1_LVL);
return 0;
}
static int qcom_edp_phy_configure(struct phy *phy, union phy_configure_opts *opts)
{
const struct phy_configure_opts_dp *dp_opts = &opts->dp;
struct qcom_edp *edp = phy_get_drvdata(phy);
int ret = 0;
memcpy(&edp->dp_opts, dp_opts, sizeof(*dp_opts));
return 0;
if (dp_opts->set_voltages)
ret = qcom_edp_set_voltages(edp, dp_opts);
return ret;
}
static int qcom_edp_configure_ssc(const struct qcom_edp *edp)
@ -315,7 +381,9 @@ static int qcom_edp_set_vco_div(const struct qcom_edp *edp)
static int qcom_edp_phy_power_on(struct phy *phy)
{
const struct qcom_edp *edp = phy_get_drvdata(phy);
const struct qcom_edp_cfg *cfg = edp->cfg;
u32 bias0_en, drvr0_en, bias1_en, drvr1_en;
u8 ldo_config;
int timeout;
int ret;
u32 val;
@ -332,8 +400,11 @@ static int qcom_edp_phy_power_on(struct phy *phy)
if (timeout)
return timeout;
writel(0x01, edp->tx0 + TXn_LDO_CONFIG);
writel(0x01, edp->tx1 + TXn_LDO_CONFIG);
ldo_config = (cfg && cfg->is_dp) ? 0x1 : 0x0;
writel(ldo_config, edp->tx0 + TXn_LDO_CONFIG);
writel(ldo_config, edp->tx1 + TXn_LDO_CONFIG);
writel(0x00, edp->tx0 + TXn_LANE_MODE_1);
writel(0x00, edp->tx1 + TXn_LANE_MODE_1);
@ -635,6 +706,7 @@ static int qcom_edp_phy_probe(struct platform_device *pdev)
return -ENOMEM;
edp->dev = dev;
edp->cfg = of_device_get_match_data(&pdev->dev);
edp->edp = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(edp->edp))