[PATCH v2 1/4] phy: rockchip-typec: Set the AUX channel flip state earlier

[Douglas Anderson]

On some DP monitors we found that setting the wrong flip state on the
AUX channel could cause the monitor to stop asserting HotPlug Detect
(HPD).  Setting the right flip state caused these monitors to start
asserting HotPlug Detect again.

Here's what we believe was happening:
* We'd plug in the monitor and we'd see HPD assert
* We'd quickly see HPD deassert
* The kernel would try to init the type C PHY but would init it in USB
  mode (because there was a peripheral there but no HPD)
* Because the kernel never set the flip mode properly we'd never see
  the HPD come back.

With this change, we'll still see HPD disappear (we don't think
there's anything we can do about that), but then it will come back.

Overall we can say that it's sane to set the AUX channel flip state
even when HPD is not asserted.

NOTE: to make this change possible, I needed to do a bit of cleanup to
the tcphy_dp_aux_calibration() function so that it doesn't ever
clobber the FLIP state.  This made it very obvious that a line of code
documented as "setting bit 12" also did a bunch of other magic,
undocumented stuff.  For now I'll just break out the bits and add a
comment that this is black magic and we'll try to document
tcphy_dp_aux_calibration() better in a future CL.

ALSO NOTE: the old function used to write a bunch of hardcoded
values in _some_ cases instead of doing a read-modify-write.  One
could possibly assert that these could have had (beneficial) side
effects and thus with this new code (which always does
read-modify-write) we could have a bug.  We shouldn't need to worry,
though, since in the old code tcphy_dp_aux_calibration() was always
called following the de-assertion of "reset" the the type C PHY.
...so the type C PHY was always in default state.  TX_ANA_CTRL_REG_1
is documented to be 0x0 after reset.  This was also confirmed by
printk.

Suggested-by: Shawn Nematbakhsh <shawnn@xxxxxxxxxxxx>
Reviewed-by: Chris Zhong <zyw@xxxxxxxxxxxxxx>
Signed-off-by: Douglas Anderson <dianders@xxxxxxxxxxxx>
---

Changes in v2: None

 drivers/phy/rockchip/phy-rockchip-typec.c | 62 +++++++++++++++++++++----------
 1 file changed, 42 insertions(+), 20 deletions(-)

diff --git a/drivers/phy/rockchip/phy-rockchip-typec.c b/drivers/phy/rockchip/phy-rockchip-typec.c
index 4d2c57f21d76..342a77733207 100644
--- a/drivers/phy/rockchip/phy-rockchip-typec.c
+++ b/drivers/phy/rockchip/phy-rockchip-typec.c
@@ -443,14 +443,34 @@ static inline int property_enable(struct rockchip_typec_phy *tcphy,
 	return regmap_write(tcphy->grf_regs, reg->offset, val | mask);
 }
 
+static void tcphy_dp_aux_set_flip(struct rockchip_typec_phy *tcphy)
+{
+	u16 tx_ana_ctrl_reg_1;
+
+	/*
+	 * Select the polarity of the xcvr:
+	 * 1, Reverses the polarity (If TYPEC, Pulls ups aux_p and pull
+	 * down aux_m)
+	 * 0, Normal polarity (if TYPEC, pulls up aux_m and pulls down
+	 * aux_p)
+	 */
+	tx_ana_ctrl_reg_1 = readl(tcphy->base + TX_ANA_CTRL_REG_1);
+	if (!tcphy->flip)
+		tx_ana_ctrl_reg_1 |= BIT(12);
+	else
+		tx_ana_ctrl_reg_1 &= ~BIT(12);
+	writel(tx_ana_ctrl_reg_1, tcphy->base + TX_ANA_CTRL_REG_1);
+}
+
 static void tcphy_dp_aux_calibration(struct rockchip_typec_phy *tcphy)
 {
+	u16 tx_ana_ctrl_reg_1;
 	u16 rdata, rdata2, val;
 
 	/* disable txda_cal_latch_en for rewrite the calibration values */
-	rdata = readl(tcphy->base + TX_ANA_CTRL_REG_1);
-	val = rdata & 0xdfff;
-	writel(val, tcphy->base + TX_ANA_CTRL_REG_1);
+	tx_ana_ctrl_reg_1 = readl(tcphy->base + TX_ANA_CTRL_REG_1);
+	tx_ana_ctrl_reg_1 &= ~BIT(13);
+	writel(tx_ana_ctrl_reg_1, tcphy->base + TX_ANA_CTRL_REG_1);
 
 	/*
 	 * read a resistor calibration code from CMN_TXPUCAL_CTRL[6:0] and
@@ -472,9 +492,8 @@ static void tcphy_dp_aux_calibration(struct rockchip_typec_phy *tcphy)
 	 * Activate this signal for 1 clock cycle to sample new calibration
 	 * values.
 	 */
-	rdata = readl(tcphy->base + TX_ANA_CTRL_REG_1);
-	val = rdata | 0x2000;
-	writel(val, tcphy->base + TX_ANA_CTRL_REG_1);
+	tx_ana_ctrl_reg_1 |= BIT(13);
+	writel(tx_ana_ctrl_reg_1, tcphy->base + TX_ANA_CTRL_REG_1);
 	usleep_range(150, 200);
 
 	/* set TX Voltage Level and TX Deemphasis to 0 */
@@ -482,8 +501,10 @@ static void tcphy_dp_aux_calibration(struct rockchip_typec_phy *tcphy)
 	/* re-enable decap */
 	writel(0x100, tcphy->base + TX_ANA_CTRL_REG_2);
 	writel(0x300, tcphy->base + TX_ANA_CTRL_REG_2);
-	writel(0x2008, tcphy->base + TX_ANA_CTRL_REG_1);
-	writel(0x2018, tcphy->base + TX_ANA_CTRL_REG_1);
+	tx_ana_ctrl_reg_1 |= BIT(3);
+	writel(tx_ana_ctrl_reg_1, tcphy->base + TX_ANA_CTRL_REG_1);
+	tx_ana_ctrl_reg_1 |= BIT(4);
+	writel(tx_ana_ctrl_reg_1, tcphy->base + TX_ANA_CTRL_REG_1);
 
 	writel(0, tcphy->base + TX_ANA_CTRL_REG_5);
 
@@ -494,8 +515,10 @@ static void tcphy_dp_aux_calibration(struct rockchip_typec_phy *tcphy)
 	writel(0x1001, tcphy->base + TX_ANA_CTRL_REG_4);
 
 	/* re-enables Bandgap reference for LDO */
-	writel(0x2098, tcphy->base + TX_ANA_CTRL_REG_1);
-	writel(0x2198, tcphy->base + TX_ANA_CTRL_REG_1);
+	tx_ana_ctrl_reg_1 |= BIT(7);
+	writel(tx_ana_ctrl_reg_1, tcphy->base + TX_ANA_CTRL_REG_1);
+	tx_ana_ctrl_reg_1 |= BIT(8);
+	writel(tx_ana_ctrl_reg_1, tcphy->base + TX_ANA_CTRL_REG_1);
 
 	/*
 	 * re-enables the transmitter pre-driver, driver data selection MUX,
@@ -505,17 +528,15 @@ static void tcphy_dp_aux_calibration(struct rockchip_typec_phy *tcphy)
 	writel(0x303, tcphy->base + TX_ANA_CTRL_REG_2);
 
 	/*
-	 * BIT 12: Controls auxda_polarity, which selects the polarity of the
-	 * xcvr:
-	 * 1, Reverses the polarity (If TYPEC, Pulls ups aux_p and pull
-	 * down aux_m)
-	 * 0, Normal polarity (if TYPE_C, pulls up aux_m and pulls down
-	 * aux_p)
+	 * Do some magic undocumented stuff, some of which appears to
+	 * undo the "re-enables Bandgap reference for LDO" above.
 	 */
-	val = 0xa078;
-	if (!tcphy->flip)
-		val |= BIT(12);
-	writel(val, tcphy->base + TX_ANA_CTRL_REG_1);
+	tx_ana_ctrl_reg_1 |=  BIT(15);
+	tx_ana_ctrl_reg_1 &= ~BIT(8);
+	tx_ana_ctrl_reg_1 &= ~BIT(7);
+	tx_ana_ctrl_reg_1 |=  BIT(6);
+	tx_ana_ctrl_reg_1 |=  BIT(5);
+	writel(tx_ana_ctrl_reg_1, tcphy->base + TX_ANA_CTRL_REG_1);
 
 	writel(0, tcphy->base + TX_ANA_CTRL_REG_3);
 	writel(0, tcphy->base + TX_ANA_CTRL_REG_4);
@@ -555,6 +576,7 @@ static int tcphy_phy_init(struct rockchip_typec_phy *tcphy, u8 mode)
 	reset_control_deassert(tcphy->tcphy_rst);
 
 	property_enable(tcphy, &cfg->typec_conn_dir, tcphy->flip);
+	tcphy_dp_aux_set_flip(tcphy);
 
 	tcphy_cfg_24m(tcphy);
 
-- 
2.14.1.690.gbb1197296e-goog