[PATCH v2 2/4] phy: qcom: qmp-pcie: Add qref and refgen regulator vote for QCS8300 and SA8775p PHY

[Ziyue Zhang]

Add a new sa8775p_qmp_phy_vreg_l that includes vdda-phy, vdda-pll,
vdda-qref, vdda-refgen and refgen supplies, and use it for QCS8300
and SA8775p PCIe PHY configurations. This avoids modifying
sm8550_qmp_phy_vreg_l and breaking SM8550 and SM8650.

These supplies were missing from the original driver, which was found
to be the root cause of occasional system crashes observed on QCS8300
and SA8775p platforms. Without voting for these supplies, the PCIe PHY
lacks stable reference clock and voltage, so the PHY never becomes
ready and initialization times out:

  [    7.303119] qcom-qmp-pcie-phy 1c04000.phy: phy initialization timed-out
  [    7.309948] phy phy-1c04000.phy.0: phy poweron failed --> -110

Note that due to a hardware issue, QREF actually depends on refgen3
rather than refgen2 as documented; refgen3 is therefore voted manually
via the refgen supply as a workaround.

Fixes: a05b6d5135ec ("phy: qcom-qmp-pcie: add support for sa8775p")
Fixes: ebf198f17b5a ("phy: qcom-qmp-pcie: add dual lane PHY support for QCS8300")
Signed-off-by: Ziyue Zhang <ziyue.zhang@xxxxxxxxxxxxxxxx>
---
 drivers/phy/qualcomm/phy-qcom-qmp-pcie.c | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c b/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c
index da83358c97ea..ab81c6e584a8 100644
--- a/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c
+++ b/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c
@@ -4094,6 +4094,10 @@ static const char * const sm8550_qmp_phy_vreg_l[] = {
 	"vdda-phy", "vdda-pll", "vdda-qref",
 };
 
+static const char * const sa8775p_qmp_phy_vreg_l[] = {
+	"vdda-phy", "vdda-pll", "vdda-qref", "vdda-refgen", "refgen",
+};
+
 /* list of resets */
 static const char * const ipq8074_pciephy_reset_l[] = {
 	"phy", "common",
@@ -4585,8 +4589,8 @@ static const struct qmp_phy_cfg qcs8300_qmp_gen4x2_pciephy_cfg = {
 
 	.reset_list		= sdm845_pciephy_reset_l,
 	.num_resets		= ARRAY_SIZE(sdm845_pciephy_reset_l),
-	.vreg_list		= qmp_phy_vreg_l,
-	.num_vregs		= ARRAY_SIZE(qmp_phy_vreg_l),
+	.vreg_list		= sa8775p_qmp_phy_vreg_l,
+	.num_vregs		= ARRAY_SIZE(sa8775p_qmp_phy_vreg_l),
 	.regs			= pciephy_v5_regs_layout,
 
 	.pwrdn_ctrl		= SW_PWRDN | REFCLK_DRV_DSBL,
@@ -5324,8 +5328,8 @@ static const struct qmp_phy_cfg sa8775p_qmp_gen4x2_pciephy_cfg = {
 
 	.reset_list		= sdm845_pciephy_reset_l,
 	.num_resets		= ARRAY_SIZE(sdm845_pciephy_reset_l),
-	.vreg_list		= qmp_phy_vreg_l,
-	.num_vregs		= ARRAY_SIZE(qmp_phy_vreg_l),
+	.vreg_list		= sa8775p_qmp_phy_vreg_l,
+	.num_vregs		= ARRAY_SIZE(sa8775p_qmp_phy_vreg_l),
 	.regs			= pciephy_v5_regs_layout,
 
 	.pwrdn_ctrl		= SW_PWRDN | REFCLK_DRV_DSBL,
@@ -5365,8 +5369,8 @@ static const struct qmp_phy_cfg sa8775p_qmp_gen4x4_pciephy_cfg = {
 
 	.reset_list		= sdm845_pciephy_reset_l,
 	.num_resets		= ARRAY_SIZE(sdm845_pciephy_reset_l),
-	.vreg_list		= qmp_phy_vreg_l,
-	.num_vregs		= ARRAY_SIZE(qmp_phy_vreg_l),
+	.vreg_list		= sa8775p_qmp_phy_vreg_l,
+	.num_vregs		= ARRAY_SIZE(sa8775p_qmp_phy_vreg_l),
 	.regs			= pciephy_v5_regs_layout,
 
 	.pwrdn_ctrl		= SW_PWRDN | REFCLK_DRV_DSBL,
-- 
2.43.0