[PATCH AUTOSEL 6.4 20/25] usb: chipidea: add workaround for chipidea PEC bug

Sasha Levin
2023-09-09T00:39:13Z

From: Xu Yang <xu.yang_2@nxp.com>

[ Upstream commit 12e6ac69cc7e7d3367599ae26a92a0f9a18bc728 ]

Some NXP processors using ChipIdea USB IP have a bug when frame babble is
detected.

Issue description:
In USB camera test, our controller is host in HS mode. In ISOC IN, when
device sends data across the micro frame, it causes the babble in host
controller. This will clear the PE bit. In spec, it also requires to set
the PEC bit and then set the PCI bit. Without the PCI interrupt, the
software does not know the PE is cleared.

This will add a flag CI_HDRC_HAS_PORTSC_PEC_MISSED to some impacted
platform datas. And the ehci host driver will assert PEC by SW when
specific conditions are satisfied.

Signed-off-by: Xu Yang <xu.yang_2@nxp.com>
Link: https://lore.kernel.org/r/20230809024432.535160-2-xu.yang_2@nxp.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/usb/chipidea/ci.h | 1 +
drivers/usb/chipidea/ci_hdrc_imx.c | 4 +++-
drivers/usb/chipidea/core.c | 2 ++
drivers/usb/chipidea/host.c | 1 +
include/linux/usb/chipidea.h | 1 +
5 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/chipidea/ci.h b/drivers/usb/chipidea/ci.h
index f210b7489fd5b..78cfbe621272c 100644
--- a/drivers/usb/chipidea/ci.h
+++ b/drivers/usb/chipidea/ci.h
@@ -257,6 +257,7 @@ struct ci_hdrc {
bool id_event;
bool b_sess_valid_event;
bool imx28_write_fix;
+ bool has_portsc_pec_bug;
bool supports_runtime_pm;
bool in_lpm;
bool wakeup_int;
diff --git a/drivers/usb/chipidea/ci_hdrc_imx.c b/drivers/usb/chipidea/ci_hdrc_imx.c
index f7577f2bd2c5d..4a5a4904aab6d 100644
--- a/drivers/usb/chipidea/ci_hdrc_imx.c
+++ b/drivers/usb/chipidea/ci_hdrc_imx.c
@@ -67,11 +67,13 @@ static const struct ci_hdrc_imx_platform_flag imx7d_usb_data = {

static const struct ci_hdrc_imx_platform_flag imx7ulp_usb_data = {
.flags = CI_HDRC_SUPPORTS_RUNTIME_PM |
+ CI_HDRC_HAS_PORTSC_PEC_MISSED |
CI_HDRC_PMQOS,
};

static const struct ci_hdrc_imx_platform_flag imx8ulp_usb_data = {
- .flags = CI_HDRC_SUPPORTS_RUNTIME_PM,
+ .flags = CI_HDRC_SUPPORTS_RUNTIME_PM |
+ CI_HDRC_HAS_PORTSC_PEC_MISSED,
};

static const struct of_device_id ci_hdrc_imx_dt_ids[] = {
diff --git a/drivers/usb/chipidea/core.c b/drivers/usb/chipidea/core.c
index 798cb077867ab..449ec7d3f0027 100644
--- a/drivers/usb/chipidea/core.c
+++ b/drivers/usb/chipidea/core.c
@@ -1045,6 +1045,8 @@ static int ci_hdrc_probe(struct platform_device *pdev)
CI_HDRC_IMX28_WRITE_FIX);
ci->supports_runtime_pm = !!(ci->platdata->flags &
CI_HDRC_SUPPORTS_RUNTIME_PM);
+ ci->has_portsc_pec_bug = !!(ci->platdata->flags &
+ CI_HDRC_HAS_PORTSC_PEC_MISSED);
platform_set_drvdata(pdev, ci);

ret = hw_device_init(ci, base);
diff --git a/drivers/usb/chipidea/host.c b/drivers/usb/chipidea/host.c
index ebe7400243b12..08af26b762a2d 100644
--- a/drivers/usb/chipidea/host.c
+++ b/drivers/usb/chipidea/host.c
@@ -151,6 +151,7 @@ static int host_start(struct ci_hdrc *ci)
ehci->has_hostpc = ci->hw_bank.lpm;
ehci->has_tdi_phy_lpm = ci->hw_bank.lpm;
ehci->imx28_write_fix = ci->imx28_write_fix;
+ ehci->has_ci_pec_bug = ci->has_portsc_pec_bug;

priv = (struct ehci_ci_priv *)ehci->priv;
priv->reg_vbus = NULL;
diff --git a/include/linux/usb/chipidea.h b/include/linux/usb/chipidea.h
index ee38835ed77cc..0b4f2d5faa080 100644
--- a/include/linux/usb/chipidea.h
+++ b/include/linux/usb/chipidea.h
@@ -63,6 +63,7 @@ struct ci_hdrc_platform_data {
#define CI_HDRC_IMX_IS_HSIC BIT(14)
#define CI_HDRC_PMQOS BIT(15)
#define CI_HDRC_PHY_VBUS_CONTROL BIT(16)
+#define CI_HDRC_HAS_PORTSC_PEC_MISSED BIT(17)
enum usb_dr_mode dr_mode;
#define CI_HDRC_CONTROLLER_RESET_EVENT 0
#define CI_HDRC_CONTROLLER_STOPPED_EVENT 1
--
2.40.1