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usb: chipidea: add CI_HDRC_HAS_SHORT_PKT_LIMIT flag

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Currently, the imx deivice controller has below limitations:

1. can't generate short packet interrupt if IOC not set in dTD. So if one
   request span more than one dTDs and only the last dTD set IOC, the usb
   request will pending there if no more data comes.
2. the controller can't accurately deliver data to differtent usb requests
   in some cases due to short packet. For example: one usb request span 3
   dTDs, then if the controller received a short packet the next packet
   will go to 2nd dTD of current request rather than the first dTD of next
   request.
3. can't build a bus packet use multiple dTDs. For example: controller
   needs to send one packet of 512 bytes use dTD1 (200 bytes) + dTD2
   (312 bytes), actually the host side will see 200 bytes short packet.

Based on these limits, add CI_HDRC_HAS_SHORT_PKT_LIMIT flag and use it on
imx platforms.

Signed-off-by: Xu Yang <xu.yang_2@nxp.com>
Acked-by: Peter Chen <peter.chen@kernel.org>
Link: https://lore.kernel.org/r/20240923081203.2851768-1-xu.yang_2@nxp.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Xu Yang 2024-09-23 16:12:01 +08:00 committed by Greg Kroah-Hartman
parent 669e995f70
commit ec841b8d73
4 changed files with 5 additions and 0 deletions
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1
drivers/usb/chipidea/ci.h
View File

@ -260,6 +260,7 @@ struct ci_hdrc {
bool b_sess_valid_event;
bool imx28_write_fix;
bool has_portsc_pec_bug;
bool has_short_pkt_limit;
bool supports_runtime_pm;
bool in_lpm;
bool wakeup_int;

1
drivers/usb/chipidea/ci_hdrc_imx.c
View File

@ -342,6 +342,7 @@ static int ci_hdrc_imx_probe(struct platform_device *pdev)
struct ci_hdrc_platform_data pdata = {
.name = dev_name(&pdev->dev),
.capoffset = DEF_CAPOFFSET,
.flags = CI_HDRC_HAS_SHORT_PKT_LIMIT,
.notify_event = ci_hdrc_imx_notify_event,
};
int ret;

2
drivers/usb/chipidea/core.c
View File

@ -1076,6 +1076,8 @@ static int ci_hdrc_probe(struct platform_device *pdev)
CI_HDRC_SUPPORTS_RUNTIME_PM);
ci->has_portsc_pec_bug = !!(ci->platdata->flags &
CI_HDRC_HAS_PORTSC_PEC_MISSED);
ci->has_short_pkt_limit = !!(ci->platdata->flags &
CI_HDRC_HAS_SHORT_PKT_LIMIT);
platform_set_drvdata(pdev, ci);
ret = hw_device_init(ci, base);

1
include/linux/usb/chipidea.h
View File

@ -65,6 +65,7 @@ struct ci_hdrc_platform_data {
#define CI_HDRC_PHY_VBUS_CONTROL BIT(16)
#define CI_HDRC_HAS_PORTSC_PEC_MISSED BIT(17)
#define CI_HDRC_FORCE_VBUS_ACTIVE_ALWAYS BIT(18)
#define CI_HDRC_HAS_SHORT_PKT_LIMIT BIT(19)
enum usb_dr_mode dr_mode;
#define CI_HDRC_CONTROLLER_RESET_EVENT 0
#define CI_HDRC_CONTROLLER_STOPPED_EVENT 1