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author | John Keeping <john@metanate.com> | 2019-12-19 11:34:31 +0000 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-02-24 08:34:37 +0100 |
commit | 39a80bbf577864ff28bb42b0dbc5086b4206c587 (patch) | |
tree | cd02168e97f95d5c1fd2352517c25174fec06643 /drivers/clocksource/bcm2835_timer.c | |
parent | 6c0538252a19b9f4699a30a45cb265c316507e02 (diff) | |
download | linux-stable-39a80bbf577864ff28bb42b0dbc5086b4206c587.tar.gz linux-stable-39a80bbf577864ff28bb42b0dbc5086b4206c587.tar.bz2 linux-stable-39a80bbf577864ff28bb42b0dbc5086b4206c587.zip |
usb: dwc2: Fix IN FIFO allocation
[ Upstream commit 644139f8b64d818f6345351455f14471510879a5 ]
On chips with fewer FIFOs than endpoints (for example RK3288 which has 9
endpoints, but only 6 which are cabable of input), the DPTXFSIZN
registers above the FIFO count may return invalid values.
With logging added on startup, I see:
dwc2 ff580000.usb: dwc2_hsotg_init_fifo: ep=1 sz=256
dwc2 ff580000.usb: dwc2_hsotg_init_fifo: ep=2 sz=128
dwc2 ff580000.usb: dwc2_hsotg_init_fifo: ep=3 sz=128
dwc2 ff580000.usb: dwc2_hsotg_init_fifo: ep=4 sz=64
dwc2 ff580000.usb: dwc2_hsotg_init_fifo: ep=5 sz=64
dwc2 ff580000.usb: dwc2_hsotg_init_fifo: ep=6 sz=32
dwc2 ff580000.usb: dwc2_hsotg_init_fifo: ep=7 sz=0
dwc2 ff580000.usb: dwc2_hsotg_init_fifo: ep=8 sz=0
dwc2 ff580000.usb: dwc2_hsotg_init_fifo: ep=9 sz=0
dwc2 ff580000.usb: dwc2_hsotg_init_fifo: ep=10 sz=0
dwc2 ff580000.usb: dwc2_hsotg_init_fifo: ep=11 sz=0
dwc2 ff580000.usb: dwc2_hsotg_init_fifo: ep=12 sz=0
dwc2 ff580000.usb: dwc2_hsotg_init_fifo: ep=13 sz=0
dwc2 ff580000.usb: dwc2_hsotg_init_fifo: ep=14 sz=0
dwc2 ff580000.usb: dwc2_hsotg_init_fifo: ep=15 sz=0
but:
# cat /sys/kernel/debug/ff580000.usb/fifo
Non-periodic FIFOs:
RXFIFO: Size 275
NPTXFIFO: Size 16, Start 0x00000113
Periodic TXFIFOs:
DPTXFIFO 1: Size 256, Start 0x00000123
DPTXFIFO 2: Size 128, Start 0x00000223
DPTXFIFO 3: Size 128, Start 0x000002a3
DPTXFIFO 4: Size 64, Start 0x00000323
DPTXFIFO 5: Size 64, Start 0x00000363
DPTXFIFO 6: Size 32, Start 0x000003a3
DPTXFIFO 7: Size 0, Start 0x000003e3
DPTXFIFO 8: Size 0, Start 0x000003a3
DPTXFIFO 9: Size 256, Start 0x00000123
so it seems that FIFO 9 is mirroring FIFO 1.
Fix the allocation by using the FIFO count instead of the endpoint count
when selecting a FIFO for an endpoint.
Acked-by: Minas Harutyunyan <hminas@synopsys.com>
Signed-off-by: John Keeping <john@metanate.com>
Signed-off-by: Felipe Balbi <balbi@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/clocksource/bcm2835_timer.c')
0 files changed, 0 insertions, 0 deletions