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staging/rdma/hfi1: Clear the QSFP reset that is asserted on FLR

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The FLR on driver load asserts the QSFP reset pin and the driver does
not deassert it after. This patch allows the external QSFP cable to exit
reset by writing 1 to all the QSFP pins.

Reviewed-by: Dean Luick <dean.luick@intel.com>
Signed-off-by: Easwar Hariharan <easwar.hariharan@intel.com>
Signed-off-by: Jubin John <jubin.john@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Easwar Hariharan 2015-11-06 20:06:57 -05:00 committed by Greg Kroah-Hartman
parent 6c63e4238a
commit 72a67ba2fa
1 changed files with 5 additions and 8 deletions
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13
drivers/staging/rdma/hfi1/chip.c
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@ -9923,19 +9923,16 @@ static void init_chip(struct hfi1_devdata *dd)
setextled(dd, 0);
/*
* Clear the QSFP reset.
* A0 leaves the out lines floating on power on, then on an FLR
* enforces a 0 on all out pins. The driver does not touch
* An FLR enforces a 0 on all out pins. The driver does not touch
* ASIC_QSFPn_OUT otherwise. This leaves RESET_N low and
* anything plugged constantly in reset, if it pays attention
* anything plugged constantly in reset, if it pays attention
* to RESET_N.
* A prime example of this is SiPh. For now, set all pins high.
* Prime examples of this are optical cables. Set all pins high.
* I2CCLK and I2CDAT will change per direction, and INT_N and
* MODPRS_N are input only and their value is ignored.
*/
if (is_a0(dd)) {
write_csr(dd, ASIC_QSFP1_OUT, 0x1f);
write_csr(dd, ASIC_QSFP2_OUT, 0x1f);
}
write_csr(dd, ASIC_QSFP1_OUT, 0x1f);
write_csr(dd, ASIC_QSFP2_OUT, 0x1f);
}
static void init_early_variables(struct hfi1_devdata *dd)