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Commit 72a67ba2 authored by Easwar Hariharan's avatar Easwar Hariharan Committed by Greg Kroah-Hartman
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staging/rdma/hfi1: Clear the QSFP reset that is asserted on FLR 



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: default avatarDean Luick <dean.luick@intel.com>
Signed-off-by: default avatarEaswar Hariharan <easwar.hariharan@intel.com>
Signed-off-by: default avatarJubin John <jubin.john@intel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 6c63e423

drivers/staging/rdma/hfi1/chip.c

+5 −8
Original line number Diff line number Diff line
@@ -9923,20 +9923,17 @@ 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

	 * 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);

}

}



static void init_early_variables(struct hfi1_devdata *dd)

{