| Message ID | 20230531095624.1802757-1-nava.kishore.manne@amd.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [v2] fpga: zynq-fpga: Ensure proper xCAP interface switch | expand |
On 2023-05-31 at 15:26:24 +0530, Nava kishore Manne wrote: > From: Alfonso Rodriguez <alfonso.rodriguezm@upm.es> > > The Zynq platform has PCAP, ICAP and JTAG interfaces for configuring > programmable logic (PL). The existing driver implementation uses the > PCAP interface to configure the PL. Before switching the PL configuration > interface from PCAP to ICAP make sure that all outstanding Transactions > relevant to the PL configuration should be completed by the PCAP interface > otherwise it may lead to PL configuration issues. > > This patch provides a required fix to ensure that all existing PL > transactions are completed before switching from PCAP to ICAP. > > For detailed information relevant to PL configuration interfaces refer > Zynq 7000 TRM (section 6.5.1). > Link: https://docs.xilinx.com/v/u/en-US/ug585-Zynq-7000-TRM > > Signed-off-by: Alfonso Rodriguez <alfonso.rodriguezm@upm.es> > Signed-off-by: Nava kishore Manne <nava.kishore.manne@amd.com> > --- > Changes for v2: > - Updated commit message and added Doc link as suggested by Yilun. > > drivers/fpga/zynq-fpga.c | 9 +++++---- > 1 file changed, 5 insertions(+), 4 deletions(-) > > diff --git a/drivers/fpga/zynq-fpga.c b/drivers/fpga/zynq-fpga.c > index ae0da361e6c6..88db9ac36887 100644 > --- a/drivers/fpga/zynq-fpga.c > +++ b/drivers/fpga/zynq-fpga.c > @@ -493,15 +493,16 @@ static int zynq_fpga_ops_write_complete(struct fpga_manager *mgr, > if (err) > return err; > > - /* Release 'PR' control back to the ICAP */ > - zynq_fpga_write(priv, CTRL_OFFSET, > - zynq_fpga_read(priv, CTRL_OFFSET) & ~CTRL_PCAP_PR_MASK); > - > err = zynq_fpga_poll_timeout(priv, INT_STS_OFFSET, intr_status, > intr_status & IXR_PCFG_DONE_MASK, > INIT_POLL_DELAY, > INIT_POLL_TIMEOUT); > > + /* Release 'PR' control back to the ICAP */ > + zynq_fpga_write(priv, CTRL_OFFSET, > + zynq_fpga_read(priv, CTRL_OFFSET) > + & ~CTRL_PCAP_PR_MASK); Don't put the & at the beginning of the line: zynq_fpga_read(priv, CTRL_OFFSET) & ~CTRL_PCAP_PR_MASK); or just: zynq_fpga_read(priv, CTRL_OFFSET) & ~CTRL_PCAP_PR_MASK); 80 lines is not a must now. Others look good to me. Thanks, Yilun > + > clk_disable(priv->clk); > > if (err) > -- > 2.25.1 >
diff --git a/drivers/fpga/zynq-fpga.c b/drivers/fpga/zynq-fpga.c index ae0da361e6c6..88db9ac36887 100644 --- a/drivers/fpga/zynq-fpga.c +++ b/drivers/fpga/zynq-fpga.c @@ -493,15 +493,16 @@ static int zynq_fpga_ops_write_complete(struct fpga_manager *mgr, if (err) return err; - /* Release 'PR' control back to the ICAP */ - zynq_fpga_write(priv, CTRL_OFFSET, - zynq_fpga_read(priv, CTRL_OFFSET) & ~CTRL_PCAP_PR_MASK); - err = zynq_fpga_poll_timeout(priv, INT_STS_OFFSET, intr_status, intr_status & IXR_PCFG_DONE_MASK, INIT_POLL_DELAY, INIT_POLL_TIMEOUT); + /* Release 'PR' control back to the ICAP */ + zynq_fpga_write(priv, CTRL_OFFSET, + zynq_fpga_read(priv, CTRL_OFFSET) + & ~CTRL_PCAP_PR_MASK); + clk_disable(priv->clk); if (err)