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| author | Yangbo Lu <yangbo.lu@nxp.com> | 2019-12-12 18:08:04 +0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2019-12-16 15:56:41 -0800 |
| commit | 10bc877c762339b8501a5b397137cf2f47cde575 (patch) | |
| tree | da78b7655e4d02ba7aabb8a347d0c37ba474a73e /drivers | |
| parent | 0e627190563e8be6fc9c2cc2a8a3c14bd961754c (diff) | |
| download | linux-10bc877c762339b8501a5b397137cf2f47cde575.tar.gz linux-10bc877c762339b8501a5b397137cf2f47cde575.tar.bz2 linux-10bc877c762339b8501a5b397137cf2f47cde575.zip | |
ptp_qoriq: check valid status before reading extts fifo
For PTP timer supporting external trigger timestamp FIFO,
there is a valid bit in TMR_STAT register indicating the
timestamp is available. For PTP timer without FIFO, there
is not TMR_STAT register.
This patch is to check the valid bit for the FIFO before
reading timestamp, and to avoid operating TMR_STAT register
for PTP timer without the FIFO.
Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/ptp/ptp_qoriq.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/drivers/ptp/ptp_qoriq.c b/drivers/ptp/ptp_qoriq.c index a577218d1ab7..a3062cd4d174 100644 --- a/drivers/ptp/ptp_qoriq.c +++ b/drivers/ptp/ptp_qoriq.c @@ -81,7 +81,7 @@ static int extts_clean_up(struct ptp_qoriq *ptp_qoriq, int index, struct ptp_clock_event event; void __iomem *reg_etts_l; void __iomem *reg_etts_h; - u32 valid, stat, lo, hi; + u32 valid, lo, hi; switch (index) { case 0: @@ -101,6 +101,10 @@ static int extts_clean_up(struct ptp_qoriq *ptp_qoriq, int index, event.type = PTP_CLOCK_EXTTS; event.index = index; + if (ptp_qoriq->extts_fifo_support) + if (!(ptp_qoriq->read(®s->ctrl_regs->tmr_stat) & valid)) + return 0; + do { lo = ptp_qoriq->read(reg_etts_l); hi = ptp_qoriq->read(reg_etts_h); @@ -111,8 +115,9 @@ static int extts_clean_up(struct ptp_qoriq *ptp_qoriq, int index, ptp_clock_event(ptp_qoriq->clock, &event); } - stat = ptp_qoriq->read(®s->ctrl_regs->tmr_stat); - } while (ptp_qoriq->extts_fifo_support && (stat & valid)); + if (!ptp_qoriq->extts_fifo_support) + break; + } while (ptp_qoriq->read(®s->ctrl_regs->tmr_stat) & valid); return 0; } |