Date: Wed, 17 Jan 2018 08:01:51 +0000 (UTC) From: Wojciech Macek <wma@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r328077 - head/sys/powerpc/powernv Message-ID: <201801170801.w0H81pJR044093@repo.freebsd.org>
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Author: wma Date: Wed Jan 17 08:01:51 2018 New Revision: 328077 URL: https://svnweb.freebsd.org/changeset/base/328077 Log: PowerNV: workaround console on OPAL 5.4 FreeBSD prints text char-by-char, which is not what OPAL is designed to. Poll events more frequently to avoid buffer overflow and loosing data. Created by: Wojciech Macek <wma@semihalf.com> Obtained from: Semihalf Sponsored by: QCM Technologies Modified: head/sys/powerpc/powernv/opal_console.c Modified: head/sys/powerpc/powernv/opal_console.c ============================================================================== --- head/sys/powerpc/powernv/opal_console.c Wed Jan 17 07:39:11 2018 (r328076) +++ head/sys/powerpc/powernv/opal_console.c Wed Jan 17 08:01:51 2018 (r328077) @@ -435,11 +435,15 @@ uart_opal_cngetc(struct consdev *cp) static void uart_opal_cnputc(struct consdev *cp, int c) { - static uint64_t events; unsigned char ch = c; + int a; - if (cold) - opal_call(OPAL_POLL_EVENTS, &events); /* Clear FIFO if needed */ + if (1) { + /* Clear FIFO if needed. Must be repeated few times. */ + for (a = 0; a < 20; a++) { + opal_call(OPAL_POLL_EVENTS, NULL); + } + } uart_opal_put(console_sc, &ch, 1); } @@ -461,7 +465,7 @@ uart_opal_ttyoutwakeup(struct tty *tp) int len; sc = tty_softc(tp); - + while ((len = ttydisc_getc(tp, buffer, sizeof(buffer))) != 0) uart_opal_put(sc, buffer, len); } @@ -479,6 +483,8 @@ uart_opal_intr(void *v) ttydisc_rint(tp, c, 0); ttydisc_rint_done(tp); tty_unlock(tp); + + opal_call(OPAL_POLL_EVENTS, NULL); if (sc->irqres == NULL) callout_reset(&sc->callout, sc->polltime, uart_opal_intr, sc);
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