[src/trunk]: src/sys/arch/arm/allwinner For DDC, we don't have a real I2C bus...

[jmcneill <jmcneill%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/9df7ef22ff12
branches:  trunk
changeset: 339500:9df7ef22ff12
user:      jmcneill <jmcneill%NetBSD.org@localhost>
date:      Sat Jul 25 15:19:54 2015 +0000

description:
For DDC, we don't have a real I2C bus, but instead read an EDID block at
a time. Read the blocks ourselves instead of pulling in ddc_read_edid.

diffstat:

 sys/arch/arm/allwinner/awin_hdmi.c |  33 +++++++++++++++++++++++++++++----
 sys/arch/arm/allwinner/files.awin  |   4 ++--
 2 files changed, 31 insertions(+), 6 deletions(-)

diffs (93 lines):

diff -r c14eb14767f3 -r 9df7ef22ff12 sys/arch/arm/allwinner/awin_hdmi.c
--- a/sys/arch/arm/allwinner/awin_hdmi.c        Sat Jul 25 13:01:06 2015 +0000
+++ b/sys/arch/arm/allwinner/awin_hdmi.c        Sat Jul 25 15:19:54 2015 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: awin_hdmi.c,v 1.15 2014/11/17 10:00:14 jmcneill Exp $ */
+/* $NetBSD: awin_hdmi.c,v 1.16 2015/07/25 15:19:54 jmcneill Exp $ */
 
 /*-
  * Copyright (c) 2014 Jared D. McNeill <jmcneill%invisible.ca@localhost>
@@ -32,7 +32,7 @@
 #define AWIN_HDMI_PLL  3       /* PLL7 or PLL3 */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: awin_hdmi.c,v 1.15 2014/11/17 10:00:14 jmcneill Exp $");
+__KERNEL_RCSID(0, "$NetBSD: awin_hdmi.c,v 1.16 2015/07/25 15:19:54 jmcneill Exp $");
 
 #include <sys/param.h>
 #include <sys/bus.h>
@@ -99,6 +99,8 @@
 
 static void    awin_hdmi_enable(struct awin_hdmi_softc *);
 static void    awin_hdmi_read_edid(struct awin_hdmi_softc *);
+static int     awin_hdmi_read_edid_block(struct awin_hdmi_softc *, uint8_t *,
+                                         uint8_t);
 static u_int   awin_hdmi_get_display_mode(struct awin_hdmi_softc *,
                                           const struct edid_info *);
 static void    awin_hdmi_video_enable(struct awin_hdmi_softc *, bool);
@@ -486,6 +488,29 @@
        delay(1000);
 }
 
+static int
+awin_hdmi_read_edid_block(struct awin_hdmi_softc *sc, uint8_t *data,
+    uint8_t block)
+{
+       i2c_tag_t tag = &sc->sc_ic;
+       uint8_t wbuf[2];
+       int error;
+
+       if ((error = iic_acquire_bus(tag, I2C_F_POLL)) != 0)
+               return error;
+
+       wbuf[0] = block;        /* start address */
+
+       if ((error = iic_exec(tag, I2C_OP_READ_WITH_STOP, DDC_ADDR, wbuf, 1,
+           data, 128, I2C_F_POLL)) != 0) {
+               iic_release_bus(tag, I2C_F_POLL);
+               return error;
+       }
+       iic_release_bus(tag, I2C_F_POLL);
+
+       return 0;
+}
+
 static void
 awin_hdmi_read_edid(struct awin_hdmi_softc *sc)
 {
@@ -499,7 +524,7 @@
        memset(&ei, 0, sizeof(ei));
 
        while (--retry > 0) {
-               if (!ddc_read_edid_block(&sc->sc_ic, edid, sizeof(edid), 0))
+               if (!awin_hdmi_read_edid_block(sc, edid, 0))
                        break;
        }
        if (retry == 0) {
@@ -566,7 +591,7 @@
         * found in that, assume HDMI mode.
         */
        for (n = 1; n <= MIN(ei->edid_ext_block_count, 4); n++) {
-               if (ddc_read_edid_block(&sc->sc_ic, edid, sizeof(edid), n)) {
+               if (awin_hdmi_read_edid_block(sc, edid, n)) {
 #ifdef AWIN_HDMI_DEBUG
                        device_printf(sc->sc_dev,
                            "Failed to read EDID block %d\n", n);
diff -r c14eb14767f3 -r 9df7ef22ff12 sys/arch/arm/allwinner/files.awin
--- a/sys/arch/arm/allwinner/files.awin Sat Jul 25 13:01:06 2015 +0000
+++ b/sys/arch/arm/allwinner/files.awin Sat Jul 25 15:19:54 2015 +0000
@@ -1,4 +1,4 @@
-#      $NetBSD: files.awin,v 1.31 2015/04/20 01:33:22 matt Exp $
+#      $NetBSD: files.awin,v 1.32 2015/07/25 15:19:54 jmcneill Exp $
 #
 # Configuration info for Allwinner ARM Peripherals
 #
@@ -140,7 +140,7 @@
 file   arch/arm/allwinner/awin_ac.c            awin_ac
 
 # A20/A31 HDMI
-device awinhdmi: edid, ddc_read_edid, videomode
+device awinhdmi: edid, videomode
 attach awinhdmi at awinio with awin_hdmi
 file   arch/arm/allwinner/awin_hdmi.c          awin_hdmi