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[src/trunk]: src/sys/dev/i2c Add basic support for Analogix eDP transmitters....
details: https://anonhg.NetBSD.org/src/rev/ecb35c88dfb1
branches: trunk
changeset: 448463:ecb35c88dfb1
user: jmcneill <jmcneill%NetBSD.org@localhost>
date: Sun Feb 03 13:17:12 2019 +0000
description:
Add basic support for Analogix eDP transmitters. This driver doesn't
know how to mode set yet -- it only knows how to read EDID from a panel.
diffstat:
sys/dev/i2c/anxedp.c | 432 ++++++++++++++++++++++++++++++++++++++++++++++++++
sys/dev/i2c/files.i2c | 7 +-
2 files changed, 438 insertions(+), 1 deletions(-)
diffs (truncated from 454 to 300 lines):
diff -r 18460f38de58 -r ecb35c88dfb1 sys/dev/i2c/anxedp.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/dev/i2c/anxedp.c Sun Feb 03 13:17:12 2019 +0000
@@ -0,0 +1,432 @@
+/* $NetBSD: anxedp.c,v 1.1 2019/02/03 13:17:12 jmcneill Exp $ */
+
+/*-
+ * Copyright (c) 2019 Jared D. McNeill <jmcneill%invisible.ca@localhost>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__KERNEL_RCSID(0, "$NetBSD: anxedp.c,v 1.1 2019/02/03 13:17:12 jmcneill Exp $");
+
+#include <sys/param.h>
+#include <sys/bus.h>
+#include <sys/device.h>
+#include <sys/intr.h>
+#include <sys/systm.h>
+#include <sys/kernel.h>
+#include <sys/conf.h>
+
+#include <dev/ic/dw_hdmi.h>
+
+#include <dev/i2c/i2cvar.h>
+#include <dev/i2c/ddcvar.h>
+#include <dev/i2c/ddcreg.h>
+#include <dev/videomode/videomode.h>
+#include <dev/videomode/edidvar.h>
+
+#include <dev/fdt/fdtvar.h>
+#include <dev/fdt/fdt_port.h>
+
+#include <drm/drmP.h>
+#include <drm/drm_crtc.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_edid.h>
+
+#define ANX_DP_AUX_CH_CTL_1 0xe5
+#define ANX_AUX_LENGTH __BITS(7,4)
+#define ANX_AUX_TX_COMM __BITS(3,0)
+#define ANX_AUX_TX_COMM_MOT 4
+#define ANX_AUX_TX_COMM_READ 1
+#define ANX_DP_AUX_ADDR(n) (0xe6 + (n))
+#define ANX_DP_AUX_CH_CTL_2 0xe9
+#define ANX_ADDR_ONLY __BIT(1)
+#define ANX_AUX_EN __BIT(0)
+#define ANX_BUF_DATA(n) (0xf0 + (n))
+
+#define ANX_DP_INT_STA 0xf7
+#define ANX_RPLY_RECEIV __BIT(1)
+
+static const struct device_compatible_entry compat_data[] = {
+ { "analogix,anx6345", 1 },
+ { NULL }
+};
+
+struct anxedp_softc;
+
+struct anxedp_connector {
+ struct drm_connector base;
+ struct anxedp_softc *sc;
+};
+
+struct anxedp_softc {
+ device_t sc_dev;
+ i2c_tag_t sc_i2c;
+ i2c_addr_t sc_addr;
+ int sc_phandle;
+
+ struct anxedp_connector sc_connector;
+ struct drm_bridge sc_bridge;
+
+ struct fdt_device_ports sc_ports;
+ struct drm_display_mode sc_curmode;
+};
+
+#define to_anxedp_connector(x) container_of(x, struct anxedp_connector, base)
+
+static uint8_t
+anxedp_read(struct anxedp_softc *sc, u_int off, uint8_t reg)
+{
+ uint8_t val;
+
+ if (iic_smbus_read_byte(sc->sc_i2c, sc->sc_addr + off, reg, &val, I2C_F_POLL) != 0)
+ val = 0xff;
+
+ return val;
+}
+
+static void
+anxedp_write(struct anxedp_softc *sc, u_int off, uint8_t reg, uint8_t val)
+{
+ (void)iic_smbus_write_byte(sc->sc_i2c, sc->sc_addr + off, reg, val, I2C_F_POLL);
+}
+
+static enum drm_connector_status
+anxedp_connector_detect(struct drm_connector *connector, bool force)
+{
+ return connector_status_connected;
+}
+
+static void
+anxedp_connector_destroy(struct drm_connector *connector)
+{
+ drm_connector_unregister(connector);
+ drm_connector_cleanup(connector);
+}
+
+static const struct drm_connector_funcs anxedp_connector_funcs = {
+ .dpms = drm_helper_connector_dpms,
+ .detect = anxedp_connector_detect,
+ .fill_modes = drm_helper_probe_single_connector_modes,
+ .destroy = anxedp_connector_destroy,
+};
+
+static int
+anxedp_aux_wait(struct anxedp_softc *sc)
+{
+ uint8_t val;
+ int retry;
+
+ for (retry = 1000; retry > 0; retry--) {
+ val = anxedp_read(sc, 0, ANX_DP_AUX_CH_CTL_2);
+ if ((val & ANX_AUX_EN) == 0)
+ break;
+ delay(100);
+ }
+ if (retry == 0) {
+ device_printf(sc->sc_dev, "aux transfer timeout\n");
+ return ETIMEDOUT;
+ }
+
+ for (retry = 1000; retry > 0; retry--) {
+ val = anxedp_read(sc, 1, ANX_DP_INT_STA);
+ if ((val & ANX_RPLY_RECEIV) != 0) {
+ anxedp_write(sc, 1, ANX_DP_INT_STA, val);
+ break;
+ }
+ delay(100);
+ }
+ if (retry == 0) {
+ device_printf(sc->sc_dev, "aux transfer timeout\n");
+ return ETIMEDOUT;
+ }
+
+ return 0;
+}
+
+static int
+anxedp_aux_transfer(struct anxedp_softc *sc, uint8_t comm, uint32_t addr,
+ uint8_t *buf, int buflen)
+{
+ uint8_t ctrl[2];
+ int n, error;
+
+ ctrl[0] = __SHIFTIN(comm, ANX_AUX_TX_COMM);
+ if (buflen > 0)
+ ctrl[0] |= __SHIFTIN(buflen - 1, ANX_AUX_LENGTH);
+ ctrl[1] = ANX_AUX_EN;
+ if (buflen == 0)
+ ctrl[1] |= ANX_ADDR_ONLY;
+
+ if (comm != ANX_AUX_TX_COMM_READ) {
+ for (n = 0; n < buflen; n++)
+ anxedp_write(sc, 0, ANX_BUF_DATA(n), buf[n]);
+ }
+
+ anxedp_write(sc, 0, ANX_DP_AUX_ADDR(0), addr & 0xff);
+ anxedp_write(sc, 0, ANX_DP_AUX_ADDR(1), (addr >> 8) & 0xff);
+ anxedp_write(sc, 0, ANX_DP_AUX_ADDR(2), (addr >> 16) & 0xf);
+ anxedp_write(sc, 0, ANX_DP_AUX_CH_CTL_1, ctrl[0]);
+ anxedp_write(sc, 0, ANX_DP_AUX_CH_CTL_2, ctrl[1]);
+
+ error = anxedp_aux_wait(sc);
+ if (error != 0)
+ return error;
+
+ if (comm == ANX_AUX_TX_COMM_READ) {
+ for (n = 0; n < buflen; n++)
+ buf[n] = anxedp_read(sc, 0, ANX_BUF_DATA(n));
+ }
+
+ return 0;
+}
+
+static int
+anxedp_read_edid(struct anxedp_softc *sc, uint8_t *edid, int edidlen)
+{
+ int error;
+ uint8_t n;
+
+ for (n = 0; n < edidlen; n += 16) {
+ const int xferlen = MIN(edidlen - n, 16);
+
+ error = anxedp_aux_transfer(sc, ANX_AUX_TX_COMM_MOT, DDC_ADDR, &n, 1);
+ if (error != 0)
+ return error;
+
+ error = anxedp_aux_transfer(sc, ANX_AUX_TX_COMM_READ, DDC_ADDR, &edid[n], xferlen);
+ if (error != 0)
+ return error;
+ }
+
+ return 0;
+}
+
+static int
+anxedp_connector_get_modes(struct drm_connector *connector)
+{
+ struct anxedp_connector *anxedp_connector = to_anxedp_connector(connector);
+ struct anxedp_softc * const sc = anxedp_connector->sc;
+ char edid[EDID_LENGTH];
+ struct edid *pedid = NULL;
+ int error;
+
+ iic_acquire_bus(sc->sc_i2c, I2C_F_POLL);
+ error = anxedp_read_edid(sc, edid, sizeof(edid));
+ iic_release_bus(sc->sc_i2c, I2C_F_POLL);
+ if (error == 0)
+ pedid = (struct edid *)edid;
+
+ drm_mode_connector_update_edid_property(connector, pedid);
+ if (pedid == NULL)
+ return 0;
+
+ error = drm_add_edid_modes(connector, pedid);
+ drm_edid_to_eld(connector, pedid);
+
+ return error;
+}
+
+static struct drm_encoder *
+anxedp_connector_best_encoder(struct drm_connector *connector)
+{
+ int enc_id = connector->encoder_ids[0];
+ struct drm_mode_object *obj;
+ struct drm_encoder *encoder = NULL;
+
+ if (enc_id) {
+ obj = drm_mode_object_find(connector->dev, enc_id,
+ DRM_MODE_OBJECT_ENCODER);
+ if (obj == NULL)
+ return NULL;
+ encoder = obj_to_encoder(obj);
+ }
+
+ return encoder;
+}
+
+static const struct drm_connector_helper_funcs anxedp_connector_helper_funcs = {
+ .get_modes = anxedp_connector_get_modes,
+ .best_encoder = anxedp_connector_best_encoder,
+};
+
+static int
+anxedp_bridge_attach(struct drm_bridge *bridge)
+{
+ struct anxedp_softc * const sc = bridge->driver_private;
+ struct anxedp_connector *anxedp_connector = &sc->sc_connector;
+ struct drm_connector *connector = &anxedp_connector->base;
+ int error;
+
+ anxedp_connector->sc = sc;
+
+ connector->polled = DRM_CONNECTOR_POLL_CONNECT | DRM_CONNECTOR_POLL_DISCONNECT;
+ connector->interlace_allowed = 0;
+ connector->doublescan_allowed = 0;
+
+ drm_connector_init(bridge->dev, connector, &anxedp_connector_funcs,
+ connector->connector_type);
+ drm_connector_helper_add(connector, &anxedp_connector_helper_funcs);
+
+ error = drm_mode_connector_attach_encoder(connector, bridge->encoder);
+ if (error != 0)
+ return error;
+
+ return drm_connector_register(connector);
+}
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