[Intel-gfx] [PATCH 1/4] drm: Add helper for DP++ adaptors
Ville Syrjälä
ville.syrjala at linux.intel.com
Thu Mar 31 20:33:47 UTC 2016
On Thu, Mar 31, 2016 at 07:25:36PM +0000, Zanoni, Paulo R wrote:
> Em Ter, 2016-02-23 às 18:46 +0200, ville.syrjala at linux.intel.com
> escreveu:
> > From: Ville Syrjälä <ville.syrjala at linux.intel.com>
> >
> > Add a helper which aids in he identification of DP dual mode (aka.
> > DP++)
> > adaptors. There are several types of adaptors specified:
> > type 1 DVI, type 1 HDMI, type 2 DVI, type 2 HDMI
> >
> > Type 1 adaptors have a max TMDS clock limit of 165MHz, type 2
> > adaptors
> > may go as high as 300MHz and they provide a register informing the
> > source device what the actual limit is. Supposedly also type 1
> > adaptors
> > may optionally implement this register. This TMDS clock limit is the
> > main reason why we need to identify these adaptors.
> >
> > Type 1 adaptors provide access to their internal registers and the
> > sink
> > DDC bus through I2C. Type 2 adaptors provide this access both via I2C
> > and I2C-over-AUX. A type 2 source device may choose to implement
> > either
> > or both of these methods. If a source device implements only the
> > I2C-over-AUX method, then the driver will obviously need specific
> > support for such adaptors since the port is driven like an HDMI port,
> > but DDC communication happes over the AUX channel.
> >
> > This helper should be enough to identify the adaptor type (some
> > type 1 DVI adaptors may be a slight exception) and the maximum TMDS
> > clock limit. Another feature that may be available is control over
> > the TMDS output buffers on the adaptor, possibly allowing for some
> > power saving when the TMDS link is down.
> >
> > Other user controllable features that may be available in the
> > adaptors
> > are downstream i2c bus speed control when using i2c-over-aux, and
> > some control over the CEC pin. I chose not to provide any helper
> > functions for those since I have no use for them in i915 at this
> > time.
> > The rest of the registers in the adaptor are mostly just information,
> > eg. IEEE OUI, hardware and firmware revision, etc.
>
> Please run a spell checker and do some proof-reading both in the commit
> message and in the code comments. Multiple instances of "sizo",
> "Hoever", "adator", "Identyfy", etc. I also spotted some typos in the
> next commits.
>
>
>
> > Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
> > ---
> > drivers/gpu/drm/Makefile | 2 +-
> > drivers/gpu/drm/drm_dp_dual_mode_helper.c | 328
> > ++++++++++++++++++++++++++++++
> > include/drm/drm_dp_dual_mode_helper.h | 80 ++++++++
> > 3 files changed, 409 insertions(+), 1 deletion(-)
> > create mode 100644 drivers/gpu/drm/drm_dp_dual_mode_helper.c
> > create mode 100644 include/drm/drm_dp_dual_mode_helper.h
> >
> > diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
> > index 6eb94fc561dc..22228ef50f36 100644
> > --- a/drivers/gpu/drm/Makefile
> > +++ b/drivers/gpu/drm/Makefile
> > @@ -23,7 +23,7 @@ drm-$(CONFIG_AGP) += drm_agpsupport.o
> >
> > drm_kms_helper-y := drm_crtc_helper.o drm_dp_helper.o
> > drm_probe_helper.o \
> > drm_plane_helper.o drm_dp_mst_topology.o
> > drm_atomic_helper.o \
> > - drm_kms_helper_common.o
> > + drm_kms_helper_common.o drm_dp_dual_mode_helper.o
> >
> > drm_kms_helper-$(CONFIG_DRM_LOAD_EDID_FIRMWARE) += drm_edid_load.o
> > drm_kms_helper-$(CONFIG_DRM_FBDEV_EMULATION) += drm_fb_helper.o
> > diff --git a/drivers/gpu/drm/drm_dp_dual_mode_helper.c
> > b/drivers/gpu/drm/drm_dp_dual_mode_helper.c
> > new file mode 100644
> > index 000000000000..bfe511c09568
> > --- /dev/null
> > +++ b/drivers/gpu/drm/drm_dp_dual_mode_helper.c
> > @@ -0,0 +1,328 @@
> > +/*
> > + * Copyright © 2016 Intel Corporation
> > + *
> > + * Permission is hereby granted, free of charge, to any person
> > obtaining a
> > + * copy of this software and associated documentation files (the
> > "Software"),
> > + * to deal in the Software without restriction, including without
> > limitation
> > + * the rights to use, copy, modify, merge, publish, distribute,
> > sublicense,
> > + * and/or sell copies of the Software, and to permit persons to whom
> > the
> > + * Software is furnished to do so, subject to the following
> > conditions:
> > + *
> > + * The above copyright notice and this permission notice shall be
> > included in
> > + * all copies or substantial portions of the Software.
> > + *
> > + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
> > EXPRESS OR
> > + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
> > MERCHANTABILITY,
> > + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO
> > EVENT SHALL
> > + * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM,
> > DAMAGES OR
> > + * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
> > OTHERWISE,
> > + * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
> > USE OR
> > + * OTHER DEALINGS IN THE SOFTWARE.
> > + */
> > +
> > +#include <linux/errno.h>
> > +#include <linux/export.h>
> > +#include <linux/i2c.h>
> > +#include <linux/slab.h>
> > +#include <linux/string.h>
> > +#include <drm/drm_dp_dual_mode_helper.h>
> > +#include <drm/drmP.h>
> > +
> > +/**
> > + * DOC: DP dual mode (aka. DP++) adaptor helpers
> > + *
> > + * Helper functions to deal with DP dual mode adaptors.
> > + *
> > + * Type 1:
> > + * Adaptor registers (if any) and the sink DDC bus may be accessed
> > via I2C.
> > + *
> > + * Type 2:
> > + * Adaptor registers and sink DDC bus can be accessed either via I2C
> > or
> > + * I2C-over-AUX. Source devices may choose to implement either one
> > or
> > + * both of these access methods.
> > + */
> > +
> > +#define DP_DUAL_MODE_SLAVE_ADDRESS 0x40
> > +
> > +/**
> > + * drm_dp_dual_mode_read - Read from the DP dual mode adaptor
> > register(s)
> > + * adapter: I2C adapter for the DDC bus
> > + * offset: register offset
> > + * buffer: buffer for return data
> > + * size: sizo of the buffer
> > + *
> > + * Reads @size bytes from the DP dual mode adaptor registers
> > + * starting at @offset.
> > + *
> > + * Returns:
> > + * 0 on success, negative error code on failure
> > + */
> > +ssize_t drm_dp_dual_mode_read(struct i2c_adapter *adapter,
> > + u8 offset, void *buffer, size_t size)
> > +{
> > + struct i2c_msg msgs[] = {
> > + {
> > + .addr = DP_DUAL_MODE_SLAVE_ADDRESS,
> > + .flags = 0,
> > + .len = 1,
> > + .buf = &offset,
> > + },
> > + {
> > + .addr = DP_DUAL_MODE_SLAVE_ADDRESS,
> > + .flags = I2C_M_RD,
> > + .len = size,
> > + .buf = buffer,
> > + },
> > + };
> > + int ret;
> > +
> > + ret = i2c_transfer(adapter, msgs, ARRAY_SIZE(msgs));
> > + if (ret < 0)
> > + return ret;
> > + if (ret != ARRAY_SIZE(msgs))
> > + return -EPROTO;
>
> No retries needed here or below? (asking this due to the comment in
> drm_edid.c about retries)
The EDID retries are mostly cargo culted. I suspect you don't really
need them unless the connector is about to fall off, or the wiring
is made of cotton.
>
> > +
> > + return 0;
> > +}
> > +
> > +/**
> > + * drm_dp_dual_mode_write - Write to the DP dual mode adaptor
> > register(s)
> > + * adapter: I2C adapter for the DDC bus
> > + * offset: register offset
> > + * buffer: buffer for write data
> > + * size: sizo of the buffer
> > + *
> > + * Writes @size bytes to the DP dual mode adaptor registers
> > + * starting at @offset.
> > + *
> > + * Returns:
> > + * 0 on success, negative error code on failure
> > + */
> > +ssize_t drm_dp_dual_mode_write(struct i2c_adapter *adapter,
> > + u8 offset, const void *buffer, size_t
> > size)
> > +{
> > + struct i2c_msg msg = {
> > + .addr = DP_DUAL_MODE_SLAVE_ADDRESS,
> > + .flags = 0,
> > + .len = 1 + size,
> > + .buf = NULL,
> > + };
> > + void *data;
> > + int ret;
> > +
> > + data = kmalloc(msg.len, GFP_TEMPORARY);
> > + if (!data)
> > + return -ENOMEM;
> > +
> > + msg.buf = data;
> > +
> > + memcpy(data, &offset, 1);
> > + memcpy(data + 1, buffer, size);
> > +
> > + ret = i2c_transfer(adapter, &msg, 1);
> > +
> > + kfree(data);
> > +
> > + if (ret < 0)
> > + return ret;
> > + if (ret != 1)
> > + return -EPROTO;
> > +
> > + return 0;
> > +}
> > +EXPORT_SYMBOL(drm_dp_dual_mode_write);
> > +
> > +static bool is_hdmi_adaptor(const char
> > hdmi_id[DP_DUAL_MODE_HDMI_ID_LEN])
> > +{
> > + static const char
> > dp_dual_mode_hdmi_id[DP_DUAL_MODE_HDMI_ID_LEN] =
> > + "DP-HDMI ADAPTOR\x04";
> > +
> > + return memcmp(hdmi_id, dp_dual_mode_hdmi_id,
> > + sizeof(dp_dual_mode_hdmi_id)) == 0;
> > +}
> > +
> > +/**
> > + * drm_dp_dual_mode_detect - Identyfy the DP dual mode adaptor
> > + * adapter: I2C adapter for the DDC bus
> > + *
> > + * Attempt to identify the type of the DP dual mode adaptor used.
> > + *
> > + * Note that when the answer is @DRM_DP_DUAL_MODE_NONE it's not
>
> So how about adding a new or just renaming it to
> DRM_DP_DUAL_MODE_UNKNOWN? Let's not assume everybody is going to read
> the docs.
I suppose adding an extra enum value can't hurt.
>
> > + * certain whether we're dealing with a native HDMI port or
> > + * a type 1 DVI dual mode adaptor. The driver will have to use
> > + * some other hardware/driver specific mechanism to make that
> > + * distinction.
> > + *
> > + * Returns:
> > + * The type of the DP dual mode adaptor used
> > + */
> > +enum drm_dp_dual_mode_type drm_dp_dual_mode_detect(struct
> > i2c_adapter *adapter)
> > +{
> > + char hdmi_id[DP_DUAL_MODE_HDMI_ID_LEN] = {};
> > + uint8_t adaptor_id = 0x00;
> > + ssize_t ret;
> > +
> > + /*
> > + * Let's see if the adaptor is there the by reading the
> > + * HDMI ID registers.
> > + *
> > + * Note that type 1 DVI adaptors are not required to
> > implemnt
> > + * any registers, and that presents a problem for detection.
> > + * If the i2c transfer is nacked, we may or may not be
> > dealing
> > + * with a type 1 DVI adaptor. Some other mechanism of
> > detecting
> > + * the presence of the adaptor is required. One way would be
> > + * to check the state of the CONFIG1 pin, Another method
> > would
> > + * simply require the driver to know whether the port is a
> > DP++
> > + * port or a native HDMI port. Both of these methods are
> > entirely
> > + * hardware/driver specific so we can't deal with them here.
> > + */
> > + ret = drm_dp_dual_mode_read(adapter, DP_DUAL_MODE_HDMI_ID,
> > + hdmi_id, sizeof(hdmi_id));
> > + if (ret)
> > + return DRM_DP_DUAL_MODE_NONE;
> > +
> > + /*
> > + * Sigh. Some (maybe all?) type 1 adaptors are broken and
> > ack
> > + * the offset but ignore it, and instead they just always
> > return
> > + * data from the start of the HDMI ID buffer. So for a
> > broken
> > + * type 1 HDMI adaptor a single byte read will always give
> > us
> > + * 0x44, and for a type 1 DVI adaptor it should give 0x00
> > + * (assuming it implements any registers).
>
> So shouldn't we just try to read from 0x00 to 0x1F in a single shot?
> Would this work for your specific adaptor? It would be interesting to
> know.
I think I did consider that after giving up on another strange detection
scheme that would have perhaps allowed me to detect decent type 1
adaptors. IIRC the adaptors I tested returned 0x00 or 0xff for the
0x10-0x20 range when doing a single read, but I suspect they might as
well just wrap after 0x0f since the spec says they don't need to implement
anything beyond 0x00-0x0f. While all of those results would work just as
well as reading the single byte, I decided that there's no point in doing
that since I had not seem a single sane type 1 adaptor. They're clearly
all just bottom of the barrel hardware so seems unlikely anyone would
go to the effort of implementing one decently. So in the end I just
figured that minimizing the amount of data we have to read is the sane
thing to do.
>
>
> > Fortunately neither
> > + * of those values will match the type 2 signature of the
> > + * DP_DUAL_MODE_ADAPTOR_ID register so we can proceed with
> > + * the type 2 adaptor detection safely even in the presence
> > + * of broken type 1 adaptors.
> > + */
> > + ret = drm_dp_dual_mode_read(adapter,
> > DP_DUAL_MODE_ADAPTOR_ID,
> > + &adaptor_id,
> > sizeof(adaptor_id));
> > + if (ret || (adaptor_id != (DP_DUAL_MODE_TYPE_TYPE2 |
> > + DP_DUAL_MODE_REV_TYPE2))) {
> > + if (is_hdmi_adaptor(hdmi_id))
> > + return DRM_DP_DUAL_MODE_TYPE1_HDMI;
> > + else
> > + return DRM_DP_DUAL_MODE_TYPE1_DVI;
> > + } else {
> > + if (is_hdmi_adaptor(hdmi_id))
> > + return DRM_DP_DUAL_MODE_TYPE2_HDMI;
> > + else
> > + return DRM_DP_DUAL_MODE_TYPE2_DVI;
> > + }
> > +}
> > +EXPORT_SYMBOL(drm_dp_dual_mode_detect);
> > +
> > +/**
> > + * drm_dp_dual_mode_max_tmds_clock - Max TMDS clock for DP dual mode
> > adaptor
> > + * adapter: I2C adapter for the DDC bus
> > + *
> > + * Determine the max TMDS clock the adaptor supports based on the
> > + * DP_DUAL_MODE_MAX_TMDS_CLOCK register. The register is mandatory
> > for
> > + * type 2 adaptors, optional for type 1 adaptors. Hoever, as some
> > type 1
> > + * adaptors are broken (see comments in drm_dp_dual_mode_detect()
> > for the
> > + * details) one probably shouldn't use this with type 1 adaptors at
> > all.
> > + * Type 1 adaptors should anyway be always limited to 165 MHz.
>
> I always assume programmers are as bad as possible, so I wonder if we
> should just also call drm_dp_dual_mode_detect() here.
This crossed my mind but I didn't want to slow down things needlessly.
I did in fact consider that we might want to raise the abstraction
level a bit and introduce some kind of dp_dual_mode object that keeps
around the relevant information/state and would allow drivers to avoid
the type checks and whatnot. Unfortunately those cursed type 1 DVI
adaptors would still require the driver to step in if the detection
fails to find anything, so we'd need a callback into the driver or
something.
And so, since the driver anyway has to deal with the type 1 DVI adaptors,
I decided that trying to hide these sort of details inside the helper
is pretty much pointless.
> Also try the
> trick of reading the whole thing at once instead of the specific
> address. Same goes for the other functions. I also see that this would
> make patches 2-4 different, so this is just an idea, not a requirement.
As I suspect some adaptors might just wrap around at 0xf, doing a
big read doesn't feel entirely safe here.
>
> > + *
> > + * Returns:
> > + * Maximum supported TMDS clock rate for the DP dual mode adaptor in
> > kHz.
> > + */
> > +int drm_dp_dual_mode_max_tmds_clock(struct i2c_adapter *adapter)
> > +{
> > + uint8_t max_tmds_clock;
> > + ssize_t ret;
> > +
> > + /*
> > + * Type 1 adaptors are limited to 165MHz
> >
> > + * Type 2 adaptors can tells us their limit
>
> "can tells"
>
> > + */
> > + ret = drm_dp_dual_mode_read(adapter,
> > DP_DUAL_MODE_MAX_TMDS_CLOCK,
> > + &max_tmds_clock,
> > sizeof(max_tmds_clock));
> > + if (ret)
>
> Maybe also "if (ret || max_tmds_clock == 0 || max_tmds_clock == 0xFF)"?
That would seem sensible indeed.
>
>
> > + return 165000;
> > +
> > + return max_tmds_clock * 5000 / 2;
> > +}
> > +EXPORT_SYMBOL(drm_dp_dual_mode_max_tmds_clock);
> > +
> > +/**
> > + * drm_dp_dual_mode_get_tmds_output - Get the state of the TMDS
> > output buffers in the DP dual mode adaptor
> > + * adapter: I2C adapter for the DDC bus
> > + * enabled: current state of the TMDS output buffers
> > + *
> > + * Get the state of the TMDS output buffers in the adaptor.
> > + * DP_DUAL_MODE_TMDS_OEN register is mandatory for type 2 adaptors,
> > + * optionals for type 1 adaptors. Hoever, as some type 1 adaptors
> > are
> > + * broken (see comments in drm_dp_dual_mode_detect() for the
> > details)
> > + * one probably shouldn't use this with type 1 adaptors at all.
> > + *
> > + * Returns:
> > + * 0 on success, negative error code on failure
> > + */
> > +int drm_dp_dual_mode_get_tmds_output(struct i2c_adapter *adapter,
> > bool *enabled)
> > +{
> > + uint8_t tmds_oen;
> > + ssize_t ret;
> > +
> > + ret = drm_dp_dual_mode_read(adapter, DP_DUAL_MODE_TMDS_OEN,
> > + &tmds_oen, sizeof(tmds_oen));
> > + if (ret)
> > + return ret;
> > +
> > + *enabled = !(tmds_oen & DP_DUAL_MODE_TMDS_DISABLE);
> > +
> > + return 0;
> > +}
> > +EXPORT_SYMBOL(drm_dp_dual_mode_get_tmds_output);
> > +
> > +/**
> > + * drm_dp_dual_mode_set_tmds_output - Enable/disable TMDS output
> > buffers in the DP dual mode adaptor
> > + * adapter: I2C adapter for the DDC bus
> > + * enable: enable (as opposed to disable) the TMDS output buffers
> > + *
> > + * Set the state of the TMDS output buffers in the adaptor.
> > + * DP_DUAL_MODE_TMDS_OEN register is mandatory for type 2 adaptors,
> > + * optionals for type 1 adaptors. Hoever, as some type 1 adaptors
> > are
> > + * broken (see comments in drm_dp_dual_mode_detect() for the
> > details)
> > + * one probably shouldn't use this with type 1 adaptors at all.
> > + *
> > + * Returns:
> > + * 0 on success, negative error code on failure
> > + */
> > +int drm_dp_dual_mode_set_tmds_output(struct i2c_adapter *adapter,
> > bool enable)
> > +{
> > + uint8_t tmds_oen = enable ? 0 : DP_DUAL_MODE_TMDS_DISABLE;
> > + ssize_t ret;
> > +
> > + ret = drm_dp_dual_mode_write(adapter, DP_DUAL_MODE_TMDS_OEN,
> > + &tmds_oen, sizeof(tmds_oen));
> > + if (ret)
> > + return ret;
> > +
> > + return 0;
> > +}
> > +EXPORT_SYMBOL(drm_dp_dual_mode_set_tmds_output);
> > +
> > +/**
> > + * drm_dp_get_dual_mode_type_name - Get the name of the DP dual mode
> > adaptor type as a string
> > + * type: DP dual mode adaptor type
> > + *
> > + * Returns:
> > + * String representation of the DP dual mode adaptor type
> > + */
> > +const char *drm_dp_get_dual_mode_type_name(enum
> > drm_dp_dual_mode_type type)
> > +{
> > + switch (type) {
> > + case DRM_DP_DUAL_MODE_NONE:
> > + return "none";
> > + case DRM_DP_DUAL_MODE_TYPE1_DVI:
> > + return "type 1 DVI";
> > + case DRM_DP_DUAL_MODE_TYPE1_HDMI:
> > + return "type 1 HDMI";
> > + case DRM_DP_DUAL_MODE_TYPE2_DVI:
> > + return "type 2 DVI";
> > + case DRM_DP_DUAL_MODE_TYPE2_HDMI:
> > + return "type 2 HDMI";
> > + default:
> > + return "unknown";
>
> Please at least WARN_ON(1)?
We don't generally warn in these case (in the drm core).
>
> And, if you implement my suggestion of adding an actual unknown value
> to the enum, don't forget to change the default case to return
> something that's not "unknown".
>
> Most of the things I wrote above are just ideas, not requirements, and
> having this patch as-is looks better than not having it, so if you at
> least fix the spelling errors:
>
> Reviewed-by: Paulo Zanoni <paulo.r.zanoni at intel.com>
>
> > + };
> > +
> > +}
> > +EXPORT_SYMBOL(drm_dp_get_dual_mode_type_name);
> > diff --git a/include/drm/drm_dp_dual_mode_helper.h
> > b/include/drm/drm_dp_dual_mode_helper.h
> > new file mode 100644
> > index 000000000000..a2f6b4587f5f
> > --- /dev/null
> > +++ b/include/drm/drm_dp_dual_mode_helper.h
> > @@ -0,0 +1,80 @@
> > +/*
> > + * Copyright © 2016 Intel Corporation
> > + *
> > + * Permission is hereby granted, free of charge, to any person
> > obtaining a
> > + * copy of this software and associated documentation files (the
> > "Software"),
> > + * to deal in the Software without restriction, including without
> > limitation
> > + * the rights to use, copy, modify, merge, publish, distribute,
> > sublicense,
> > + * and/or sell copies of the Software, and to permit persons to whom
> > the
> > + * Software is furnished to do so, subject to the following
> > conditions:
> > + *
> > + * The above copyright notice and this permission notice shall be
> > included in
> > + * all copies or substantial portions of the Software.
> > + *
> > + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
> > EXPRESS OR
> > + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
> > MERCHANTABILITY,
> > + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO
> > EVENT SHALL
> > + * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM,
> > DAMAGES OR
> > + * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
> > OTHERWISE,
> > + * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
> > USE OR
> > + * OTHER DEALINGS IN THE SOFTWARE.
> > + */
> > +
> > +#ifndef DRM_DP_DUAL_MODE_HELPER_H
> > +#define DRM_DP_DUAL_MODE_HELPER_H
> > +
> > +#include <linux/types.h>
> > +
> > +/*
> > + * Optional for type 1 DVI adaptors
> > + * Mandatory for type 1 HDMI and type 2 adators
> > + */
> > +#define DP_DUAL_MODE_HDMI_ID 0x00 /* 00-0f */
> > +#define DP_DUAL_MODE_HDMI_ID_LEN 16
> > +/*
> > + * Optional for type 1 adaptors
> > + * Mandatory for type 2 adators
> > + */
> > +#define DP_DUAL_MODE_ADAPTOR_ID 0x10
> > +#define DP_DUAL_MODE_REV_MASK 0x07
> > +#define DP_DUAL_MODE_REV_TYPE2 0x00
> > +#define DP_DUAL_MODE_TYPE_MASK 0xf0
> > +#define DP_DUAL_MODE_TYPE_TYPE2 0xa0
> > +#define DP_DUAL_MODE_IEEE_OUI 0x11 /* 11-13*/
> > +#define DP_DUAL_IEEE_OUI_LEN 3
> > +#define DP_DUAL_DEVICE_ID 0x14 /* 14-19 */
> > +#define DP_DUAL_DEVICE_ID_LEN 6
> > +#define DP_DUAL_MODE_HARDWARE_REV 0x1a
> > +#define DP_DUAL_MODE_FIRMWARE_MAJOR_REV 0x1b
> > +#define DP_DUAL_MODE_FIRMWARE_MINOR_REV 0x1c
> > +#define DP_DUAL_MODE_MAX_TMDS_CLOCK 0x1d
> > +#define DP_DUAL_MODE_I2C_SPEED_CAP 0x1e
> > +#define DP_DUAL_MODE_TMDS_OEN 0x20
> > +#define DP_DUAL_MODE_TMDS_DISABLE 0x01
> > +#define DP_DUAL_MODE_HDMI_PIN_CTRL 0x21
> > +#define DP_DUAL_MODE_CEC_ENABLE 0x01
> > +#define DP_DUAL_MODE_I2C_SPEED_CTRL 0x22
> > +#define DP_DUAL_MODE_LAST_RESERVED 0xff
> > +
> > +struct i2c_adapter;
> > +
> > +ssize_t drm_dp_dual_mode_read(struct i2c_adapter *adapter,
> > + u8 offset, void *buffer, size_t size);
> > +ssize_t drm_dp_dual_mode_write(struct i2c_adapter *adapter,
> > + u8 offset, const void *buffer, size_t
> > size);
> > +
> > +enum drm_dp_dual_mode_type {
> > + DRM_DP_DUAL_MODE_NONE,
> > + DRM_DP_DUAL_MODE_TYPE1_DVI,
> > + DRM_DP_DUAL_MODE_TYPE1_HDMI,
> > + DRM_DP_DUAL_MODE_TYPE2_DVI,
> > + DRM_DP_DUAL_MODE_TYPE2_HDMI,
> > +};
> > +
> > +enum drm_dp_dual_mode_type drm_dp_dual_mode_detect(struct
> > i2c_adapter *adapter);
> > +int drm_dp_dual_mode_max_tmds_clock(struct i2c_adapter *adapter);
> > +int drm_dp_dual_mode_get_tmds_output(struct i2c_adapter *adapter,
> > bool *enabled);
> > +int drm_dp_dual_mode_set_tmds_output(struct i2c_adapter *adapter,
> > bool enable);
> > +const char *drm_dp_get_dual_mode_type_name(enum
> > drm_dp_dual_mode_type type);
> > +
> > +#endif
--
Ville Syrjälä
Intel OTC
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