Re: [PATCH v10 1/7] drm: bridge: Cadence: Creat mhdp helper driver

[Alexander Stein]

Hi Sandor,

Am Montag, 16. Oktober 2023, 05:05:54 CEST schrieb Sandor Yu:
> Hi Alexander,
> 
> Thanks your comments,
> 
> > Hi Sandor,
> > 
> > thanks for the updated series.
> > 
> > Am Freitag, 13. Oktober 2023, 05:24:20 CEST schrieb Sandor Yu:
> > > MHDP8546 mailbox access functions will be share to other mhdp driver
> > > and Cadence HDP-TX HDMI/DP PHY drivers.
> > > Create a new mhdp helper driver and move all those functions into.
> > > 
> > > cdns_mhdp_reg_write() is renamed to cdns_mhdp_dp_reg_write(), because
> > > it use the DPTX command ID DPTX_WRITE_REGISTER.
> > > 
> > > New cdns_mhdp_reg_write() is created with the general command ID
> > > GENERAL_REGISTER_WRITE.
> > > 
> > > Signed-off-by: Sandor Yu <Sandor.yu@xxxxxxx>
> > > ---
> > > 
> > > v9->v10:
> > >  *use mhdp helper driver to replace macro functions,  move maibox
> > > 
> > > access function and mhdp hdmi/dp common API  functions into the
> > > driver.
> > > 
> > >  drivers/gpu/drm/bridge/cadence/Kconfig        |   4
> > >  drivers/gpu/drm/bridge/cadence/Makefile       |   1 +
> > >  .../gpu/drm/bridge/cadence/cdns-mhdp-helper.c | 306 ++++++++++++++
> > >  .../drm/bridge/cadence/cdns-mhdp8546-core.c   | 383 +++---------------
> > >  .../drm/bridge/cadence/cdns-mhdp8546-core.h   |  44 +-
> > >  include/drm/bridge/cdns-mhdp-helper.h         |  96 +++++
> > >  6 files changed, 473 insertions(+), 361 deletions(-)  create mode
> > > 
> > > 100644 drivers/gpu/drm/bridge/cadence/cdns-mhdp-helper.c
> > > 
> > >  create mode 100644 include/drm/bridge/cdns-mhdp-helper.h
> > > 
> > > diff --git a/drivers/gpu/drm/bridge/cadence/Kconfig
> > > b/drivers/gpu/drm/bridge/cadence/Kconfig index
> > > ec35215a20034..0b7b4626a7af0
> > > 100644
> > > --- a/drivers/gpu/drm/bridge/cadence/Kconfig
> > > +++ b/drivers/gpu/drm/bridge/cadence/Kconfig
> > > @@ -20,6 +20,9 @@ config DRM_CDNS_DSI_J721E
> > > 
> > >         the routing of the DSS DPI signal to the Cadence DSI.
> > >  
> > >  endif
> > > 
> > > +config CDNS_MHDP_HELPER
> > > +     tristate
> > > +
> > > 
> > >  config DRM_CDNS_MHDP8546
> > >  
> > >       tristate "Cadence DPI/DP bridge"
> > >       select DRM_DISPLAY_DP_HELPER
> > > 
> > > @@ -27,6 +30,7 @@ config DRM_CDNS_MHDP8546
> > > 
> > >       select DRM_DISPLAY_HELPER
> > >       select DRM_KMS_HELPER
> > >       select DRM_PANEL_BRIDGE
> > > 
> > > +     select CDNS_MHDP_HELPER
> > > 
> > >       depends on OF
> > >       help
> > >       
> > >         Support Cadence DPI to DP bridge. This is an internal diff
> > > 
> > > --git a/drivers/gpu/drm/bridge/cadence/Makefile
> > > b/drivers/gpu/drm/bridge/cadence/Makefile index
> > > c95fd5b81d137..087dc074820d7 100644
> > > --- a/drivers/gpu/drm/bridge/cadence/Makefile
> > > +++ b/drivers/gpu/drm/bridge/cadence/Makefile
> > > @@ -2,6 +2,7 @@
> > > 
> > >  obj-$(CONFIG_DRM_CDNS_DSI) += cdns-dsi.o  cdns-dsi-y :=
> > > 
> > > cdns-dsi-core.o
> > > 
> > >  cdns-dsi-$(CONFIG_DRM_CDNS_DSI_J721E) += cdns-dsi-j721e.o
> > > 
> > > +obj-$(CONFIG_CDNS_MHDP_HELPER) += cdns-mhdp-helper.o
> > > 
> > >  obj-$(CONFIG_DRM_CDNS_MHDP8546) += cdns-mhdp8546.o
> > 
> > cdns-mhdp8546-y
> > 
> > > := cdns-mhdp8546-core.o cdns-mhdp8546-hdcp.o
> > > :
> > >  cdns-mhdp8546-$(CONFIG_DRM_CDNS_MHDP8546_J721E) +=
> > > 
> > > cdns-mhdp8546-j721e.o diff --git
> > > a/drivers/gpu/drm/bridge/cadence/cdns-mhdp-helper.c
> > > b/drivers/gpu/drm/bridge/cadence/cdns-mhdp-helper.c new file mode
> > > 100644 index 0000000000000..2e3eee40494f0
> > > --- /dev/null
> > > +++ b/drivers/gpu/drm/bridge/cadence/cdns-mhdp-helper.c
> > > @@ -0,0 +1,306 @@
> > > +// SPDX-License-Identifier: GPL-2.0-only
> > > +/*
> > > + * Copyright (C) 2023 NXP Semiconductor, Inc.
> > > + *
> > > + */
> > > +#include <drm/bridge/cdns-mhdp-helper.h> #include
> > > +<linux/dev_printk.h> #include <linux/module.h>
> > > +
> > > +/* Mailbox helper functions */
> > > +int cdns_mhdp_mailbox_read(struct cdns_mhdp_base *base) {
> > > +     int ret, empty;
> > > +
> > > +     WARN_ON(!mutex_is_locked(base->mbox_mutex));
> > > +
> > > +     ret = readx_poll_timeout(readl, base->regs +
> > 
> > CDNS_MAILBOX_EMPTY,
> > 
> > > +                              empty, !empty, MAILBOX_RETRY_US,
> > > +                              MAILBOX_TIMEOUT_US);
> > > +     if (ret < 0)
> > > +             return ret;
> > > +
> > > +     return readl(base->regs + CDNS_MAILBOX_RX_DATA) & 0xff; }
> > > +EXPORT_SYMBOL_GPL(cdns_mhdp_mailbox_read);
> > 
> > No need to export this. You can make this function actually static.
> 
> OK, I will change it to static in the next version.
> 
> > > +
> > > +int cdns_mhdp_mailbox_write(struct cdns_mhdp_base *base, u8 val) {
> > > +     int ret, full;
> > > +
> > > +     WARN_ON(!mutex_is_locked(base->mbox_mutex));
> > > +
> > > +     ret = readx_poll_timeout(readl, base->regs + CDNS_MAILBOX_FULL,
> > > +                              full, !full, MAILBOX_RETRY_US,
> > > +                              MAILBOX_TIMEOUT_US);
> > > +     if (ret < 0)
> > > +             return ret;
> > > +
> > > +     writel(val, base->regs + CDNS_MAILBOX_TX_DATA);
> > > +
> > > +     return 0;
> > > +}
> > > +EXPORT_SYMBOL_GPL(cdns_mhdp_mailbox_write);
> > 
> > No need to export that one as well. You can make this function actually
> > static as these two functions are only called from the helper itself.
> 
> mhdp8546 driver need this function.

True, cdns_mhdp_set_firmware_active() needs this. But this call seems a bit 
fishy. Couldn't this be written as follow?

---8<--
diff --git a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c b/drivers/
gpu/drm/bridge/cadence/cdns-mhdp8546-core.c
index 0582a5e42763f..c0364d05406cd 100644
--- a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c
+++ b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c
@@ -78,22 +78,16 @@ static void cdns_mhdp_bridge_hpd_disable(struct drm_bridge 
*bridge)
 static
 int cdns_mhdp_set_firmware_active(struct cdns_mhdp_device *mhdp, bool enable)
 {
-       u8 msg[5];
+       u8 msg[1];
        int ret, i;
 
-       msg[0] = GENERAL_MAIN_CONTROL;
-       msg[1] = MB_MODULE_ID_GENERAL;
-       msg[2] = 0;
-       msg[3] = 1;
-       msg[4] = enable ? FW_ACTIVE : FW_STANDBY;
+       msg[0] = enable ? FW_ACTIVE : FW_STANDBY;
 
        mutex_lock(&mhdp->mbox_mutex);
 
-       for (i = 0; i < sizeof(msg); i++) {
-               ret = cdns_mhdp_mailbox_write(&mhdp->base, msg[i]);
-               if (ret)
-                       goto out;
-       }
+       ret = cdns_mhdp_mailbox_send(base, MB_MODULE_ID_GENERAL,
+                                    GENERAL_MAIN_CONTROL,
+                                    sizeof(msg), msg);
 
        /* read the firmware state */
        ret = cdns_mhdp_mailbox_recv_data(&mhdp->base, msg, sizeof(msg));
---8<--

AFAICS cdns_mhdp_mailbox_send() is only a sequence of writes, writing 4 byte 
header and 1 byte data in this case.

Best regards,
Alexander

> 
> > > +
> > > +int cdns_mhdp_mailbox_recv_header(struct cdns_mhdp_base *base,
> > > +                               u8 module_id, u8 opcode,
> > > +                               u16 req_size) {
> > > +     u32 mbox_size, i;
> > > +     u8 header[4];
> > > +     int ret;
> > > +
> > > +     /* read the header of the message */
> > > +     for (i = 0; i < sizeof(header); i++) {
> > > +             ret = cdns_mhdp_mailbox_read(base);
> > > +             if (ret < 0)
> > > +                     return ret;
> > > +
> > > +             header[i] = ret;
> > > +     }
> > > +
> > > +     mbox_size = get_unaligned_be16(header + 2);
> > > +
> > > +     if (opcode != header[0] || module_id != header[1] ||
> > > +         req_size != mbox_size) {
> > > +             /*
> > > +              * If the message in mailbox is not what we want, we
> > > + need
> > 
> > to
> > 
> > > +              * clear the mailbox by reading its contents.
> > > +              */
> > > +             for (i = 0; i < mbox_size; i++)
> > > +                     if (cdns_mhdp_mailbox_read(base) < 0)
> > > +                             break;
> > > +
> > > +             return -EINVAL;
> > > +     }
> > > +
> > > +     return 0;
> > > +}
> > > +EXPORT_SYMBOL_GPL(cdns_mhdp_mailbox_recv_header);
> > > +
> > > +int cdns_mhdp_mailbox_recv_data(struct cdns_mhdp_base *base,
> > > +                             u8 *buff, u16 buff_size) {
> > > +     u32 i;
> > > +     int ret;
> > > +
> > > +     for (i = 0; i < buff_size; i++) {
> > > +             ret = cdns_mhdp_mailbox_read(base);
> > > +             if (ret < 0)
> > > +                     return ret;
> > > +
> > > +             buff[i] = ret;
> > > +     }
> > > +
> > > +     return 0;
> > > +}
> > > +EXPORT_SYMBOL_GPL(cdns_mhdp_mailbox_recv_data);
> > > +
> > > +int cdns_mhdp_mailbox_send(struct cdns_mhdp_base *base, u8
> > 
> > module_id,
> > 
> > > +                        u8 opcode, u16 size, u8 *message) {
> > > +     u8 header[4];
> > > +     int ret, i;
> > > +
> > > +     header[0] = opcode;
> > > +     header[1] = module_id;
> > > +     put_unaligned_be16(size, header + 2);
> > > +
> > > +     for (i = 0; i < sizeof(header); i++) {
> > > +             ret = cdns_mhdp_mailbox_write(base, header[i]);
> > > +             if (ret)
> > > +                     return ret;
> > > +     }
> > > +
> > > +     for (i = 0; i < size; i++) {
> > > +             ret = cdns_mhdp_mailbox_write(base, message[i]);
> > > +             if (ret)
> > > +                     return ret;
> > > +     }
> > > +
> > > +     return 0;
> > > +}
> > > +EXPORT_SYMBOL_GPL(cdns_mhdp_mailbox_send);
> > > +
> > > +/* General helper functions */
> > > +int cdns_mhdp_reg_read(struct cdns_mhdp_base *base, u32 addr, u32
> > > +*value) {
> > > +     u8 msg[4], resp[8];
> > > +     int ret;
> > > +
> > > +     put_unaligned_be32(addr, msg);
> > > +
> > > +     mutex_lock(base->mbox_mutex);
> > > +
> > > +     ret = cdns_mhdp_mailbox_send(base, MB_MODULE_ID_GENERAL,
> > > +                                  GENERAL_REGISTER_READ,
> > > +                                  sizeof(msg), msg);
> > > +     if (ret)
> > > +             goto out;
> > > +
> > > +     ret = cdns_mhdp_mailbox_recv_header(base,
> > 
> > MB_MODULE_ID_GENERAL,
> > 
> > > +
> > 
> > GENERAL_REGISTER_READ,
> > 
> > > +                                         sizeof(resp));
> > > +     if (ret)
> > > +             goto out;
> > > +
> > > +     ret = cdns_mhdp_mailbox_recv_data(base, resp, sizeof(resp));
> > > +     if (ret)
> > > +             goto out;
> > > +
> > > +     /* Returned address value should be the same as requested */
> > > +     if (memcmp(msg, resp, sizeof(msg))) {
> > > +             ret = -EINVAL;
> > > +             goto out;
> > > +     }
> > > +
> > > +     *value = get_unaligned_be32(resp + 4);
> > > +
> > > +out:
> > > +     mutex_unlock(base->mbox_mutex);
> > > +     if (ret) {
> > > +             dev_err(base->dev, "Failed to read register\n");
> > > +             *value = 0;
> > > +     }
> > > +
> > > +     return ret;
> > > +}
> > > +EXPORT_SYMBOL_GPL(cdns_mhdp_reg_read);
> > > +
> > > +int cdns_mhdp_reg_write(struct cdns_mhdp_base *base, u32 addr, u32
> > > +val) {
> > > +     u8 msg[8];
> > > +     int ret;
> > > +
> > > +     put_unaligned_be32(addr, msg);
> > > +     put_unaligned_be32(val, msg + 4);
> > > +
> > > +     mutex_lock(base->mbox_mutex);
> > > +
> > > +     ret = cdns_mhdp_mailbox_send(base, MB_MODULE_ID_GENERAL,
> > > +                                  GENERAL_REGISTER_WRITE,
> > > +                                  sizeof(msg), msg);
> > > +
> > > +     mutex_unlock(base->mbox_mutex);
> > > +
> > > +     return ret;
> > > +}
> > > +EXPORT_SYMBOL_GPL(cdns_mhdp_reg_write);
> > > +
> > > +/* DPTX helper functions */
> > > +int cdns_mhdp_dp_reg_write(struct cdns_mhdp_base *base, u16 addr,
> > 
> > u32
> > 
> > > +val) {
> > > +     u8 msg[6];
> > > +     int ret;
> > > +
> > > +     put_unaligned_be16(addr, msg);
> > > +     put_unaligned_be32(val, msg + 2);
> > > +
> > > +     mutex_lock(base->mbox_mutex);
> > > +
> > > +     ret = cdns_mhdp_mailbox_send(base, MB_MODULE_ID_DP_TX,
> > > +                                  DPTX_WRITE_REGISTER,
> > 
> > sizeof(msg),
> > msg);
> > 
> > > +
> > > +     mutex_unlock(base->mbox_mutex);
> > > +
> > > +     return ret;
> > > +}
> > > +EXPORT_SYMBOL_GPL(cdns_mhdp_dp_reg_write);
> > > +
> > > +int cdns_mhdp_dp_reg_write_bit(struct cdns_mhdp_base *base, u16 addr,
> > > +                            u8 start_bit, u8 bits_no, u32 val) {
> > > +     u8 field[8];
> > > +     int ret;
> > > +
> > > +     put_unaligned_be16(addr, field);
> > > +     field[2] = start_bit;
> > > +     field[3] = bits_no;
> > > +     put_unaligned_be32(val, field + 4);
> > > +
> > > +     mutex_lock(base->mbox_mutex);
> > > +
> > > +     ret = cdns_mhdp_mailbox_send(base, MB_MODULE_ID_DP_TX,
> > > +                                  DPTX_WRITE_FIELD,
> > 
> > sizeof(field),
> > field);
> > 
> > > +
> > > +     mutex_unlock(base->mbox_mutex);
> > > +
> > > +     return ret;
> > > +}
> > > +EXPORT_SYMBOL_GPL(cdns_mhdp_dp_reg_write_bit);
> > > +
> > > +int cdns_mhdp_dpcd_read(struct cdns_mhdp_base *base,
> > > +                     u32 addr, u8 *data, u16 len) {
> > > +     u8 msg[5], reg[5];
> > > +     int ret;
> > > +
> > > +     put_unaligned_be16(len, msg);
> > > +     put_unaligned_be24(addr, msg + 2);
> > > +
> > > +     mutex_lock(base->mbox_mutex);
> > > +
> > > +     ret = cdns_mhdp_mailbox_send(base, MB_MODULE_ID_DP_TX,
> > > +                                  DPTX_READ_DPCD, sizeof(msg),
> > 
> > msg);
> > 
> > > +     if (ret)
> > > +             goto out;
> > > +
> > > +     ret = cdns_mhdp_mailbox_recv_header(base,
> > 
> > MB_MODULE_ID_DP_TX,
> > 
> > > +                                         DPTX_READ_DPCD,
> > > +                                         sizeof(reg) + len);
> > > +     if (ret)
> > > +             goto out;
> > > +
> > > +     ret = cdns_mhdp_mailbox_recv_data(base, reg, sizeof(reg));
> > > +     if (ret)
> > > +             goto out;
> > > +
> > > +     ret = cdns_mhdp_mailbox_recv_data(base, data, len);
> > > +
> > > +out:
> > > +     mutex_unlock(base->mbox_mutex);
> > > +
> > > +     return ret;
> > > +}
> > > +EXPORT_SYMBOL_GPL(cdns_mhdp_dpcd_read);
> > > +
> > > +int cdns_mhdp_dpcd_write(struct cdns_mhdp_base *base, u32 addr, u8
> > > +value) {
> > > +     u8 msg[6], reg[5];
> > > +     int ret;
> > > +
> > > +     put_unaligned_be16(1, msg);
> > > +     put_unaligned_be24(addr, msg + 2);
> > > +     msg[5] = value;
> > > +
> > > +     mutex_lock(base->mbox_mutex);
> > > +
> > > +     ret = cdns_mhdp_mailbox_send(base, MB_MODULE_ID_DP_TX,
> > > +                                  DPTX_WRITE_DPCD,
> > 
> > sizeof(msg),
> > msg);
> > 
> > > +     if (ret)
> > > +             goto out;
> > > +
> > > +     ret = cdns_mhdp_mailbox_recv_header(base,
> > 
> > MB_MODULE_ID_DP_TX,
> > 
> > > +                                         DPTX_WRITE_DPCD,
> > 
> > sizeof(reg));
> > 
> > > +     if (ret)
> > > +             goto out;
> > > +
> > > +     ret = cdns_mhdp_mailbox_recv_data(base, reg, sizeof(reg));
> > > +     if (ret)
> > > +             goto out;
> > > +
> > > +     if (addr != get_unaligned_be24(reg + 2))
> > > +             ret = -EINVAL;
> > > +
> > > +out:
> > > +     mutex_unlock(base->mbox_mutex);
> > > +
> > > +     if (ret)
> > > +             dev_err(base->dev, "dpcd write failed: %d\n", ret);
> > > +     return ret;
> > > +}
> > > +EXPORT_SYMBOL_GPL(cdns_mhdp_dpcd_write);
> > > +
> > > +MODULE_DESCRIPTION("Cadence MHDP Helper driver");
> > > +MODULE_AUTHOR("Sandor Yu <Sandor.yu@xxxxxxx>");
> > > +MODULE_LICENSE("GPL");
> > > [...]
> > > diff --git a/include/drm/bridge/cdns-mhdp-helper.h
> > > b/include/drm/bridge/cdns-mhdp-helper.h new file mode 100644 index
> > > 0000000000000..b89db9e842266
> > > --- /dev/null
> > > +++ b/include/drm/bridge/cdns-mhdp-helper.h
> > > @@ -0,0 +1,96 @@
> > > +// SPDX-License-Identifier: GPL-2.0-only
> > > +/*
> > > + * Copyright (C) 2023 NXP Semiconductor, Inc.
> > > + */
> > > +#ifndef __CDNS_MHDP_HELPER_H__
> > > +#define __CDNS_MHDP_HELPER_H__
> > > +
> > > +#include <asm/unaligned.h>
> > > +#include <linux/iopoll.h>
> > > +
> > > +/* mailbox regs offset */
> > > +#define CDNS_MAILBOX_FULL                    0x00008
> > > +#define CDNS_MAILBOX_EMPTY                   0x0000c
> > > +#define CDNS_MAILBOX_TX_DATA                 0x00010
> > > +#define CDNS_MAILBOX_RX_DATA                 0x00014
> > > +
> > > +#define MAILBOX_RETRY_US                     1000
> > > +#define MAILBOX_TIMEOUT_US                   2000000
> > > +
> > > +/* Module ID Code */
> > > +#define MB_MODULE_ID_DP_TX                   0x01
> > > +#define MB_MODULE_ID_HDMI_TX                 0x03
> > > +#define MB_MODULE_ID_HDCP_TX                 0x07
> > > +#define MB_MODULE_ID_HDCP_RX                 0x08
> > > +#define MB_MODULE_ID_HDCP_GENERAL            0x09
> > > +#define MB_MODULE_ID_GENERAL                 0x0A
> > > +
> > > +/* General Commands */
> > > +#define GENERAL_MAIN_CONTROL                 0x01
> > > +#define GENERAL_TEST_ECHO                    0x02
> > > +#define GENERAL_BUS_SETTINGS                 0x03
> > > +#define GENERAL_TEST_ACCESS                  0x04
> > > +#define GENERAL_REGISTER_WRITE                       0x05
> > > +#define GENERAL_WRITE_FIELD                  0x06
> > > +#define GENERAL_REGISTER_READ                        0x07
> > > +#define GENERAL_GET_HPD_STATE                        0x11
> > > +
> > > +/* DPTX Commands */
> > > +#define DPTX_SET_POWER_MNG                   0x00
> > > +#define DPTX_SET_HOST_CAPABILITIES           0x01
> > > +#define DPTX_GET_EDID                                0x02
> > > +#define DPTX_READ_DPCD                               0x03
> > > +#define DPTX_WRITE_DPCD                              0x04
> > > +#define DPTX_ENABLE_EVENT                    0x05
> > > +#define DPTX_WRITE_REGISTER                  0x06
> > > +#define DPTX_READ_REGISTER                   0x07
> > > +#define DPTX_WRITE_FIELD                     0x08
> > > +#define DPTX_TRAINING_CONTROL                        0x09
> > > +#define DPTX_READ_EVENT                              0x0a
> > > +#define DPTX_READ_LINK_STAT                  0x0b
> > > +#define DPTX_SET_VIDEO                               0x0c
> > > +#define DPTX_SET_AUDIO                               0x0d
> > > +#define DPTX_GET_LAST_AUX_STAUS                      0x0e
> > > +#define DPTX_SET_LINK_BREAK_POINT            0x0f
> > > +#define DPTX_FORCE_LANES                     0x10
> > > +#define DPTX_HPD_STATE                               0x11
> > > +#define DPTX_ADJUST_LT                               0x12
> > > +
> > > +/* HDMI TX Commands */
> > > +#define HDMI_TX_READ                         0x00
> > > +#define HDMI_TX_WRITE                                0x01
> > > +#define HDMI_TX_UPDATE_READ                  0x02
> > > +#define HDMI_TX_EDID                         0x03
> > > +#define HDMI_TX_EVENTS                               0x04
> > > +#define HDMI_TX_HPD_STATUS                   0x05
> > > +
> > > +struct cdns_mhdp_base {
> > > +     struct device *dev;
> > > +     void __iomem *regs;
> > > +     /* protect mailbox communications with the firmware */
> > > +     struct mutex *mbox_mutex;
> > > +};
> > > +
> > > +/* Mailbox helper functions */
> > > +int cdns_mhdp_mailbox_read(struct cdns_mhdp_base *base); int
> > > +cdns_mhdp_mailbox_write(struct cdns_mhdp_base *base, u8 val);
> > 
> > You can remove these two declarations.
> 
> cdns_mhdp_mailbox_read will be removed. Thanks!
> 
> B.R
> Sandor
> 
> > Best regards,
> > Alexander
> > 
> > Best regards,
> > 
> > > +int cdns_mhdp_mailbox_recv_header(struct cdns_mhdp_base *base,
> > > +                               u8 module_id, u8 opcode, u16
> > 
> > req_size);
> > 
> > > +int cdns_mhdp_mailbox_recv_data(struct cdns_mhdp_base *base,
> > > +                             u8 *buff, u16 buff_size); int
> > > +cdns_mhdp_mailbox_send(struct cdns_mhdp_base *base, u8 module_id,
> > > +                        u8 opcode, u16 size, u8 *message);
> > > +
> > > +/* General commands helper functions */ int cdns_mhdp_reg_read(struct
> > > +cdns_mhdp_base *base, u32 addr, u32 *value); int
> > > +cdns_mhdp_reg_write(struct cdns_mhdp_base *base, u32 addr, u32 val);
> > > +
> > > +/* DPTX commands helper functions */
> > > +int cdns_mhdp_dp_reg_write(struct cdns_mhdp_base *base, u16 addr,
> > 
> > u32
> > 
> > > +val); int cdns_mhdp_dp_reg_write_bit(struct cdns_mhdp_base *base, u16
> > > +addr, +
> > > 
> > >       u8 start_bit, u8 bits_no, u32 val);
> > > 
> > > +int cdns_mhdp_dpcd_read(struct cdns_mhdp_base *base,
> > > +                     u32 addr, u8 *data, u16 len); int
> > > +cdns_mhdp_dpcd_write(struct cdns_mhdp_base *base, u32 addr, u8
> > > +value);
> > > +
> > > +#endif /* __CDNS_MHDP_HELPER_H__ */
> > 
> > TQ-Systems GmbH | Mühlstraße 2, Gut Delling | 82229 Seefeld, Germany
> > Amtsgericht München, HRB 105018
> > Geschäftsführer: Detlef Schneider, Rüdiger Stahl, Stefan Schneider


-- 
TQ-Systems GmbH | Mühlstraße 2, Gut Delling | 82229 Seefeld, Germany
Amtsgericht München, HRB 105018
Geschäftsführer: Detlef Schneider, Rüdiger Stahl, Stefan Schneider
http://www.tq-group.com/