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Message-ID: <fcfaadcc-ae71-431a-9354-c9f811109cdd@linaro.org>
Date: Thu, 28 Sep 2023 13:39:22 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Sandor Yu <Sandor.yu@....com>, andrzej.hajda@...el.com,
neil.armstrong@...aro.org, Laurent.pinchart@...asonboard.com,
jonas@...boo.se, jernej.skrabec@...il.com, airlied@...il.com,
daniel@...ll.ch, robh+dt@...nel.org,
krzysztof.kozlowski+dt@...aro.org, shawnguo@...nel.org,
s.hauer@...gutronix.de, festevam@...il.com, vkoul@...nel.org,
dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
linux-phy@...ts.infradead.org
Cc: oliver.brown@....com, alexander.stein@...tq-group.com,
linux-imx@....com, kernel@...gutronix.de, sam@...nborg.org
Subject: Re: [PATCH v9 1/7] drm: bridge: Cadence: convert mailbox functions to
macro functions
On 07/09/2023 04:05, Sandor Yu wrote:
> MHDP8546 mailbox access functions will be share to other mhdp driver
> and Cadence HDP-TX HDMI/DP PHY drivers.
> Move those functions to head file include/drm/bridge/cdns-mhdp-mailbox.h
> and convert them to macro functions.
>
> Signed-off-by: Sandor Yu <Sandor.yu@....com>
> ---
> .../drm/bridge/cadence/cdns-mhdp8546-core.c | 195 +-------------
> .../drm/bridge/cadence/cdns-mhdp8546-core.h | 1 -
> include/drm/bridge/cdns-mhdp-mailbox.h | 240 ++++++++++++++++++
> 3 files changed, 241 insertions(+), 195 deletions(-)
> create mode 100644 include/drm/bridge/cdns-mhdp-mailbox.h
>
> diff --git a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c
> index f6822dfa3805..ddd3c633c7bf 100644
> --- a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c
> +++ b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c
> @@ -36,6 +36,7 @@
> #include <linux/slab.h>
> #include <linux/wait.h>
>
> +#include <drm/bridge/cdns-mhdp-mailbox.h>
> #include <drm/display/drm_dp_helper.h>
> #include <drm/display/drm_hdcp_helper.h>
> #include <drm/drm_atomic.h>
> @@ -54,200 +55,6 @@
> #include "cdns-mhdp8546-hdcp.h"
> #include "cdns-mhdp8546-j721e.h"
>
> -static int cdns_mhdp_mailbox_read(struct cdns_mhdp_device *mhdp)
> -{
> - int ret, empty;
> -
> - WARN_ON(!mutex_is_locked(&mhdp->mbox_mutex));
> -
> - ret = readx_poll_timeout(readl, mhdp->regs + CDNS_MAILBOX_EMPTY,
> - empty, !empty, MAILBOX_RETRY_US,
> - MAILBOX_TIMEOUT_US);
> - if (ret < 0)
> - return ret;
> -
> - return readl(mhdp->regs + CDNS_MAILBOX_RX_DATA) & 0xff;
> -}
> -
> -static int cdns_mhdp_mailbox_write(struct cdns_mhdp_device *mhdp, u8 val)
> -{
> - int ret, full;
> -
> - WARN_ON(!mutex_is_locked(&mhdp->mbox_mutex));
> -
> - ret = readx_poll_timeout(readl, mhdp->regs + CDNS_MAILBOX_FULL,
> - full, !full, MAILBOX_RETRY_US,
> - MAILBOX_TIMEOUT_US);
> - if (ret < 0)
> - return ret;
> -
> - writel(val, mhdp->regs + CDNS_MAILBOX_TX_DATA);
> -
> - return 0;
> -}
> -
> -static int cdns_mhdp_mailbox_recv_header(struct cdns_mhdp_device *mhdp,
> - 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(mhdp);
> - 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(mhdp) < 0)
> - break;
> -
> - return -EINVAL;
> - }
> -
> - return 0;
> -}
> -
> -static int cdns_mhdp_mailbox_recv_data(struct cdns_mhdp_device *mhdp,
> - u8 *buff, u16 buff_size)
> -{
> - u32 i;
> - int ret;
> -
> - for (i = 0; i < buff_size; i++) {
> - ret = cdns_mhdp_mailbox_read(mhdp);
> - if (ret < 0)
> - return ret;
> -
> - buff[i] = ret;
> - }
> -
> - return 0;
> -}
> -
> -static int cdns_mhdp_mailbox_send(struct cdns_mhdp_device *mhdp, 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(mhdp, header[i]);
> - if (ret)
> - return ret;
> - }
> -
> - for (i = 0; i < size; i++) {
> - ret = cdns_mhdp_mailbox_write(mhdp, message[i]);
> - if (ret)
> - return ret;
> - }
> -
> - return 0;
> -}
> -
> -static
> -int cdns_mhdp_reg_read(struct cdns_mhdp_device *mhdp, u32 addr, u32 *value)
> -{
> - u8 msg[4], resp[8];
> - int ret;
> -
> - put_unaligned_be32(addr, msg);
> -
> - mutex_lock(&mhdp->mbox_mutex);
> -
> - ret = cdns_mhdp_mailbox_send(mhdp, MB_MODULE_ID_GENERAL,
> - GENERAL_REGISTER_READ,
> - sizeof(msg), msg);
> - if (ret)
> - goto out;
> -
> - ret = cdns_mhdp_mailbox_recv_header(mhdp, MB_MODULE_ID_GENERAL,
> - GENERAL_REGISTER_READ,
> - sizeof(resp));
> - if (ret)
> - goto out;
> -
> - ret = cdns_mhdp_mailbox_recv_data(mhdp, 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(&mhdp->mbox_mutex);
> - if (ret) {
> - dev_err(mhdp->dev, "Failed to read register\n");
> - *value = 0;
> - }
> -
> - return ret;
> -}
> -
> -static
> -int cdns_mhdp_reg_write(struct cdns_mhdp_device *mhdp, u16 addr, u32 val)
> -{
> - u8 msg[6];
> - int ret;
> -
> - put_unaligned_be16(addr, msg);
> - put_unaligned_be32(val, msg + 2);
> -
> - mutex_lock(&mhdp->mbox_mutex);
> -
> - ret = cdns_mhdp_mailbox_send(mhdp, MB_MODULE_ID_DP_TX,
> - DPTX_WRITE_REGISTER, sizeof(msg), msg);
> -
> - mutex_unlock(&mhdp->mbox_mutex);
> -
> - return ret;
> -}
> -
> -static
> -int cdns_mhdp_reg_write_bit(struct cdns_mhdp_device *mhdp, 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(&mhdp->mbox_mutex);
> -
> - ret = cdns_mhdp_mailbox_send(mhdp, MB_MODULE_ID_DP_TX,
> - DPTX_WRITE_FIELD, sizeof(field), field);
> -
> - mutex_unlock(&mhdp->mbox_mutex);
> -
> - return ret;
> -}
> -
> static
> int cdns_mhdp_dpcd_read(struct cdns_mhdp_device *mhdp,
> u32 addr, u8 *data, u16 len)
> diff --git a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.h b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.h
> index bedddd510d17..10c878bf0e63 100644
> --- a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.h
> +++ b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.h
> @@ -212,7 +212,6 @@ struct phy;
> #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
>
> /* firmware and opcodes */
> #define FW_NAME "cadence/mhdp8546.bin"
> diff --git a/include/drm/bridge/cdns-mhdp-mailbox.h b/include/drm/bridge/cdns-mhdp-mailbox.h
> new file mode 100644
> index 000000000000..9f551bf956a1
> --- /dev/null
> +++ b/include/drm/bridge/cdns-mhdp-mailbox.h
> @@ -0,0 +1,240 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Cadence MHDP Firmware Access API function by Malibox.
> + *
> + * Copyright (C) 2022 NXP Semiconductor, Inc.
> + *
> + */
> +#ifndef CDNS_MHDP_MAILBOX_H
> +#define CDNS_MHDP_MAILBOX_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_GENERAL 0x0A
> +#define MB_MODULE_ID_DP_TX 0x01
> +
> +/* General Commands */
> +#define GENERAL_REGISTER_WRITE 0x05
> +#define GENERAL_REGISTER_READ 0x07
> +
> +/* DP TX Command */
> +#define DPTX_WRITE_FIELD 0x08
> +
> +/* MHDP Firmware access functions by Mailbox */
> +#define cdns_mhdp_mailbox_read(_mhdp) \
> +({ \
> + int ret, empty, val; \
> +\
> + WARN_ON(!mutex_is_locked(&(_mhdp)->mbox_mutex)); \
> +\
> + do { \
> + ret = readx_poll_timeout(readl, (_mhdp)->regs + CDNS_MAILBOX_EMPTY, \
> + empty, !empty, MAILBOX_RETRY_US, \
> + MAILBOX_TIMEOUT_US); \
> + if (ret < 0) \
> + break; \
> +\
> + val = readl((_mhdp)->regs + CDNS_MAILBOX_RX_DATA) & 0xff; \
> + } while (0); \
> +\
> + (ret < 0) ? ret : val; \
> +})
I'd strongly suggest against such complex functions. Could you please at
least use static inline functions?
Moreover, is this really a part of the drm bridge interface? Should this
be converted to the proper mailbox device / driver? Otherwise it feels
like sharing some internal piece of register space, unless I miss something.
> +
> +#define cdns_mhdp_mailbox_write(_mhdp, _val) \
> +({ \
> + int ret, full; \
> +\
> + WARN_ON(!mutex_is_locked(&(_mhdp)->mbox_mutex)); \
> +\
> + do { \
> + ret = readx_poll_timeout(readl, (_mhdp)->regs + CDNS_MAILBOX_FULL, \
> + full, !full, MAILBOX_RETRY_US, \
> + MAILBOX_TIMEOUT_US); \
> + if (ret < 0) \
> + break; \
> +\
> + writel((_val), (_mhdp)->regs + CDNS_MAILBOX_TX_DATA); \
> + } while (0); \
> +\
> + ret; \
> +})
> +
> +#define cdns_mhdp_mailbox_recv_header(_mhdp, _module_id, _opcode, _req_size) \
> +({ \
> + u32 mbox_size, i; \
> + u8 header[4]; \
> + int ret; \
> +\
> + do { \
> + /* read the header of the message */ \
> + for (i = 0; i < sizeof(header); i++) { \
> + ret = cdns_mhdp_mailbox_read(_mhdp); \
> + if (ret < 0) \
> + break; \
> +\
> + 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(_mhdp) < 0) \
> + break; \
> +\
> + ret = -EINVAL; \
> + } \
> +\
> + ret = 0; \
> +\
> + } while (0); \
> +\
> + ret; \
> +})
> +
> +#define cdns_mhdp_mailbox_recv_data(_mhdp, _buff, _buff_size) \
> +({ \
> + u32 i; \
> + int ret; \
> +\
> + do { \
> + for (i = 0; i < (_buff_size); i++) { \
> + ret = cdns_mhdp_mailbox_read(_mhdp); \
> + if (ret < 0) \
> + break; \
> +\
> + ((u8 *)_buff)[i] = ret; \
> + } \
> +\
> + ret = 0; \
> +\
> + } while (0); \
> +\
> + ret; \
> +})
> +
> +#define cdns_mhdp_mailbox_send(_mhdp, _module_id, _opcode, _size, _message) \
> +({ \
> + u8 header[4]; \
> + int ret, i; \
> +\
> + header[0] = _opcode; \
> + header[1] = _module_id; \
> + put_unaligned_be16(_size, header + 2); \
> +\
> + do { \
> + for (i = 0; i < sizeof(header); i++) { \
> + ret = cdns_mhdp_mailbox_write(_mhdp, header[i]); \
> + if (ret < 0) \
> + break; \
> + } \
> +\
> + for (i = 0; i < _size; i++) { \
> + ret = cdns_mhdp_mailbox_write(_mhdp, ((u8 *)_message)[i]); \
> + if (ret < 0) \
> + break;; \
> + } \
> + ret = 0; \
> + } while (0); \
> +\
> + ret; \
> +})
> +
> +#define cdns_mhdp_reg_read(_mhdp, _addr, _value) \
> +({ \
> + u8 msg[4], resp[8]; \
> + int ret; \
> +\
> + put_unaligned_be32(_addr, msg); \
> +\
> + mutex_lock(&(_mhdp)->mbox_mutex); \
> +\
> + do { \
> + ret = cdns_mhdp_mailbox_send(_mhdp, MB_MODULE_ID_GENERAL, \
> + GENERAL_REGISTER_READ, \
> + sizeof(msg), msg); \
> + if (ret < 0) \
> + break; \
> +\
> + ret = cdns_mhdp_mailbox_recv_header(_mhdp, MB_MODULE_ID_GENERAL, \
> + GENERAL_REGISTER_READ, \
> + sizeof(resp)); \
> + if (ret < 0) \
> + break; \
> +\
> + ret = cdns_mhdp_mailbox_recv_data(_mhdp, resp, sizeof(resp)); \
> + if (ret < 0) \
> + break; \
> +\
> + /* Returned address value should be the same as requested */ \
> + if (memcmp(msg, resp, sizeof(msg))) { \
> + ret = -EINVAL; \
> + break; \
> + } \
> +\
> + *((u32 *)_value) = get_unaligned_be32(resp + 4); \
> + ret = 0; \
> + } while (0); \
> +\
> + mutex_unlock(&(_mhdp)->mbox_mutex); \
> + if (ret < 0) { \
> + dev_err((_mhdp)->dev, "Failed to read register\n"); \
> + *((u32 *)_value) = 0; \
> + } \
> +\
> + ret; \
> +})
> +
> +#define cdns_mhdp_reg_write(_mhdp, _addr, _val) \
> +({ \
> + u8 msg[8]; \
> + int ret; \
> +\
> + put_unaligned_be32(_addr, msg); \
> + put_unaligned_be32(_val, msg + 4); \
> +\
> + mutex_lock(&(_mhdp)->mbox_mutex); \
> +\
> + ret = cdns_mhdp_mailbox_send(_mhdp, MB_MODULE_ID_GENERAL, \
> + GENERAL_REGISTER_WRITE, sizeof(msg), msg); \
> +\
> + mutex_unlock(&(_mhdp)->mbox_mutex); \
> +\
> + ret; \
> +})
> +
> +#define cdns_mhdp_reg_write_bit(_mhdp, _addr, _start_bit, _bits_no, _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(&(_mhdp)->mbox_mutex); \
> +\
> + ret = cdns_mhdp_mailbox_send((_mhdp), MB_MODULE_ID_DP_TX, \
> + DPTX_WRITE_FIELD, sizeof(field), field); \
> +\
> + mutex_unlock(&(_mhdp)->mbox_mutex); \
> +\
> + ret; \
> +})
> +
> +#endif
--
With best wishes
Dmitry
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