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// SPDX-License-Identifier: GPL-2.0-or-later
#include <asm/unaligned.h>
#include <drm/bridge/cdns-mhdp.h>
#include <drm/drm_print.h>
#include <linux/io.h>
#define LINK_TRAINING_TIMEOUT_MS 500
#define LINK_TRAINING_RETRY_MS 20
static inline u32 get_unaligned_be24(const void *p)
{
const u8 *_p = p;
return _p[0] << 16 | _p[1] << 8 | _p[2];
}
static inline void put_unaligned_be24(u32 val, void *p)
{
u8 *_p = p;
_p[0] = val >> 16;
_p[1] = val >> 8;
_p[2] = val;
}
int cdns_mhdp_dpcd_read(struct cdns_mhdp_device *mhdp,
u32 addr, u8 *data, u16 len)
{
u8 msg[5], reg[5];
int ret;
put_unaligned_be16(len, msg);
put_unaligned_be24(addr, msg + 2);
ret = cdns_mhdp_mailbox_send(mhdp, MB_MODULE_ID_DP_TX,
DPTX_READ_DPCD, sizeof(msg), msg);
if (ret)
goto err_dpcd_read;
ret = cdns_mhdp_mailbox_validate_receive(mhdp, MB_MODULE_ID_DP_TX,
DPTX_READ_DPCD,
sizeof(reg) + len);
if (ret)
goto err_dpcd_read;
ret = cdns_mhdp_mailbox_read_receive(mhdp, reg, sizeof(reg));
if (ret)
goto err_dpcd_read;
ret = cdns_mhdp_mailbox_read_receive(mhdp, data, len);
err_dpcd_read:
return ret;
}
EXPORT_SYMBOL(cdns_mhdp_dpcd_read);
int cdns_mhdp_i2c_read(struct cdns_mhdp_device *mhdp, u8 addr, u8 *data,
u16 len, u8 mot, u16 *respLength)
{
u8 msg[5], reg[3];
int ret;
put_unaligned_be16(len, msg);
msg[2] = addr;
msg[3] = mot;
ret = cdns_mhdp_mailbox_send(mhdp, MB_MODULE_ID_DP_TX,
DPTX_I2C_READ, sizeof(msg), msg);
if (ret)
goto err_i2c_read;
ret = cdns_mhdp_mailbox_validate_receive(mhdp, MB_MODULE_ID_DP_TX,
DPTX_I2C_READ,
sizeof(reg) + len);
if (ret)
goto err_i2c_read;
ret = cdns_mhdp_mailbox_read_receive(mhdp, reg, sizeof(reg));
if (ret)
goto err_i2c_read;
ret = cdns_mhdp_mailbox_read_receive(mhdp, data, len);
*respLength = (reg[0] << 8u) + reg[1];
err_i2c_read:
if (ret)
DRM_DEV_ERROR(mhdp->dev, "i2c read failed: %d\n", ret);
return ret;
}
EXPORT_SYMBOL(cdns_mhdp_i2c_read);
int cdns_mhdp_dpcd_write(struct cdns_mhdp_device *mhdp, 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;
ret = cdns_mhdp_mailbox_send(mhdp, MB_MODULE_ID_DP_TX,
DPTX_WRITE_DPCD, sizeof(msg), msg);
if (ret)
goto err_dpcd_write;
ret = cdns_mhdp_mailbox_validate_receive(mhdp, MB_MODULE_ID_DP_TX,
DPTX_WRITE_DPCD, sizeof(reg));
if (ret)
goto err_dpcd_write;
ret = cdns_mhdp_mailbox_read_receive(mhdp, reg, sizeof(reg));
if (ret)
goto err_dpcd_write;
if (addr != get_unaligned_be24(reg + 2))
ret = -EINVAL;
err_dpcd_write:
if (ret)
DRM_DEV_ERROR(mhdp->dev, "dpcd write failed: %d\n", ret);
return ret;
}
EXPORT_SYMBOL(cdns_mhdp_dpcd_write);
int cdns_mhdp_i2c_write(struct cdns_mhdp_device *mhdp, u8 addr, u8 *value,
u8 mot, u16 len, u16 *respLength)
{
u8 msg[4+DP_AUX_MAX_PAYLOAD_BYTES], reg[3];
int ret;
put_unaligned_be16(len, msg);
msg[2] = addr;
msg[3] = mot;
memcpy(&msg[4], value, len);
ret = cdns_mhdp_mailbox_send(mhdp, MB_MODULE_ID_DP_TX,
DPTX_I2C_WRITE, sizeof(msg), msg);
if (ret)
goto err_i2c_write;
ret = cdns_mhdp_mailbox_validate_receive(mhdp, MB_MODULE_ID_DP_TX,
DPTX_I2C_WRITE, sizeof(reg));
if (ret)
goto err_i2c_write;
ret = cdns_mhdp_mailbox_read_receive(mhdp, reg, sizeof(reg));
if (ret)
goto err_i2c_write;
if (addr != reg[2])
ret = -EINVAL;
*respLength = (reg[0]<<8u) + reg[1];
err_i2c_write:
if (ret)
DRM_DEV_ERROR(mhdp->dev, "i2c write failed: %d\n", ret);
return ret;
}
EXPORT_SYMBOL(cdns_mhdp_i2c_write);
int cdns_mhdp_get_last_i2c_status(struct cdns_mhdp_device *mhdp, u8 *resp)
{
u8 status[1];
int ret;
ret = cdns_mhdp_mailbox_send(mhdp, MB_MODULE_ID_DP_TX,
DPTX_GET_LAST_I2C_STATUS, 0, NULL);
if (ret)
goto err_get_i2c_status;
ret = cdns_mhdp_mailbox_validate_receive(mhdp, MB_MODULE_ID_DP_TX,
DPTX_GET_LAST_I2C_STATUS,
sizeof(status));
if (ret)
goto err_get_i2c_status;
ret = cdns_mhdp_mailbox_read_receive(mhdp, status, sizeof(status));
if (ret)
goto err_get_i2c_status;
*resp = status[0];
err_get_i2c_status:
if (ret)
DRM_DEV_ERROR(mhdp->dev, "get i2c status failed: %d\n",
ret);
return ret;
}
EXPORT_SYMBOL(cdns_mhdp_get_last_i2c_status);
static int cdns_mhdp_training_start(struct cdns_mhdp_device *mhdp)
{
unsigned long timeout;
u8 msg, event[2];
int ret;
msg = LINK_TRAINING_RUN;
/* start training */
ret = cdns_mhdp_mailbox_send(mhdp, MB_MODULE_ID_DP_TX,
DPTX_TRAINING_CONTROL, sizeof(msg), &msg);
if (ret)
goto err_training_start;
timeout = jiffies + msecs_to_jiffies(LINK_TRAINING_TIMEOUT_MS);
while (time_before(jiffies, timeout)) {
msleep(LINK_TRAINING_RETRY_MS);
ret = cdns_mhdp_mailbox_send(mhdp, MB_MODULE_ID_DP_TX,
DPTX_READ_EVENT, 0, NULL);
if (ret)
goto err_training_start;
ret = cdns_mhdp_mailbox_validate_receive(mhdp,
MB_MODULE_ID_DP_TX,
DPTX_READ_EVENT,
sizeof(event));
if (ret)
goto err_training_start;
ret = cdns_mhdp_mailbox_read_receive(mhdp, event,
sizeof(event));
if (ret)
goto err_training_start;
if (event[1] & CLK_RECOVERY_FAILED)
DRM_DEV_ERROR(mhdp->dev, "clock recovery failed\n");
else if (event[1] & EQ_PHASE_FINISHED)
return 0;
}
ret = -ETIMEDOUT;
err_training_start:
DRM_DEV_ERROR(mhdp->dev, "training failed: %d\n", ret);
return ret;
}
static int cdns_mhdp_get_training_status(struct cdns_mhdp_device *mhdp)
{
u8 status[10];
int ret;
ret = cdns_mhdp_mailbox_send(mhdp, MB_MODULE_ID_DP_TX,
DPTX_READ_LINK_STAT, 0, NULL);
if (ret)
goto err_get_training_status;
ret = cdns_mhdp_mailbox_validate_receive(mhdp, MB_MODULE_ID_DP_TX,
DPTX_READ_LINK_STAT,
sizeof(status));
if (ret)
goto err_get_training_status;
ret = cdns_mhdp_mailbox_read_receive(mhdp, status, sizeof(status));
if (ret)
goto err_get_training_status;
mhdp->dp.rate = drm_dp_bw_code_to_link_rate(status[0]);
mhdp->dp.num_lanes = status[1];
err_get_training_status:
if (ret)
DRM_DEV_ERROR(mhdp->dev, "get training status failed: %d\n",
ret);
return ret;
}
int cdns_mhdp_train_link(struct cdns_mhdp_device *mhdp)
{
int ret;
ret = cdns_mhdp_training_start(mhdp);
if (ret) {
DRM_DEV_ERROR(mhdp->dev, "Failed to start training %d\n",
ret);
return ret;
}
ret = cdns_mhdp_get_training_status(mhdp);
if (ret) {
DRM_DEV_ERROR(mhdp->dev, "Failed to get training stat %d\n",
ret);
return ret;
}
DRM_DEV_DEBUG_KMS(mhdp->dev, "rate:0x%x, lanes:%d\n", mhdp->dp.rate,
mhdp->dp.num_lanes);
return ret;
}
EXPORT_SYMBOL(cdns_mhdp_train_link);
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