GNUBoot
/
coreboot-kgpe-d16
2
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

rockchip/rk3399: mipi: properly configure PHY timing 

These values are specified as constant time periods but the PHY
configuration is in terms of the current lane byte clock so using
constant values guarantees that the timings will be outside the
specification with some display configurations.

Derive the necessary configuration from the byte clock in order to
ensure that the PHY configuration is correct.

Change-Id: I396029956730907a33babe39c6a171f2fcea9dcd
Signed-off-by: Lin Huang <hl@rock-chips.com>
Reviewed-on: https://review.coreboot.org/22470
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Brian Norris <briannorris@chromium.org>
Reviewed-by: Matthias Kaehlcke <mka@chromium.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>
This commit is contained in:
Lin Huang 2017-11-02 17:53:30 +08:00 committed by Julius Werner
parent 538b9ef66f
commit 45f1b01324
2 changed files with 88 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
src/soc/rockchip/rk3399/include/soc/mipi.h
View File

@ -243,6 +243,17 @@ check_member(rk_mipi_regs, dsi_int_msk1, 0xc8);
#define TERMINATION_RESISTER_CONTROL 0x21
#define AFE_BIAS_BANDGAP_ANALOG_PROGRAMMABILITY 0x22
#define HS_RX_CONTROL_OF_LANE_0 0x44
#define HS_TX_CLOCK_LANE_REQUEST_STATE_TIME_CONTROL 0x60
#define HS_TX_CLOCK_LANE_PREPARE_STATE_TIME_CONTROL 0x61
#define HS_TX_CLOCK_LANE_HS_ZERO_STATE_TIME_CONTROL 0x62
#define HS_TX_CLOCK_LANE_TRAIL_STATE_TIME_CONTROL 0x63
#define HS_TX_CLOCK_LANE_EXIT_STATE_TIME_CONTROL 0x64
#define HS_TX_CLOCK_LANE_POST_TIME_CONTROL 0x65
#define HS_TX_DATA_LANE_REQUEST_STATE_TIME_CONTROL 0x70
#define HS_TX_DATA_LANE_PREPARE_STATE_TIME_CONTROL 0x71
#define HS_TX_DATA_LANE_HS_ZERO_STATE_TIME_CONTROL 0x72
#define HS_TX_DATA_LANE_TRAIL_STATE_TIME_CONTROL 0x73
#define HS_TX_DATA_LANE_EXIT_STATE_TIME_CONTROL 0x74
#define GEN_CMD_EMPTY BIT(0)
#define GEN_CMD_FULL BIT(1)

67
src/soc/rockchip/rk3399/mipi.c
View File

@ -123,10 +123,38 @@ static void rk_mipi_dsi_phy_write(struct rk_mipi_dsi *dsi,
write32(&mipi_regs->dsi_phy_tst_ctrl0, PHY_TESTCLK | PHY_UNTESTCLR);
}
/* bytes_per_ns - Nanoseconds to byte clock cycles */
static inline unsigned int bytes_per_ns(struct rk_mipi_dsi *dsi, int ns)
{
return DIV_ROUND_UP((u64)ns * dsi->lane_bps, (u64)8 * NSECS_PER_SEC);
}
/* bits_per_ns - Nanoseconds to bit time periods */
static inline unsigned int bits_per_ns(struct rk_mipi_dsi *dsi, int ns)
{
return DIV_ROUND_UP((u64)ns * dsi->lane_bps, NSECS_PER_SEC);
}
static int rk_mipi_dsi_wait_phy_lock(struct rk_mipi_dsi *dsi)
{
struct stopwatch sw;
int val;
stopwatch_init_msecs_expire(&sw, 20);
do {
val = read32(&mipi_regs->dsi_phy_status);
if (val & LOCK)
return 0;
} while (!stopwatch_expired(&sw));
return -1;
}
static int rk_mipi_dsi_phy_init(struct rk_mipi_dsi *dsi)
{
int i, vco;
int i, vco, val;
int lane_mbps = div_round_up(dsi->lane_bps, USECS_PER_SEC);
struct stopwatch sw;
vco = (lane_mbps < 200) ? 0 : (lane_mbps + 100) / 200;
@ -192,10 +220,47 @@ static int rk_mipi_dsi_phy_init(struct rk_mipi_dsi *dsi)
TER_RESISTOR_HIGH | LEVEL_SHIFTERS_ON |
SETRD_MAX | POWER_MANAGE |
TER_RESISTORS_ON);
rk_mipi_dsi_phy_write(dsi, HS_TX_CLOCK_LANE_REQUEST_STATE_TIME_CONTROL,
TLP_PROGRAM_EN | bytes_per_ns(dsi, 500));
rk_mipi_dsi_phy_write(dsi, HS_TX_CLOCK_LANE_PREPARE_STATE_TIME_CONTROL,
THS_PRE_PROGRAM_EN | bits_per_ns(dsi, 40));
rk_mipi_dsi_phy_write(dsi, HS_TX_CLOCK_LANE_HS_ZERO_STATE_TIME_CONTROL,
THS_ZERO_PROGRAM_EN | bytes_per_ns(dsi, 300));
rk_mipi_dsi_phy_write(dsi, HS_TX_CLOCK_LANE_TRAIL_STATE_TIME_CONTROL,
THS_PRE_PROGRAM_EN | bits_per_ns(dsi, 100));
rk_mipi_dsi_phy_write(dsi, HS_TX_CLOCK_LANE_EXIT_STATE_TIME_CONTROL,
BIT(5) | bytes_per_ns(dsi, 100));
rk_mipi_dsi_phy_write(dsi, HS_TX_CLOCK_LANE_POST_TIME_CONTROL,
BIT(5) | (bytes_per_ns(dsi, 60) + 7));
rk_mipi_dsi_phy_write(dsi, HS_TX_DATA_LANE_REQUEST_STATE_TIME_CONTROL,
TLP_PROGRAM_EN | bytes_per_ns(dsi, 500));
rk_mipi_dsi_phy_write(dsi, HS_TX_DATA_LANE_PREPARE_STATE_TIME_CONTROL,
THS_PRE_PROGRAM_EN | (bits_per_ns(dsi, 50) + 5));
rk_mipi_dsi_phy_write(dsi, HS_TX_DATA_LANE_HS_ZERO_STATE_TIME_CONTROL,
THS_ZERO_PROGRAM_EN |
(bytes_per_ns(dsi, 140) + 2));
rk_mipi_dsi_phy_write(dsi, HS_TX_DATA_LANE_TRAIL_STATE_TIME_CONTROL,
THS_PRE_PROGRAM_EN | (bits_per_ns(dsi, 60) + 8));
rk_mipi_dsi_phy_write(dsi, HS_TX_DATA_LANE_EXIT_STATE_TIME_CONTROL,
BIT(5) | bytes_per_ns(dsi, 100));
write32(&mipi_regs->dsi_phy_rstz, PHY_ENFORCEPLL | PHY_ENABLECLK |
PHY_UNRSTZ | PHY_UNSHUTDOWNZ);
if (rk_mipi_dsi_wait_phy_lock(dsi)) {
printk(BIOS_ERR, "failed to wait for phy lock state\n");
return -1;
}
stopwatch_init_msecs_expire(&sw, 20);
do {
val = read32(&mipi_regs->dsi_phy_status);
if (val & STOP_STATE_CLK_LANE)
return 0;
} while (!stopwatch_expired(&sw));
printk(BIOS_ERR, "failed to wait for phy clk lane stop state");
return -1;
}
static inline int mipi_dsi_pixel_format_to_bpp(enum mipi_dsi_pixel_format fmt)