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drm/bridge: max96745: Add tx_rate switch for twisted-pair cable

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Signed-off-by: Wyon Bi <bivvy.bi@rock-chips.com>
Change-Id: I02af1ca0325a0eeb41023f56d7d747da17afab99
This commit is contained in:
Wyon Bi 2023-05-19 22:42:52 +08:00 • committed by Tao Huang
commit b65cee7aa1
3 changed files with 43 additions and 2 deletions
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38
drivers/gpu/drm/bridge/maxim-max96745.c
View file

@ -88,6 +88,23 @@ static void max96745_bridge_enable(struct drm_bridge *bridge)
{
struct max96745_bridge *ser = to_max96745_bridge(bridge);
struct max96745 *max96745 = ser->parent;
struct drm_display_mode *mode = &bridge->encoder->crtc->state->adjusted_mode;
u8 cxtp, tx_rate;
u32 reg;
regmap_read(ser->regmap, 0x0011, &reg);
cxtp = FIELD_GET(CXTP_A, reg);
regmap_read(ser->regmap, 0x0028, &reg);
tx_rate = FIELD_GET(TX_RATE, reg);
if (!cxtp && mode->clock > 95000 && tx_rate == 1) {
regmap_update_bits(ser->regmap, 0x0028, TX_RATE,
FIELD_PREP(TX_RATE, 2));
regmap_update_bits(ser->regmap, 0x0029, RESET_ONESHOT,
FIELD_PREP(RESET_ONESHOT, 1));
if (regmap_read_poll_timeout(ser->regmap, 0x002a, reg,
reg & LINK_LOCKED, 10000, 200000))
dev_err(ser->dev, "%s: GMSL link not locked\n", __func__);
}
if (ser->panel)
drm_panel_enable(ser->panel);
@ -109,9 +126,30 @@ static void max96745_bridge_disable(struct drm_bridge *bridge)
static void max96745_bridge_post_disable(struct drm_bridge *bridge)
{
struct max96745_bridge *ser = to_max96745_bridge(bridge);
u8 cxtp, tx_rate, link_locked;
u32 reg;
regmap_read(ser->regmap, 0x002a, &reg);
link_locked = FIELD_GET(LINK_LOCKED, reg);
if (ser->panel)
drm_panel_unprepare(ser->panel);
regmap_read(ser->regmap, 0x0011, &reg);
cxtp = FIELD_GET(CXTP_A, reg);
regmap_read(ser->regmap, 0x0028, &reg);
tx_rate = FIELD_GET(TX_RATE, reg);
if (!cxtp && tx_rate == 2) {
regmap_update_bits(ser->regmap, 0x0028, TX_RATE,
FIELD_PREP(TX_RATE, 1));
regmap_update_bits(ser->regmap, 0x0029, RESET_ONESHOT,
FIELD_PREP(RESET_ONESHOT, 1));
if (link_locked) {
if (regmap_read_poll_timeout(ser->regmap, 0x002a, reg,
reg & LINK_LOCKED, 10000, 200000))
dev_err(ser->dev, "%s: GMSL link not locked\n", __func__);
}
}
}
static enum drm_connector_status

2
drivers/mfd/max96745.c
View file

@ -46,8 +46,6 @@ static bool max96745_vid_tx_active(struct max96745 *max96745)
static bool max96745_volatile_reg(struct device *dev, unsigned int reg)
{
switch (reg) {
case 0x0028 ... 0x0029:
case 0x0032 ... 0x0033:
case 0x0076:
case 0x0086:
case 0x0100:

5
include/linux/mfd/max96745.h
View file

@ -35,6 +35,10 @@ struct max96745 {
#define RESET_ALL BIT(7)
#define SLEEP BIT(3)
/* 0011h */
#define CXTP_B BIT(2)
#define CXTP_A BIT(0)
/* 0013h */
#define LOCKED BIT(3)
#define ERROR BIT(2)
@ -49,6 +53,7 @@ struct max96745 {
/* 0028h, 0032h */
#define LINK_EN BIT(7)
#define TX_RATE GENMASK(3, 2)
/* 0029h, 0033h */
#define RESET_LINK BIT(0)