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slimport: anx7808: Improve the cable detection

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The device might fall in abnormal state in slimport with power on.
The slimport couldn't detect the cable correctly at that time.
We make a sure that the slimport is in power off before turning it on
to avoid that issue.

Change-Id: I119f17e3767221582d1d4330fdfa913552b84503
This commit is contained in:
Devin Kim 2013-02-04 15:40:12 -08:00 committed by Iliyan Malchev
parent 11f42acd0f
commit e29e266b40
1 changed files with 25 additions and 23 deletions
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48
drivers/misc/slimport_anx7808/slimport.c
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@ -119,11 +119,32 @@ int slimport_read_edid_block(int block, uint8_t *edid_buf)
}
EXPORT_SYMBOL(slimport_read_edid_block);
static void sp_tx_power_down_and_init(void)
{
sp_tx_vbus_powerdown();
sp_tx_power_down(SP_TX_PWR_REG);
sp_tx_power_down(SP_TX_PWR_TOTAL);
sp_tx_hardware_powerdown();
sp_tx_pd_mode = 1;
sp_tx_link_config_done = 0;
sp_tx_hw_lt_enable = 0;
sp_tx_hw_lt_done = 0;
sp_tx_rx_type = RX_NULL;
sp_tx_rx_type_backup = RX_NULL;
sp_tx_set_sys_state(STATE_CABLE_PLUG);
}
static void slimport_cable_plug_proc(struct anx7808_data *anx7808)
{
struct anx7808_platform_data *pdata = anx7808->pdata;
if (gpio_get_value_cansleep(pdata->gpio_cbl_det)) {
/* Previously, if sp tx is turned on, turn it off to
* avoid the cable detection erorr.
*/
if (!sp_tx_pd_mode)
sp_tx_power_down_and_init();
/* debounce time for avoiding glitch */
msleep(50);
if (gpio_get_value_cansleep(pdata->gpio_cbl_det)) {
if (sp_tx_pd_mode) {
@ -137,17 +158,7 @@ static void slimport_cable_plug_proc(struct anx7808_data *anx7808)
msleep(200);
if (!sp_tx_get_cable_type()) {
pr_err("%s:AUX ERR\n", __func__);
sp_tx_vbus_powerdown();
sp_tx_power_down(SP_TX_PWR_REG);
sp_tx_power_down(SP_TX_PWR_TOTAL);
sp_tx_hardware_powerdown();
sp_tx_pd_mode = 1;
sp_tx_link_config_done = 0;
sp_tx_hw_lt_enable = 0;
sp_tx_hw_lt_done = 0;
sp_tx_rx_type = RX_NULL;
sp_tx_rx_type_backup = RX_NULL;
sp_tx_set_sys_state(STATE_CABLE_PLUG);
sp_tx_power_down_and_init();
return;
}
sp_tx_rx_type_backup = sp_tx_rx_type;
@ -172,18 +183,9 @@ static void slimport_cable_plug_proc(struct anx7808_data *anx7808)
break;
}
}
} else if (sp_tx_pd_mode == 0) {
sp_tx_vbus_powerdown();
sp_tx_power_down(SP_TX_PWR_REG);
sp_tx_power_down(SP_TX_PWR_TOTAL);
sp_tx_hardware_powerdown();
sp_tx_pd_mode = 1;
sp_tx_link_config_done = 0;
sp_tx_hw_lt_enable = 0;
sp_tx_hw_lt_done = 0;
sp_tx_rx_type = RX_NULL;
sp_tx_rx_type_backup = RX_NULL;
sp_tx_set_sys_state(STATE_CABLE_PLUG);
} else { /* dettach cable */
if (sp_tx_pd_mode == 0)
sp_tx_power_down_and_init();
}
}