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board: stm32mp1: Update power supply check via USB TYPE-C 

Add 2 new checks:
 - detect when USB TYPE-C cable is not plugged correctly.
   In this case, GND and VBUS pins are connected but not CC1
   and CC2 pins.

 - detect is an USB Type-C charger supplies more than 3 Amps
   which is not compliant with the USB Type-C specification

In these 2 situations, stop the boot process and let red led
blinks forever.

   V cc1      |   V cc2     | power supply | red led | console message
range (Volts) |range (Volts)|   (Amps)     | blinks  |
--------------|-------------|--------------|---------|-----------------------------------
    > 2.15    |   < 0.2     |     > 3      | for ever| USB TYPE-C charger not compliant with specification
[2.15 - 1.23[ |   < 0.2     |     3        |   NO    | NO
[1.23 - 0.66[ |   < 0.2     |     1.5      | 3 times | WARNING 1.5A power supply detected
[0.66 - 0]    |   < 0.2     |     0.5      | 2 times | WARNING 500mA power supply detected
    < 0.2     |   < 0.2     |              | for ever| ERROR USB TYPE-C connection in unattached mode
    > 0.2     |   > 0.2     |              | for ever| ERROR USB TYPE-C connection in unattached mode

Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
This commit is contained in:
Patrice Chotard 2019-04-30 18:09:38 +02:00
parent ca9c5dccb7
commit 28c064e66b
1 changed files with 56 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

69
board/st/stm32mp1/stm32mp1.c
View File

@ -62,9 +62,10 @@
*/
DECLARE_GLOBAL_DATA_PTR;
#define USB_LOW_THRESHOLD_UV 200000
#define USB_WARNING_LOW_THRESHOLD_UV 660000
#define USB_START_LOW_THRESHOLD_UV 1230000
#define USB_START_HIGH_THRESHOLD_UV 2100000
#define USB_START_HIGH_THRESHOLD_UV 2150000
int checkboard(void)
{
@ -265,9 +266,10 @@ static int board_check_usb_power(void)
ofnode node;
unsigned int raw;
int max_uV = 0;
int min_uV = USB_START_HIGH_THRESHOLD_UV;
int ret, uV, adc_count;
u8 i, nb_blink;
u32 nb_blink;
u8 i;
node = ofnode_path("/config");
if (!ofnode_valid(node)) {
debug("%s: no /config node?\n", __func__);
@ -319,6 +321,8 @@ static int board_check_usb_power(void)
if (!adc_raw_to_uV(adc, raw, &uV)) {
if (uV > max_uV)
max_uV = uV;
if (uV < min_uV)
min_uV = uV;
pr_debug("%s: %s[%02d] = %u, %d uV\n", __func__,
adc->name, adc_args.args[0], raw, uV);
} else {
@ -333,27 +337,66 @@ static int board_check_usb_power(void)
* continue.
*/
if (max_uV > USB_START_LOW_THRESHOLD_UV &&
max_uV < USB_START_HIGH_THRESHOLD_UV)
max_uV <= USB_START_HIGH_THRESHOLD_UV &&
min_uV <= USB_LOW_THRESHOLD_UV)
return 0;
/* Display warning message and make u-boot,error-led blinking */
pr_err("\n*******************************************\n");
pr_err("****************************************************\n");
if (max_uV < USB_WARNING_LOW_THRESHOLD_UV) {
pr_err("* WARNING 500mA power supply detected *\n");
/*
* If highest and lowest value are either both below
* USB_LOW_THRESHOLD_UV or both above USB_LOW_THRESHOLD_UV, that
* means USB TYPE-C is in unattached mode, this is an issue, make
* u-boot,error-led blinking and stop boot process.
*/
if ((max_uV > USB_LOW_THRESHOLD_UV &&
min_uV > USB_LOW_THRESHOLD_UV) ||
(max_uV <= USB_LOW_THRESHOLD_UV &&
min_uV <= USB_LOW_THRESHOLD_UV)) {
pr_err("* ERROR USB TYPE-C connection in unattached mode *\n");
pr_err("* Check that USB TYPE-C cable is correctly plugged *\n");
/* with 125ms interval, led will blink for 17.02 years ....*/
nb_blink = U32_MAX;
}
if (max_uV > USB_LOW_THRESHOLD_UV &&
max_uV <= USB_WARNING_LOW_THRESHOLD_UV &&
min_uV <= USB_LOW_THRESHOLD_UV) {
pr_err("* WARNING 500mA power supply detected *\n");
nb_blink = 2;
} else {
pr_err("* WARNING 1.5A power supply detected *\n");
}
if (max_uV > USB_WARNING_LOW_THRESHOLD_UV &&
max_uV <= USB_START_LOW_THRESHOLD_UV &&
min_uV <= USB_LOW_THRESHOLD_UV) {
pr_err("* WARNING 1.5mA power supply detected *\n");
nb_blink = 3;
}
pr_err("* Current too low, use a 3A power supply! *\n");
pr_err("*******************************************\n\n");
/*
* If highest value is above 2.15 Volts that means that the USB TypeC
* supplies more than 3 Amp, this is not compliant with TypeC specification
*/
if (max_uV > USB_START_HIGH_THRESHOLD_UV) {
pr_err("* USB TYPE-C charger not compliant with *\n");
pr_err("* specification *\n");
pr_err("****************************************************\n\n");
/* with 125ms interval, led will blink for 17.02 years ....*/
nb_blink = U32_MAX;
} else {
pr_err("* Current too low, use a 3A power supply! *\n");
pr_err("****************************************************\n\n");
}
ret = get_led(&led, "u-boot,error-led");
if (ret)
if (ret) {
/* in unattached case, the boot process must be stopped */
if (nb_blink == U32_MAX)
hang();
return ret;
}
/* make u-boot,error-led blinking */
for (i = 0; i < nb_blink * 2; i++) {
led_set_state(led, LEDST_TOGGLE);
mdelay(125);