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mb/google/rex/var/rex0: Refactor SSD power sequencing

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Improve SSD readiness time by enabling earlier power sequencing.

Here are the two GPIOs to look for:
* GPP_A19: Power Enable
* GPP_A20: PERST

The flow is presented as `stage (GPIO PAD/Value)` for easy
understanding:

bootblock (A20/0, A19/1)
|
v
romstage (A20/1)

Ideally, we don't need SSD power sequencing at ramstage, hence, remove
the logic from ramstage.

TEST=Able to build and boot google/rex0 using NVMe without any problems.
S0ix and read/write from/to SSD are also normal.

Change-Id: Idde2f7693771f1d7e3171e51232d1bb899bfe33e
Signed-off-by: Subrata Banik <subratabanik@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/80641
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Kapil Porwal <kapilporwal@google.com>
This commit is contained in:
Subrata Banik
2024-02-20 20:15:20 +05:30
parent f0277dbbe6
commit 4bbace87aa
1 changed files with 6 additions and 12 deletions
Download Patch File Download Diff File Expand all files Collapse all files

18
src/mainboard/google/rex/variants/rex0/gpio.c
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@@ -46,10 +46,6 @@ static const struct pad_config gpio_table[] = {
/* GPP_A18 : [] ==> CAM_PSW_L */
PAD_CFG_GPI_INT_LOCK(GPP_A18, NONE, EDGE_BOTH, LOCK_CONFIG),
/* GPP_A19 : [] ==> EN_PP3300_SSD */
PAD_CFG_GPO(GPP_A19, 1, DEEP),
/* GPP_A20 : [] ==> SSD_PERST_L */
PAD_CFG_GPO_LOCK(GPP_A20, 1, LOCK_CONFIG),
/* GPP_A21 : [] ==> WWAN_CONFIG2 */
PAD_CFG_GPI(GPP_A21, NONE, DEEP),
@@ -376,10 +372,8 @@ static const struct pad_config gpio_table[] = {
/* Early pad configuration in bootblock */
static const struct pad_config early_gpio_table[] = {
/* GPP_A19 : [] ==> EN_PP3300_SSD */
PAD_CFG_GPO(GPP_A19, 0, DEEP),
/* GPP_A20 : [] ==> SSD_PERST_L */
PAD_CFG_GPO(GPP_A20, 1, DEEP),
PAD_CFG_GPO(GPP_A20, 0, DEEP),
/* GPP_B16 : [] ==> SOC_HDMI_HPD_L */
PAD_CFG_NF(GPP_B16, NONE, DEEP, NF2),
@@ -417,22 +411,22 @@ static const struct pad_config early_gpio_table[] = {
/* GPP_H10 : [] ==> SOC_WP_OD */
PAD_CFG_GPI_GPIO_DRIVER_LOCK(GPP_H10, NONE, LOCK_CONFIG),
/* GPP_A19 : [] ==> EN_PP3300_SSD */
PAD_CFG_GPO(GPP_A19, 1, DEEP),
};
static const struct pad_config romstage_gpio_table[] = {
/* GPP_A19 : [] ==> EN_PP3300_SSD */
PAD_CFG_GPO(GPP_A19, 1, DEEP),
/* GPP_B11 : [] ==> EN_FP_PWR */
PAD_CFG_GPO(GPP_B11, 0, DEEP),
/* A20 : [] ==> SSD_PERST_L */
PAD_CFG_GPO(GPP_A20, 0, DEEP),
/* GPP_C23 : [] ==> FP_RST_ODL */
PAD_CFG_GPO(GPP_C23, 0, DEEP),
/* GPP_E07 : [] ==> WWAN_FCPO_L */
PAD_CFG_GPO(GPP_E07, 1, DEEP),
/* GPP_D02 : [] ==> SD_PERST_L */
PAD_CFG_GPO(GPP_D02, 1, DEEP),
/* GPP_A20 : [] ==> SSD_PERST_L */
PAD_CFG_GPO(GPP_A20, 1, DEEP),
};
const struct pad_config *variant_gpio_table(size_t *num)