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soc/mediatek/mt8186: set pin drive strength to 8mA for NOR 

Set NOR pin drive to 8mA to comply with HW requirement.

This implementation is according to chapter 5.1, 5.6 and 5.8 in MT8186
Functional Specification.

BUG=b:218775654, b:216462313, b:212375511
TEST=SPI SI tests for AP to NOR pass for both kingler and krabby.

Signed-off-by: Rex-BC Chen <rex-bc.chen@mediatek.com>
Change-Id: I5b6e37b0f7d4207ea35f11394d25ad1e096ac01a
Reviewed-on: https://review.coreboot.org/c/coreboot/+/62472
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Yu-Ping Wu <yupingso@google.com>
This commit is contained in:
Rex-BC Chen 2022-02-21 20:01:45 +08:00 committed by Felix Held
parent ada2a63dab
commit cb783c87d2
1 changed files with 9 additions and 0 deletions
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9
src/soc/mediatek/mt8186/spi.c
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@ -6,6 +6,7 @@
*/
#include <assert.h>
#include <console/console.h>
#include <device/mmio.h>
#include <spi_flash.h>
#include <soc/addressmap.h>
@ -147,6 +148,14 @@ void mtk_snfc_init(int gpio_set)
for (size_t i = 0; i < ARRAY_SIZE(nor_pinmux[gpio_set]); i++) {
gpio_set_pull(ptr[i].gpio, GPIO_PULL_ENABLE, ptr[i].select);
gpio_set_mode(ptr[i].gpio, ptr[i].func);
if (gpio_set_driving(ptr[i].gpio, GPIO_DRV_8_MA) < 0)
printk(BIOS_WARNING,
"%s: failed to set pin drive to 8 mA for %d\n",
__func__, ptr[i].gpio.id);
else
printk(BIOS_DEBUG, "%s: got pin drive: %#x\n", __func__,
gpio_get_driving(ptr[i].gpio));
}
}