[S] Change in coreboot[master]: soc/mediatek/mt8188: Set pin drive strength to 8mA for NOR

[Rex-BC Chen (Code Review)]

Rex-BC Chen has submitted this change. ( https://review.coreboot.org/c/coreboot/+/74064 )

(

6 is the latest approved patch-set.
No files were changed between the latest approved patch-set and the submitted one.
 )Change subject: soc/mediatek/mt8188: Set pin drive strength to 8mA for NOR
......................................................................

soc/mediatek/mt8188: 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 5.8 and 5.19 in MT8188
Functional Specification.

BUG=b:270911452
TEST=boot with following logs
[DEBUG]  mtk_snfc_init: got pin drive: 0x3
[DEBUG]  mtk_snfc_init: got pin drive: 0x3
[DEBUG]  mtk_snfc_init: got pin drive: 0x3
[DEBUG]  mtk_snfc_init: got pin drive: 0x3

Change-Id: If8344449f5b34cefcaaee6936e94f7f669c7148b
Signed-off-by: Jason Chen 
Reviewed-on: https://review.coreboot.org/c/coreboot/+/74064
Reviewed-by: Rex-BC Chen 
Reviewed-by: Yidi Lin 
Reviewed-by: Yu-Ping Wu 
Tested-by: build bot (Jenkins) 
---
M src/soc/mediatek/mt8188/spi.c
1 file changed, 36 insertions(+), 0 deletions(-)

Approvals:
  build bot (Jenkins): Verified
  Yu-Ping Wu: Looks good to me, approved
  Yidi Lin: Looks good to me, but someone else must approve
  Rex-BC Chen: Looks good to me, but someone else must approve

diff --git a/src/soc/mediatek/mt8188/spi.c b/src/soc/mediatek/mt8188/spi.c
index 56efec5..0596bb9 100644
--- a/src/soc/mediatek/mt8188/spi.c
+++ b/src/soc/mediatek/mt8188/spi.c
@@ -6,6 +6,7 @@
  */

#include <assert.h>
+#include <console/console.h>
 #include <device/mmio.h>
 #include <gpio.h>
 #include <soc/addressmap.h>
@@ -105,6 +106,14 @@
    for (size_t i = 0; i < ARRAY_SIZE(nor_pinmux); 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_ERR,
+			       "%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));
    }
 }