[PATCH v4 39/45] x86: Make sure that the LPC is active before SDRAM init

[Simon Glass]

Some boards need to access GPIOs to determine which SDRAM is fitted to the
board, for example chromebook_link. Probe this device (if it exists) to
make sure that this works as expected.

Signed-off-by: Simon Glass <sjg at chromium.org>
---

(no changes since v2)

Changes in v2:
- Add new patch to make sure that the LPC is active before SDRAM init

 arch/x86/lib/spl.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/arch/x86/lib/spl.c b/arch/x86/lib/spl.c
index 6886587f647f..fb7dac68d7aa 100644
--- a/arch/x86/lib/spl.c
+++ b/arch/x86/lib/spl.c
@@ -65,6 +65,8 @@ static int set_max_freq(void)
 
 static int x86_spl_init(void)
 {
+	struct udevice *dev;
+
 #ifndef CONFIG_TPL
 	/*
 	 * TODO(sjg at chromium.org): We use this area of RAM for the stack
@@ -109,6 +111,13 @@ static int x86_spl_init(void)
 		return ret;
 	}
 #endif
+	/* probe the LPC so we get the GPIO_BASE set up correctly */
+	ret = uclass_first_device_err(UCLASS_LPC, &dev);
+	if (ret && ret != -ENODEV) {
+		log_debug("lpc probe failed\n");
+		return ret;
+	}
+
 	ret = dram_init();
 	if (ret) {
 		log_debug("dram_init() failed (err=%d)\n", ret);
-- 
2.41.0.162.gfafddb0af9-goog