x86: Make sure that the LPC is active before SDRAM init

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@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>

diff --git a/arch/x86/lib/spl.c b/arch/x86/lib/spl.c
index ba3434b055c3f708d07f7f8fb1c696a4d5915fa0..b6812bb8ca2b365b57b5a8ec1e654ebce701e6e0 100644 (file)
--- 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@chromium.org): We use this area of RAM for the stack
@@ -114,6 +116,13 @@ 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);