x86: broadwell: Improve SDRAM debugging output

Add debugging during SDRAM init so that problems are easier to
diagnose.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>

diff --git a/arch/x86/cpu/broadwell/sdram.c b/arch/x86/cpu/broadwell/sdram.c
index 03a35bcf73f111a1847341279e4062af5683dfcf..1b9f9840c6f8a271b612cf34b80edf60b0d95ee8 100644 (file)
--- a/arch/x86/cpu/broadwell/sdram.c
+++ b/arch/x86/cpu/broadwell/sdram.c
@@ -204,16 +204,18 @@ int dram_init(void)
 
        /* Print ME state before MRC */
        ret = syscon_get_by_driver_data(X86_SYSCON_ME, &me_dev);
-       if (ret)
+       if (ret) {
+               debug("Cannot get ME (err=%d)\n", ret);
                return ret;
+       }
        intel_me_status(me_dev);
 
        /* Save ME HSIO version */
-       ret = uclass_first_device(UCLASS_PCH, &pch_dev);
-       if (ret)
+       ret = uclass_first_device_err(UCLASS_PCH, &pch_dev);
+       if (ret) {
+               debug("Cannot get PCH (err=%d)\n", ret);
                return ret;
-       if (!pch_dev)
-               return -ENODEV;
+       }
        power_state_get(pch_dev, &ps);
 
        intel_me_hsio_version(me_dev, &ps.hsio_version, &ps.hsio_checksum);
@@ -221,15 +223,17 @@ int dram_init(void)
        broadwell_fill_pei_data(pei_data);
        mainboard_fill_pei_data(pei_data);
 
-       ret = uclass_first_device(UCLASS_NORTHBRIDGE, &dev);
-       if (ret)
+       ret = uclass_first_device_err(UCLASS_NORTHBRIDGE, &dev);
+       if (ret) {
+               debug("Cannot get Northbridge (err=%d)\n", ret);
                return ret;
-       if (!dev)
-               return -ENODEV;
+       }
        size = 256;
        ret = mrc_locate_spd(dev, size, &spd_data);
-       if (ret)
+       if (ret) {
+               debug("Cannot locate SPD (err=%d)\n", ret);
                return ret;
+       }
        memcpy(pei_data->spd_data[0][0], spd_data, size);
        memcpy(pei_data->spd_data[1][0], spd_data, size);
 
@@ -239,13 +243,17 @@ int dram_init(void)
 
        debug("PEI version %#x\n", pei_data->pei_version);
        ret = mrc_common_init(dev, pei_data, true);
-       if (ret)
+       if (ret) {
+               debug("mrc_common_init() failed(err=%d)\n", ret);
                return ret;
+       }
        debug("Memory init done\n");
 
        ret = sdram_find(dev);
-       if (ret)
+       if (ret) {
+               debug("sdram_find() failed (err=%d)\n", ret);
                return ret;
+       }
        gd->ram_size = gd->arch.meminfo.total_32bit_memory;
        debug("RAM size %llx\n", (unsigned long long)gd->ram_size);