[PATCH v7 2/4] uclass: cpu: fix to display proper CPU features

[Sagar Shrikant Kadam]

The cmd "cpu detail" fetches uninitialized cpu feature information
and thus displays wrong / inconsitent details as below.
For eg: FU540-C000 doesn't have any microcode, yet the cmd display's it.

=> cpu detail
  1: cpu at 1      rv64imafdc
        ID = 1, freq = 999.100 MHz: L1 cache, MMU, Microcode, Device ID
        Microcode version 0x0
        Device ID 0x0
  2: cpu at 2      rv64imafdc
        ID = 2, freq = 999.100 MHz: L1 cache, MMU, Microcode, Device ID
        Microcode version 0x0
        Device ID 0x0
  3: cpu at 3      rv64imafdc
        ID = 3, freq = 999.100 MHz: L1 cache, MMU, Microcode, Device ID
        Microcode version 0x0
        Device ID 0x0
  4: cpu at 4      rv64imafdc
        ID = 4, freq = 999.100 MHz: L1 cache, MMU, Microcode, Device ID
        Microcode version 0x0
        Device ID 0x0

The L1 cache or MMU entry seen above is also displayed inconsistently.
So initialize cpu information to zero into cpu-uclass itself so that
similar issues can be avoided for other CPU drivers.

We now see correct features as:
=> cpu detail
  1: cpu at 1      rv64imafdc
        ID = 1, freq = 999.100 MHz
  2: cpu at 2      rv64imafdc
        ID = 2, freq = 999.100 MHz
  3: cpu at 3      rv64imafdc
        ID = 3, freq = 999.100 MHz
  4: cpu at 4      rv64imafdc
        ID = 4, freq = 999.100 MHz

Signed-off-by: Sagar Shrikant Kadam <sagar.kadam at sifive.com>
Reviewed-by: Pragnesh Patel <pragnesh.patel at sifive.com>
Reviewed-by: Bin Meng <bin.meng at windriver.com>
---
 drivers/cpu/cpu-uclass.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/cpu/cpu-uclass.c b/drivers/cpu/cpu-uclass.c
index 7418c26..cbb4419 100644
--- a/drivers/cpu/cpu-uclass.c
+++ b/drivers/cpu/cpu-uclass.c
@@ -86,6 +86,9 @@ int cpu_get_info(struct udevice *dev, struct cpu_info *info)
 	if (!ops->get_info)
 		return -ENOSYS;
 
+	/* Init cpu_info to 0 */
+	memset(info, 0, sizeof(struct cpu_info));
+
 	return ops->get_info(dev, info);
 }
 
-- 
2.7.4