[PATCH 2/2] drm/amdgpu: Retry i2c transfer once if it fails

[Kent Russell]

During init, there can be some collisions on the i2c bus that result in
the EEPROM read failing. This has been mitigated in the PMFW to a
degree, but there is still a small chance that the bus will be busy.
When the read fails during RAS init, that disables page retirement
altogether, which is obviously not ideal. To try to avoid that
situation, set the eeprom_read function to retry once if the first read
fails.

Signed-off-by: Kent Russell <kent.russell at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_eeprom.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_eeprom.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_eeprom.c
index 35fee3e8cde2..32755a37dcef 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_eeprom.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_eeprom.c
@@ -227,8 +227,14 @@ int amdgpu_eeprom_read(struct i2c_adapter *i2c_adap,
 		       u32 eeprom_addr, u8 *eeprom_buf,
 		       u32 bytes)
 {
-	return amdgpu_eeprom_xfer(i2c_adap, eeprom_addr, eeprom_buf, bytes,
+	int ret;
+
+	ret = amdgpu_eeprom_xfer(i2c_adap, eeprom_addr, eeprom_buf, bytes,
+				  true);
+	if (ret)
+		ret = amdgpu_eeprom_xfer(i2c_adap, eeprom_addr, eeprom_buf, bytes,
 				  true);
+	return ret;
 }
 
 int amdgpu_eeprom_write(struct i2c_adapter *i2c_adap,
-- 
2.34.1