--flash_gpu_descriptor: Keep bay power if already on

84ffa84 made sure to turn on and off
the bay power to enable programming the EEPROM even with bad eeprom
(which would cause EC not to turn on bay power).

But this would cause issue for reprogramming a good eeprom because the
power is already on and it would turn it off afterwards.

So if the bay power if turned off for a GPU when windows with nvidia
driver is running, the driver crashes and bluescreens Windows.

Signed-off-by: Daniel Schaefer <dhs@frame.work>

Author: JohnAZoidberg

framework_lib/src/chromium_ec/mod.rs

@@ -1354,15 +1354,18 @@ impl CrosEc {
         }
 
         if let Ok(ExpansionBayBoard::DualInterposer) = info.expansion_bay_board() {
-            /* Force power to the GPU if we are writing the EEPROM */
-            let res = self.set_gpio("gpu_3v_5v_en", true);
-            if let Err(err) = res {
-                error!("Failed to set ALW power to GPU off {:?}", err);
-                return Err(err);
+            // If bay power is on already, we don't need to enable/disable it
+            if !self.get_gpio("gpu_3v_5v_en")? {
+                // Force power to the GPU if we are writing the EEPROM
+                let res = self.set_gpio("gpu_3v_5v_en", true);
+                if let Err(err) = res {
+                    error!("Failed to set ALW power to GPU off {:?}", err);
+                    return Err(err);
+                }
+                println!("Forcing Power to GPU");
+                os_specific::sleep(100_000);
+                force_power = true;
             }
-            println!("Forcing Power to GPU");
-            os_specific::sleep(100_000);
-            force_power = true;
         }
 
         // Need to program the EEPROM 32 bytes at a time.