efi_loader: Avoid overwriting previous outputs on console screen clearing

[platform/kernel/u-boot.git] / lib / efi_loader / efi_console.c

diff --git a/lib/efi_loader/efi_console.c b/lib/efi_loader/efi_console.c
index 9316995..1ed8c7a 100644 (file)
--- a/lib/efi_loader/efi_console.c
+++ b/lib/efi_loader/efi_console.c
@@ -461,10 +461,21 @@ static efi_status_t EFIAPI efi_cout_set_attribute(
 }
 
 /**
- * efi_cout_clear_screen() - clear screen
+ * efi_clear_screen() - clear screen
  */
 static void efi_clear_screen(void)
 {
+       if (CONFIG_IS_ENABLED(EFI_SCROLL_ON_CLEAR_SCREEN)) {
+               unsigned int row, screen_rows, screen_columns;
+
+               /* Avoid overwriting previous outputs on streaming consoles */
+               screen_rows = efi_cout_modes[efi_con_mode.mode].rows;
+               screen_columns = efi_cout_modes[efi_con_mode.mode].columns;
+               printf(ESC "[%u;%uH", screen_rows, screen_columns);
+               for (row = 1; row < screen_rows; row++)
+                       printf("\n");
+       }
+
        /*
         * The Linux console wants both a clear and a home command. The video
         * uclass does not support <ESC>[H without coordinates, yet.