mmc: sdhci-of-aspeed: Fix kunit-related build error

Randy found that with the following Kconfig settings we have duplicate
definitions (e.g. __inittest()) in sdhci-of-aspeed due to competing
module_init()/module_exit() calls from kunit and driver the itself.

```
CONFIG_MMC_SDHCI_OF_ASPEED=m
CONFIG_MMC_SDHCI_OF_ASPEED_TEST=y
```

Conditionally open-code the kunit initialisation to avoid the error.

Fixes: 7efa02a ("mmc: sdhci-of-aspeed: Add KUnit tests for phase calculations")
Reported-by: Randy Dunlap <[email protected]>
Signed-off-by: Andrew Jeffery <[email protected]>
Acked-by: Randy Dunlap <[email protected]> # build-tested
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Ulf Hansson <[email protected]>

Author: amboar

drivers/mmc/host/sdhci-of-aspeed-test.c

@@ -95,4 +95,11 @@ static struct kunit_suite aspeed_sdhci_test_suite = {
 	.name = "sdhci-of-aspeed",
 	.test_cases = aspeed_sdhci_test_cases,
 };
-kunit_test_suite(aspeed_sdhci_test_suite);
+
+static struct kunit_suite *aspeed_sdc_test_suite_array[] = {
+	&aspeed_sdhci_test_suite,
+	NULL,
+};
+
+static struct kunit_suite **aspeed_sdc_test_suites
+	__used __section(".kunit_test_suites") = aspeed_sdc_test_suite_array;

drivers/mmc/host/sdhci-of-aspeed.c

@@ -556,6 +556,29 @@ static struct platform_driver aspeed_sdc_driver = {
 	.remove		= aspeed_sdc_remove,
 };
 
+#if defined(CONFIG_MMC_SDHCI_OF_ASPEED_TEST)
+#include "sdhci-of-aspeed-test.c"
+
+static inline int aspeed_sdc_tests_init(void)
+{
+	return __kunit_test_suites_init(aspeed_sdc_test_suites);
+}
+
+static inline void aspeed_sdc_tests_exit(void)
+{
+	__kunit_test_suites_exit(aspeed_sdc_test_suites);
+}
+#else
+static inline int aspeed_sdc_tests_init(void)
+{
+	return 0;
+}
+
+static inline void aspeed_sdc_tests_exit(void)
+{
+}
+#endif
+
 static int __init aspeed_sdc_init(void)
 {
 	int rc;
@@ -566,23 +589,32 @@ static int __init aspeed_sdc_init(void)
 
 	rc = platform_driver_register(&aspeed_sdc_driver);
 	if (rc < 0)
-		platform_driver_unregister(&aspeed_sdhci_driver);
+		goto cleanup_sdhci;
+
+	rc = aspeed_sdc_tests_init();
+	if (rc < 0) {
+		platform_driver_unregister(&aspeed_sdc_driver);
+		goto cleanup_sdhci;
+	}
+
+	return 0;
+
+cleanup_sdhci:
+	platform_driver_unregister(&aspeed_sdhci_driver);
 
 	return rc;
 }
 module_init(aspeed_sdc_init);
 
 static void __exit aspeed_sdc_exit(void)
 {
+	aspeed_sdc_tests_exit();
+
 	platform_driver_unregister(&aspeed_sdc_driver);
 	platform_driver_unregister(&aspeed_sdhci_driver);
 }
 module_exit(aspeed_sdc_exit);
 
-#if defined(CONFIG_MMC_SDHCI_OF_ASPEED_TEST)
-#include "sdhci-of-aspeed-test.c"
-#endif
-
 MODULE_DESCRIPTION("Driver for the ASPEED SD/SDIO/SDHCI Controllers");
 MODULE_AUTHOR("Ryan Chen <[email protected]>");
 MODULE_AUTHOR("Andrew Jeffery <[email protected]>");