chrome platform firmware changes for 6.13

* Fixes
 
   - Do not double register "simple-framebuffer" platform device if
     Generic System Framebuffers (sysfb) already did that.
   - Fix a missing of unregistering platform driver in error handling
     path.
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Merge tag 'chrome-platform-firmware-for-6.13' of git://git.kernel.org/pub/scm/linux/kernel/git/chrome-platform/linux

Pull chrome platform firmware updates from Tzung-Bi Shih:

 - Do not double register "simple-framebuffer" platform device if
   Generic System Framebuffers (sysfb) already did that

 - Fix a missing of unregistering platform driver in error handling path

* tag 'chrome-platform-firmware-for-6.13' of git://git.kernel.org/pub/scm/linux/kernel/git/chrome-platform/linux:
  firmware: google: Unregister driver_info on failure
  firmware: coreboot: Don't register a pdev if screen_info data is present
  firmware: sysfb: Add a sysfb_handles_screen_info() helper function

drivers/firmware/google/framebuffer-coreboot.c

@@ -15,6 +15,7 @@
 #include <linux/module.h>
 #include <linux/platform_data/simplefb.h>
 #include <linux/platform_device.h>
+#include <linux/sysfb.h>
 
 #include "coreboot_table.h"
 
@@ -36,6 +37,19 @@ static int framebuffer_probe(struct coreboot_device *dev)
 		.format = NULL,
 	};
 
+	/*
+	 * On coreboot systems, the advertised LB_TAG_FRAMEBUFFER entry
+	 * in the coreboot table should only be used if the payload did
+	 * not pass a framebuffer information to the Linux kernel.
+	 *
+	 * If the global screen_info data has been filled, the Generic
+	 * System Framebuffers (sysfb) will already register a platform
+	 * device and pass that screen_info as platform_data to a driver
+	 * that can scan-out using the system provided framebuffer.
+	 */
+	if (sysfb_handles_screen_info())
+		return -ENODEV;
+
 	if (!fb->physical_address)
 		return -ENODEV;
 

drivers/firmware/google/gsmi.c

@@ -918,7 +918,8 @@ static __init int gsmi_init(void)
 	gsmi_dev.pdev = platform_device_register_full(&gsmi_dev_info);
 	if (IS_ERR(gsmi_dev.pdev)) {
 		printk(KERN_ERR "gsmi: unable to register platform device\n");
-		return PTR_ERR(gsmi_dev.pdev);
+		ret = PTR_ERR(gsmi_dev.pdev);
+		goto out_unregister;
 	}
 
 	/* SMI access needs to be serialized */
@@ -1056,10 +1057,11 @@ static __init int gsmi_init(void)
 	gsmi_buf_free(gsmi_dev.name_buf);
 	kmem_cache_destroy(gsmi_dev.mem_pool);
 	platform_device_unregister(gsmi_dev.pdev);
-	pr_info("gsmi: failed to load: %d\n", ret);
+out_unregister:
 #ifdef CONFIG_PM
 	platform_driver_unregister(&gsmi_driver_info);
 #endif
+	pr_info("gsmi: failed to load: %d\n", ret);
 	return ret;
 }
 

drivers/firmware/sysfb.c

@@ -79,6 +79,25 @@ void sysfb_disable(struct device *dev)
 }
 EXPORT_SYMBOL_GPL(sysfb_disable);
 
+/**
+ * sysfb_handles_screen_info() - reports if sysfb handles the global screen_info
+ *
+ * Callers can use sysfb_handles_screen_info() to determine whether the Generic
+ * System Framebuffers (sysfb) can handle the global screen_info data structure
+ * or not. Drivers might need this information to know if they have to setup the
+ * system framebuffer, or if they have to delegate this action to sysfb instead.
+ *
+ * Returns:
+ * True if sysfb handles the global screen_info data structure.
+ */
+bool sysfb_handles_screen_info(void)
+{
+	const struct screen_info *si = &screen_info;
+
+	return !!screen_info_video_type(si);
+}
+EXPORT_SYMBOL_GPL(sysfb_handles_screen_info);
+
 #if defined(CONFIG_PCI)
 static bool sysfb_pci_dev_is_enabled(struct pci_dev *pdev)
 {

include/linux/sysfb.h

@@ -60,12 +60,19 @@ struct efifb_dmi_info {
 
 void sysfb_disable(struct device *dev);
 
+bool sysfb_handles_screen_info(void);
+
 #else /* CONFIG_SYSFB */
 
 static inline void sysfb_disable(struct device *dev)
 {
 }
 
+static inline bool sysfb_handles_screen_info(void)
+{
+	return false;
+}
+
 #endif /* CONFIG_SYSFB */
 
 #ifdef CONFIG_EFI