Sparse support is not always desired, make it optional.

Signed-off-by: Sascha Hauer <s.ha...@pengutronix.de>
---
 drivers/usb/gadget/Kconfig      | 10 +++++++++-
 drivers/usb/gadget/f_fastboot.c | 14 +++++++++++---
 2 files changed, 20 insertions(+), 4 deletions(-)

diff --git a/drivers/usb/gadget/Kconfig b/drivers/usb/gadget/Kconfig
index b612d39a8e..e2dc7807a0 100644
--- a/drivers/usb/gadget/Kconfig
+++ b/drivers/usb/gadget/Kconfig
@@ -57,7 +57,15 @@ config USB_GADGET_FASTBOOT
        bool
        select BANNER
        select FILE_LIST
-       select IMAGE_SPARSE
        prompt "Android Fastboot support"
 
+config USB_GADGET_FASTBOOT_SPARSE
+       bool
+       select IMAGE_SPARSE
+       prompt "Enable Fastboot sparse image support"
+       help
+         Sparse images are a way for the fastboot protocol to write
+         images that are bigger than the available memory. If unsure,
+         say yes here.
+
 endif
diff --git a/drivers/usb/gadget/f_fastboot.c b/drivers/usb/gadget/f_fastboot.c
index 87a43cc60e..8da317f83a 100644
--- a/drivers/usb/gadget/f_fastboot.c
+++ b/drivers/usb/gadget/f_fastboot.c
@@ -322,8 +322,10 @@ static int fastboot_bind(struct usb_configuration *c, 
struct usb_function *f)
        fb_setvar(var, "0.4");
        var = fb_addvar(f_fb, "bootloader-version");
        fb_setvar(var, release_string);
-       var = fb_addvar(f_fb, "max-download-size");
-       fb_setvar(var, "%u", fastboot_max_download_size);
+       if (IS_ENABLED(USB_GADGET_FASTBOOT_SPARSE)) {
+               var = fb_addvar(f_fb, "max-download-size");
+               fb_setvar(var, "%u", fastboot_max_download_size);
+       }
 
        if (IS_ENABLED(CONFIG_BAREBOX_UPDATE) && opts->export_bbu)
                bbu_handlers_iterate(fastboot_add_bbu_variables, f_fb);
@@ -906,6 +908,11 @@ static void cb_flash(struct usb_ep *ep, struct usb_request 
*req, const char *cmd
        filename = fentry->filename;
 
        if (filetype == filetype_android_sparse) {
+               if (!IS_ENABLED(USB_GADGET_FASTBOOT_SPARSE)) {
+                       fastboot_tx_print(f_fb, "FAILsparse image not 
supported");
+                       return;
+               }
+
                ret = fastboot_handle_sparse(f_fb, fentry);
                if (ret) {
                        fastboot_tx_print(f_fb, "FAILwriting sparse image: %s",
@@ -1172,7 +1179,8 @@ static void rx_handler_command(struct usb_ep *ep, struct 
usb_request *req)
 
 static int fastboot_globalvars_init(void)
 {
-       globalvar_add_simple_int("usbgadget.fastboot_max_download_size",
+       if (IS_ENABLED(USB_GADGET_FASTBOOT_SPARSE))
+               globalvar_add_simple_int("usbgadget.fastboot_max_download_size",
                                 &fastboot_max_download_size, "%u");
 
        return 0;
-- 
2.15.1


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