samsung-j1mini3g: fix X11 and framebuffer colors (!753)

[ci:skip-build]: already built successfully in CI

device/linux-samsung-j1mini3g/APKBUILD

@@ -3,7 +3,7 @@
 
 pkgname="linux-samsung-j1mini3g"
 pkgver=3.10.106
-pkgrel=0
+pkgrel=1
 pkgdesc="Samsung Galaxy J1 mini kernel fork"
 arch="armv7"
 _carch="arm"
@@ -27,6 +27,8 @@ source="
 	gcc7-give-up-on-ilog2-const-optimizations.patch
 	gcc8-fix-put-user.patch
 	fix-dts.patch
+	sprdfb-fix-swapped-colors.patch
+	sprdfb-check-for-buffering.patch
 "
 builddir="$srcdir/${_repository}-${_commit}"
 
@@ -69,7 +71,9 @@ package() {
 }
 
 sha512sums="f1686df6ee6e1f24c6460295c830b67b2146ab5b34ead2291fa92c3f83ba12884db875b0c6e31ff305ff64a82636648ee237c13f09c99e158449457285352388  linux-samsung-j1mini3g-6a377f7c43a84b578df39300dcce9fb9cb387a21.tar.gz
-6828c7c82b11f98bfc185b50c186922ca555026a2c648cfd460a5262f879e278f32aa467b8bdfdca2827d7f0c8fc9342a859b105fa76ea9345ff640b2064cd26  config-samsung-j1mini3g.armhf
+6828c7c82b11f98bfc185b50c186922ca555026a2c648cfd460a5262f879e278f32aa467b8bdfdca2827d7f0c8fc9342a859b105fa76ea9345ff640b2064cd26  config-samsung-j1mini3g.armv7
 77eba606a71eafb36c32e9c5fe5e77f5e4746caac292440d9fb720763d766074a964db1c12bc76fe583c5d1a5c864219c59941f5e53adad182dbc70bf2bc14a7  gcc7-give-up-on-ilog2-const-optimizations.patch
 197d40a214ada87fcb2dfc0ae4911704b9a93354b75179cd6b4aadbb627a37ec262cf516921c84a8b1806809b70a7b440cdc8310a4a55fca5d2c0baa988e3967  gcc8-fix-put-user.patch
-a4c04f8f0bd70ab8090faf08fe17592fe275a6be6d5a052f3dc3405062b8d11f08aba637d2ca5cecefcfecf64738a1e1704042ef747ecbef845579dba9b43b5d  fix-dts.patch"
+a4c04f8f0bd70ab8090faf08fe17592fe275a6be6d5a052f3dc3405062b8d11f08aba637d2ca5cecefcfecf64738a1e1704042ef747ecbef845579dba9b43b5d  fix-dts.patch
+6836001b24508d413a059f19b0c6f6f547037f68886c22159ad51be91d1a089e3d1d9ed79c3c62724648df7f810cd81d96a83f4a34368b373524b649e5539656  sprdfb-fix-swapped-colors.patch
+e33ed12de874c1c8bc9231aea3b0389b18ee0ff804e39c0f47d9cbf657ea19015370d6114846c2d142fbdb88f472f0e65811c53b9b335feb8ae2f30dffdf4846  sprdfb-check-for-buffering.patch"

device/linux-samsung-j1mini3g/sprdfb-check-for-buffering.patch

+sprdfb_check_var() has two problems:
+I) it is not buffering-aware, which all Spreadtrum devices use;
+II) it checks values that are already in yres_virtual, not those that we
+are trying to overwrite.
+Those problems stop X11 and charging-sdl from working properly.
+X11 error:
+(EE) FBDEV(0): FBIOPUT_VSCREENINFO: Invalid argument
+This patch fixes first problem, however, the correct way is fixing
+the second one, as this might have less side effects.
+
+diff --git a/drivers/video/sprdfb/sprdfb_main.c b/drivers/video/sprdfb/sprdfb_main.c
+index 43876285..751616a1 100644
+--- a/drivers/video/sprdfb/sprdfb_main.c
++++ b/drivers/video/sprdfb/sprdfb_main.c
+@@ -531,7 +531,8 @@ static int sprdfb_check_var(struct fb_var_screeninfo *var, struct fb_info *fb)
+ 	if ((var->xres != fb->var.xres) ||
+ 		(var->yres != fb->var.yres) ||
+ 		(var->xres_virtual != fb->var.xres_virtual) ||
+-		(var->yres_virtual != fb->var.yres_virtual) ||
++		// (var->yres_virtual != fb->var.yres_virtual) ||
++	    	(fb->var.yres_virtual % var->yres_virtual != 0) ||
+ 		(var->xoffset != fb->var.xoffset) ||
+ #ifndef BIT_PER_PIXEL_SURPPORT
+ 		(var->bits_per_pixel != fb->var.bits_per_pixel) ||

device/linux-samsung-j1mini3g/sprdfb-fix-swapped-colors.patch

+By default, color channels on Spreadtrum devices are swapped. This patch makes kernel use BGR565, which has normal color channels.
+
+diff --git a/drivers/video/sprdfb/sprdfb_main.c b/drivers/video/sprdfb/sprdfb_main.c
+index 3e6c70d..80fceb9 100644
+--- a/drivers/video/sprdfb/sprdfb_main.c
++++ b/drivers/video/sprdfb/sprdfb_main.c
+@@ -51,7 +51,7 @@ enum{
+ 	SPRD_IN_DATA_TYPE_LIMIT
+ };
+ 
+-#define SPRDFB_IN_DATA_TYPE SPRD_IN_DATA_TYPE_ABGR888
++#define SPRDFB_IN_DATA_TYPE SPRD_IN_DATA_TYPE_BGR565
+ 
+ #ifdef CONFIG_FB_TRIPLE_FRAMEBUFFER
+ #define FRAMEBUFFER_NR		(3)