add SPI DMA to FunKey S dts

Signed-off-by: Vincent-FK <vincent.buso@funkey-project.com>

Author: Vincent-FK

arch/arm/boot/dts/sun8i-v3s-funkey.dts

@@ -176,7 +176,7 @@
                compatible = "sitronix,st7789v";
                reg = <0>;
                spi-max-frequency = <50000000>;
-               txbuflen = <115200>;
+               txbuflen = <115202>;
                rotate = <0>;
                fps = <50>;
                buswidth = <8>;

arch/arm/boot/dts/sun8i-v3s.dtsi

@@ -539,6 +539,8 @@
 			interrupts = <GIC_SPI 65 IRQ_TYPE_LEVEL_HIGH>;
 			clocks = <&ccu CLK_BUS_SPI0>, <&ccu CLK_SPI0>;
 			clock-names = "ahb", "mod";
+			dmas = <&dma 23>, <&dma 23>;
+			dma-names = "rx", "tx";
 			pinctrl-names = "default";
 			pinctrl-0 = <&spi0_pins>;
 			resets = <&ccu RST_BUS_SPI0>;

drivers/staging/fbtft/fbtft-core.c

@@ -837,7 +837,7 @@ struct fb_info *fbtft_framebuffer_alloc(struct fbtft_display *display,
 	/* Transmit buffer */
 	if (txbuflen == -1)
 		txbuflen = vmem_size + 2; /* add in case startbyte is used */
-	if (txbuflen >= vmem_size + 2)
+	if (txbuflen > vmem_size + 2)
 		txbuflen = 0;
 
 #ifdef __LITTLE_ENDIAN