ODROID-N2:Added force64b parameter to fbtft&spicc to increase the refresh-rate.

Ex)
modprobe spi_meson_spicc force64b=1
modprobe fbtft_device name=odroid35 rotate=90 force64b=1

Change-Id: I9545740a633f2289648e5bcf72e55fbc23aecebf

arch/arm64/boot/dts/amlogic/mesong12_odroid_common.dtsi

@@ -542,6 +542,11 @@
 			function = "gpio_periphs";
 		};
 	};
+	spicc0_pins_x: spicc0_pins_x {
+		mux {
+			drive-strength = <3>;
+		};
+	};
 	spicc0_to_gpiox: spicc0_gpiox {
 		mux {
 			groups = "GPIOX_8",

drivers/spi/spi-meson-spicc.c

@@ -27,6 +27,8 @@
 #include <linux/pinctrl/consumer.h>
 #endif
 
+#include <linux/swab.h>
+
 /*
  * The Meson SPICC controller could support DMA based transfers, but is not
  * implemented by the vendor code, and while having the registers documentation
@@ -40,6 +42,12 @@
  *   to have a CS go down over the full transfer
  */
 
+#if defined(CONFIG_ARCH_MESON64_ODROID_COMMON)
+static unsigned int force64b;
+module_param(force64b, uint, 0000);
+MODULE_PARM_DESC(force64b, "force 64bits fb data");
+#endif
+
 /* Register Map */
 #define SPICC_RXDATA	0x00
 
@@ -479,10 +487,20 @@ static void meson_spicc_setup_pio_burst(struct meson_spicc_device *spicc)
 {
 	unsigned int burst_len;
 
-	burst_len = min_t(unsigned int,
+#if defined(CONFIG_ARCH_MESON64_ODROID_COMMON)
+	if (force64b)
+		burst_len = min_t(unsigned int,
+			  spicc->xfer_remain / spicc->bytes_per_word,
+			  spicc->data->fifo_size << 1);
+	else
+		burst_len = min_t(unsigned int,
 			  spicc->xfer_remain / spicc->bytes_per_word,
 			  spicc->data->fifo_size);
-
+#else
+	burst_len = min_t(unsigned int,
+		  spicc->xfer_remain / spicc->bytes_per_word,
+		  spicc->data->fifo_size);
+#endif
 	/* Setup Xfer variables */
 	spicc->tx_remain = burst_len;
 	spicc->rx_remain = burst_len;
@@ -587,6 +605,12 @@ static int meson_spicc_transfer_one(struct spi_master *master,
 	spicc->rx_buf = (u8 *)xfer->rx_buf;
 	spicc->xfer_remain = xfer->len;
 
+#if defined(CONFIG_ARCH_MESON64_ODROID_COMMON)
+	if (force64b && (xfer->len >= 64)) {
+		if ((xfer->bits_per_word == 8) && ((xfer->len % 8) == 0))
+			xfer->bits_per_word = 64;
+	}
+#endif
 	/* Pre-calculate word size */
 	spicc->bytes_per_word =
 	   DIV_ROUND_UP(spicc->xfer->bits_per_word, 8);
@@ -1094,6 +1118,8 @@ static int meson_spicc_probe(struct platform_device *pdev)
 		spicc->pinctrl = NULL;
 		dev_err(&pdev->dev, "spi pinmux : can't get spicc_pins\n");
 	}
+	if (force64b)
+		dev_info(&pdev->dev, "*** force64b flags is true ***\n");
 #endif
 
 	device_reset_optional(&pdev->dev);

drivers/staging/fbtft/fbtft-io.c

@@ -4,6 +4,11 @@
 #include <linux/spi/spi.h>
 #include "fbtft.h"
 
+#if defined(CONFIG_ARCH_MESON64_ODROID_COMMON)
+unsigned int force64b_enable;
+EXPORT_SYMBOL(force64b_enable);
+#endif
+
 int fbtft_write_spi(struct fbtft_par *par, void *buf, size_t len)
 {
 	struct spi_transfer t = {
@@ -15,6 +20,24 @@ int fbtft_write_spi(struct fbtft_par *par, void *buf, size_t len)
 	fbtft_par_dbg_hex(DEBUG_WRITE, par, par->info->device, u8, buf, len,
 		"%s(len=%d): ", __func__, len);
 
+#if defined(CONFIG_ARCH_MESON64_ODROID_COMMON)
+	if (force64b_enable && ((len >= 64) && ((len % 8) == 0))) {
+		unsigned int i;
+		unsigned char tmp;
+		unsigned char *txbuf = (unsigned char *)buf;
+
+		for (i = 0; i < len; i += 8) {
+			tmp = txbuf[i + 0]; txbuf[i + 0] = txbuf[i + 7];
+			txbuf[i + 7] = tmp;
+			tmp = txbuf[i + 1]; txbuf[i + 1] = txbuf[i + 6];
+			txbuf[i + 6] = tmp;
+			tmp = txbuf[i + 2]; txbuf[i + 2] = txbuf[i + 5];
+			txbuf[i + 5] = tmp;
+			tmp = txbuf[i + 3]; txbuf[i + 3] = txbuf[i + 4];
+			txbuf[i + 4] = tmp;
+		}
+	}
+#endif
 	if (!par->spi) {
 		dev_err(par->info->device,
 			"%s: par->spi is unexpectedly NULL\n", __func__);

drivers/staging/fbtft/fbtft.h

@@ -284,6 +284,7 @@ int fbtft_write_gpio16_wr_latched(struct fbtft_par *par, void *buf, size_t len);
 
 #if defined(CONFIG_ARCH_MESON64_ODROID_COMMON)
 int fbtft_write_reg_wr(struct fbtft_par *par, void *buf, size_t len);
+extern unsigned int force64b_enable;
 #endif
 
 /* fbtft-bus.c */

drivers/staging/fbtft/fbtft_device.c

@@ -111,6 +111,12 @@ module_param(verbose, uint, 0);
 MODULE_PARM_DESC(verbose,
 "0 silent, >0 show gpios, >1 show devices, >2 show devices before (default=3)");
 
+#if defined(CONFIG_ARCH_MESON64_ODROID_COMMON)
+static unsigned int force64b;
+module_param(force64b, uint, 0000);
+MODULE_PARM_DESC(force64b, "override force 64bits fb data");
+#endif
+
 struct fbtft_device_display {
 	char *name;
 	struct spi_board_info *spi;
@@ -985,7 +991,7 @@ static struct fbtft_device_display displays[] = {
 		.name = "odroid35",
 		.spi = &(struct spi_board_info) {
 			.modalias = "fb_ili9486",
-			.max_speed_hz = 150000000,
+			.max_speed_hz = 100000000,
 			.mode = SPI_MODE_0,
 			.platform_data = &(struct fbtft_platform_data) {
 				.display = {
@@ -1522,6 +1528,9 @@ static int fbtft_device_spi_device_register(struct spi_board_info *spi)
 		dev_err(&master->dev, "spi_new_device() returned NULL\n");
 		return -EPERM;
 	}
+#if defined(CONFIG_ARCH_MESON64_ODROID_COMMON)
+	force64b_enable = force64b;
+#endif
 	return 0;
 }
 #else