diff mbox series

[v3] fbtft: add tearing signal detect

Message ID 1611566070-84944-1-git-send-email-zhangxuezhi3@gmail.com (mailing list archive)
State New, archived
Headers show
Series [v3] fbtft: add tearing signal detect | expand

Commit Message

Carlis Jan. 25, 2021, 9:14 a.m. UTC
From: zhangxuezhi <zhangxuezhi1@yulong.com>

For st7789v ic,add tearing signal detect to avoid screen tearing

Signed-off-by: zhangxuezhi <zhangxuezhi1@yulong.com>
---
v3:modify author name
---
 drivers/staging/fbtft/fb_st7789v.c | 134 ++++++++++++++++++++++++++++++++++++-
 drivers/staging/fbtft/fbtft.h      |   1 +
 2 files changed, 134 insertions(+), 1 deletion(-)

Comments

kernel test robot Jan. 26, 2021, 8:14 p.m. UTC | #1
Hi Carlis,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on staging/staging-testing]
[also build test WARNING on v5.11-rc5 next-20210125]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Carlis/fbtft-add-tearing-signal-detect/20210125-210428
base:   https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging.git ec52736c35f29ed96a45e641dd6aad61bc9cb6f7
config: x86_64-randconfig-r034-20210126 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 925ae8c790c7e354f12ec14a6cac6aa49fc75b29)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install x86_64 cross compiling tool for clang build
        # apt-get install binutils-x86-64-linux-gnu
        # https://github.com/0day-ci/linux/commit/480797ed48b87555bb31a8a07b600959b53fe643
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Carlis/fbtft-add-tearing-signal-detect/20210125-210428
        git checkout 480797ed48b87555bb31a8a07b600959b53fe643
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

>> drivers/staging/fbtft/fb_st7789v.c:216:5: warning: no previous prototype for function 'st7789v_write_vmem16_bus8' [-Wmissing-prototypes]
   int st7789v_write_vmem16_bus8(struct fbtft_par *par, size_t offset, size_t len)
       ^
   drivers/staging/fbtft/fb_st7789v.c:216:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   int st7789v_write_vmem16_bus8(struct fbtft_par *par, size_t offset, size_t len)
   ^
   static 
   1 warning generated.


vim +/st7789v_write_vmem16_bus8 +216 drivers/staging/fbtft/fb_st7789v.c

   208	
   209	/*****************************************************************************
   210	 *
   211	 *   int (*write_vmem)(struct fbtft_par *par);
   212	 *
   213	 *****************************************************************************/
   214	
   215	/* 16 bit pixel over 8-bit databus */
 > 216	int st7789v_write_vmem16_bus8(struct fbtft_par *par, size_t offset, size_t len)
   217	{
   218		u16 *vmem16;
   219		__be16 *txbuf16 = par->txbuf.buf;
   220		size_t remain;
   221		size_t to_copy;
   222		size_t tx_array_size;
   223		int i;
   224		int rc, ret = 0;
   225		size_t startbyte_size = 0;
   226	
   227		fbtft_par_dbg(DEBUG_WRITE_VMEM, par, "st7789v ---%s(offset=%zu, len=%zu)\n",
   228			      __func__, offset, len);
   229	
   230		remain = len / 2;
   231		vmem16 = (u16 *)(par->info->screen_buffer + offset);
   232	
   233		if (par->gpio.dc)
   234			gpiod_set_value(par->gpio.dc, 1);
   235	
   236		/* non buffered write */
   237		if (!par->txbuf.buf)
   238			return par->fbtftops.write(par, vmem16, len);
   239	
   240		/* buffered write */
   241		tx_array_size = par->txbuf.len / 2;
   242	
   243		if (par->startbyte) {
   244			txbuf16 = par->txbuf.buf + 1;
   245			tx_array_size -= 2;
   246			*(u8 *)(par->txbuf.buf) = par->startbyte | 0x2;
   247			startbyte_size = 1;
   248		}
   249	
   250		while (remain) {
   251			to_copy = min(tx_array_size, remain);
   252			dev_dbg(par->info->device, "    to_copy=%zu, remain=%zu\n",
   253				to_copy, remain - to_copy);
   254	
   255			for (i = 0; i < to_copy; i++)
   256				txbuf16[i] = cpu_to_be16(vmem16[i]);
   257	
   258			vmem16 = vmem16 + to_copy;
   259			if (par->gpio.te) {
   260				enable_spi_panel_te_irq(par, true);
   261				reinit_completion(&spi_panel_te);
   262				rc = wait_for_completion_timeout(&spi_panel_te,
   263								 msecs_to_jiffies(SPI_PANEL_TE_TIMEOUT));
   264				if (rc == 0)
   265					pr_err("wait panel TE time out\n");
   266			}
   267			ret = par->fbtftops.write(par, par->txbuf.buf,
   268									startbyte_size + to_copy * 2);
   269			if (par->gpio.te)
   270				enable_spi_panel_te_irq(par, false);
   271			if (ret < 0)
   272				return ret;
   273			remain -= to_copy;
   274		}
   275	
   276		return ret;
   277	}
   278	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
diff mbox series

Patch

diff --git a/drivers/staging/fbtft/fb_st7789v.c b/drivers/staging/fbtft/fb_st7789v.c
index 3a280cc..5426276 100644
--- a/drivers/staging/fbtft/fb_st7789v.c
+++ b/drivers/staging/fbtft/fb_st7789v.c
@@ -9,9 +9,12 @@ 
 #include <linux/delay.h>
 #include <linux/init.h>
 #include <linux/kernel.h>
+#include <linux/mutex.h>
+#include <linux/interrupt.h>
+#include <linux/completion.h>
 #include <linux/module.h>
 #include <video/mipi_display.h>
-
+#include <linux/gpio/consumer.h>
 #include "fbtft.h"
 
 #define DRVNAME "fb_st7789v"
@@ -66,6 +69,38 @@  enum st7789v_command {
 #define MADCTL_MX BIT(6) /* bitmask for column address order */
 #define MADCTL_MY BIT(7) /* bitmask for page address order */
 
+#define SPI_PANEL_TE_TIMEOUT	400
+static struct mutex te_mutex;/*mutex for tearing line*/
+static struct completion spi_panel_te;
+
+static irqreturn_t spi_panel_te_handler(int irq, void *data)
+{
+	complete(&spi_panel_te);
+	return IRQ_HANDLED;
+}
+
+static void enable_spi_panel_te_irq(struct fbtft_par *par, bool enable)
+{
+	static int te_irq_count;
+
+	if (!par->gpio.te) {
+		pr_err("%s:%d,SPI panel TE GPIO not configured\n",
+		       __func__, __LINE__);
+		return;
+	}
+
+	mutex_lock(&te_mutex);
+
+	if (enable) {
+		if (++te_irq_count == 1)
+			enable_irq(gpiod_to_irq(par->gpio.te));
+	} else {
+		if (--te_irq_count == 0)
+			disable_irq(gpiod_to_irq(par->gpio.te));
+	}
+	mutex_unlock(&te_mutex);
+}
+
 /**
  * init_display() - initialize the display controller
  *
@@ -82,6 +117,29 @@  enum st7789v_command {
  */
 static int init_display(struct fbtft_par *par)
 {
+	int rc;
+	struct device *dev = par->info->device;
+
+	par->gpio.te = devm_gpiod_get_index_optional(dev, "te", 0, GPIOD_IN);
+	if (par->gpio.te) {
+		init_completion(&spi_panel_te);
+		mutex_init(&te_mutex);
+		rc = devm_request_irq(dev,
+				      gpiod_to_irq(par->gpio.te),
+				     spi_panel_te_handler, IRQF_TRIGGER_RISING,
+				     "TE_GPIO", par);
+		if (rc) {
+			pr_err("TE request_irq failed.\n");
+			devm_gpiod_put(dev, par->gpio.te);
+			par->gpio.te = NULL;
+		} else {
+			disable_irq_nosync(gpiod_to_irq(par->gpio.te));
+			pr_info("TE request_irq completion.\n");
+		}
+	} else {
+		pr_err("%s:%d, TE gpio not specified\n",
+		       __func__, __LINE__);
+	}
 	/* turn off sleep mode */
 	write_reg(par, MIPI_DCS_EXIT_SLEEP_MODE);
 	mdelay(120);
@@ -137,6 +195,9 @@  static int init_display(struct fbtft_par *par)
 	 */
 	write_reg(par, PWCTRL1, 0xA4, 0xA1);
 
+    /*Tearing Effect Line On*/
+	if (par->gpio.te)
+		write_reg(par, 0x35, 0x00);
 	write_reg(par, MIPI_DCS_SET_DISPLAY_ON);
 
 	if (HSD20_IPS)
@@ -145,6 +206,76 @@  static int init_display(struct fbtft_par *par)
 	return 0;
 }
 
+/*****************************************************************************
+ *
+ *   int (*write_vmem)(struct fbtft_par *par);
+ *
+ *****************************************************************************/
+
+/* 16 bit pixel over 8-bit databus */
+int st7789v_write_vmem16_bus8(struct fbtft_par *par, size_t offset, size_t len)
+{
+	u16 *vmem16;
+	__be16 *txbuf16 = par->txbuf.buf;
+	size_t remain;
+	size_t to_copy;
+	size_t tx_array_size;
+	int i;
+	int rc, ret = 0;
+	size_t startbyte_size = 0;
+
+	fbtft_par_dbg(DEBUG_WRITE_VMEM, par, "st7789v ---%s(offset=%zu, len=%zu)\n",
+		      __func__, offset, len);
+
+	remain = len / 2;
+	vmem16 = (u16 *)(par->info->screen_buffer + offset);
+
+	if (par->gpio.dc)
+		gpiod_set_value(par->gpio.dc, 1);
+
+	/* non buffered write */
+	if (!par->txbuf.buf)
+		return par->fbtftops.write(par, vmem16, len);
+
+	/* buffered write */
+	tx_array_size = par->txbuf.len / 2;
+
+	if (par->startbyte) {
+		txbuf16 = par->txbuf.buf + 1;
+		tx_array_size -= 2;
+		*(u8 *)(par->txbuf.buf) = par->startbyte | 0x2;
+		startbyte_size = 1;
+	}
+
+	while (remain) {
+		to_copy = min(tx_array_size, remain);
+		dev_dbg(par->info->device, "    to_copy=%zu, remain=%zu\n",
+			to_copy, remain - to_copy);
+
+		for (i = 0; i < to_copy; i++)
+			txbuf16[i] = cpu_to_be16(vmem16[i]);
+
+		vmem16 = vmem16 + to_copy;
+		if (par->gpio.te) {
+			enable_spi_panel_te_irq(par, true);
+			reinit_completion(&spi_panel_te);
+			rc = wait_for_completion_timeout(&spi_panel_te,
+							 msecs_to_jiffies(SPI_PANEL_TE_TIMEOUT));
+			if (rc == 0)
+				pr_err("wait panel TE time out\n");
+		}
+		ret = par->fbtftops.write(par, par->txbuf.buf,
+								startbyte_size + to_copy * 2);
+		if (par->gpio.te)
+			enable_spi_panel_te_irq(par, false);
+		if (ret < 0)
+			return ret;
+		remain -= to_copy;
+	}
+
+	return ret;
+}
+
 /**
  * set_var() - apply LCD properties like rotation and BGR mode
  *
@@ -259,6 +390,7 @@  static int blank(struct fbtft_par *par, bool on)
 	.gamma = HSD20_IPS_GAMMA,
 	.fbtftops = {
 		.init_display = init_display,
+		.write_vmem = st7789v_write_vmem16_bus8,
 		.set_var = set_var,
 		.set_gamma = set_gamma,
 		.blank = blank,
diff --git a/drivers/staging/fbtft/fbtft.h b/drivers/staging/fbtft/fbtft.h
index 76f8c09..93bac05 100644
--- a/drivers/staging/fbtft/fbtft.h
+++ b/drivers/staging/fbtft/fbtft.h
@@ -212,6 +212,7 @@  struct fbtft_par {
 		struct gpio_desc *wr;
 		struct gpio_desc *latch;
 		struct gpio_desc *cs;
+		struct gpio_desc *te;
 		struct gpio_desc *db[16];
 		struct gpio_desc *led[16];
 		struct gpio_desc *aux[16];