Re: [PATCH] fbtft: add tearing signal detect
On Tue, 26 Jan 2021 10:54:41 +0300
Dan Carpenter wrote:
> On Sun, Jan 24, 2021 at 11:35:37PM +0800, Carlis wrote:
> > +static irqreturn_t spi_panel_te_handler(int irq, void *data)
> > +{
> > + complete(_panel_te);
> > + return IRQ_HANDLED;
> > +}
> > +
> > +static void enable_spi_panel_te_irq(struct fbtft_par *par, bool
> > enable)
>
> It quite confused me that enable actually disables. I always feel
> like it's clearer to write these as two separate functions.
>
> > +{
> > + static int te_irq_count;
> > +
> > + if (!par->gpio.te) {
>
> This is always checked in the caller. And it's when it's NULL that
> means it's deliberate so don't print a message.
>
> > + pr_err("%s:%d,SPI panel TE GPIO not configured\n",
> > + __func__, __LINE__);
> > + return;
> > + }
> > +
> > + mutex_lock(_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(_mutex);
> > +}
> > +
> > /**
> > * init_display() - initialize the display controller
> > *
> > @@ -82,6 +117,28 @@ 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) {
>
> devm_gpiod_get_index_optional() can return NULL or error pointers. If
> it returns NULL then don't print an error message. NULL reports are
> deliberate.
>
> par->gpio.te = devm_gpiod_get_index_optional(dev, "te", 0,
> GPIOD_IN); if (IS_ERR(par->gpio.te)) {
> pr_err("%s:%d, TE gpio not specified\n", __func__,
> __LINE__); return PTR_ERR(par->gpio.te);
> }
>
> if (par->gpio.te) {
>
>
> > + init_completion(_panel_te);
> > + mutex_init(_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");
> > + par->gpio.te = NULL;
> > + } else {
> > +
> > disable_irq_nosync(gpiod_to_irq(par->gpio.te));
> > + pr_err("TE request_irq completion.\n");
>
> Why is this printing an error message if devm_request_irq() succeeds?
>
> > + }
> > + } 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 +194,9 @@ 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 +205,76 @@ 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;
>
> Delete one of these "rc" or "rec" variables.
>
> > + 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++)
Re: [PATCH] fbtft: add tearing signal detect
On Sun, Jan 24, 2021 at 11:35:37PM +0800, Carlis wrote:
> +static irqreturn_t spi_panel_te_handler(int irq, void *data)
> +{
> + complete(_panel_te);
> + return IRQ_HANDLED;
> +}
> +
> +static void enable_spi_panel_te_irq(struct fbtft_par *par, bool enable)
It quite confused me that enable actually disables. I always feel like
it's clearer to write these as two separate functions.
> +{
> + static int te_irq_count;
> +
> + if (!par->gpio.te) {
This is always checked in the caller. And it's when it's NULL that
means it's deliberate so don't print a message.
> + pr_err("%s:%d,SPI panel TE GPIO not configured\n",
> +__func__, __LINE__);
> + return;
> + }
> +
> + mutex_lock(_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(_mutex);
> +}
> +
> /**
> * init_display() - initialize the display controller
> *
> @@ -82,6 +117,28 @@ 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) {
devm_gpiod_get_index_optional() can return NULL or error pointers. If
it returns NULL then don't print an error message. NULL reports are
deliberate.
par->gpio.te = devm_gpiod_get_index_optional(dev, "te", 0, GPIOD_IN);
if (IS_ERR(par->gpio.te)) {
pr_err("%s:%d, TE gpio not specified\n", __func__, __LINE__);
return PTR_ERR(par->gpio.te);
}
if (par->gpio.te) {
> + init_completion(_panel_te);
> + mutex_init(_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");
> + par->gpio.te = NULL;
> + } else {
> + disable_irq_nosync(gpiod_to_irq(par->gpio.te));
> + pr_err("TE request_irq completion.\n");
Why is this printing an error message if devm_request_irq() succeeds?
> + }
> + } 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 +194,9 @@ 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 +205,76 @@ 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;
Delete one of these "rc" or "rec" variables.
> + 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) {
> +
[PATCH] fbtft: add tearing signal detect
From: "carlis.zhang_cp"
For st7789v ic,add tearing signal detect to avoid screen tearing
Signed-off-by: carlis.zhang_cp
---
drivers/staging/fbtft/fb_st7789v.c | 133 -
drivers/staging/fbtft/fbtft.h | 1 +
2 files changed, 133 insertions(+), 1 deletion(-)
diff --git a/drivers/staging/fbtft/fb_st7789v.c
b/drivers/staging/fbtft/fb_st7789v.c
index 3a280cc..c687b58 100644
--- a/drivers/staging/fbtft/fb_st7789v.c
+++ b/drivers/staging/fbtft/fb_st7789v.c
@@ -9,9 +9,12 @@
#include
#include
#include
+#include
+#include
+#include
#include
#include
-
+#include
#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(_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(_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(_mutex);
+}
+
/**
* init_display() - initialize the display controller
*
@@ -82,6 +117,28 @@ 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(_panel_te);
+ mutex_init(_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");
+ par->gpio.te = NULL;
+ } else {
+ disable_irq_nosync(gpiod_to_irq(par->gpio.te));
+ pr_err("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 +194,9 @@ 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 +205,76 @@ 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) {
+
