[PATCH v3 1/4] staging: fbtft: Rectify GPIO handling

28 Apr 2021

The infamous commit c440eee1a7a1 ("Staging: staging: fbtft: Switch to
the GPIO descriptor interface") broke GPIO handling completely.
It has already four commits to rectify and it seems not enough.
In order to fix the mess here we:
1) Set default to "inactive" for all requested pins
2) Fix CS#, RD#, and WR# pins polarity since it's active low
     and GPIO descriptor interface takes it into consideration
     from the Device Tree or ACPI
3) Consolidate chip activation (CS# assertion) under default
     ->reset() callback
To summarize the expectations about polarity for GPIOs:
RD#			Low
   WR#			Low
   CS#			Low
   RESET#		Low
   DC or RS		High
   RW			High
   Data	0 .. 15		High
See also Adafruit learning course [1] for the example of the schematics.
While at it, drop unneeded NULL checks, since GPIO API is tolerant to that.
[1]: https://learn.adafruit.com/adafruit-2-8-and-3-2-color-tft-touchscreen-breako...
Fixes: 92e3e884887c ("Staging: staging: fbtft: Fix GPIO handling")
Fixes: b918d1c27066 ("Staging: staging: fbtft: Fix reset assertion when using gpio descriptor")
Fixes: dbc4f989c878 ("Staging: staging: fbtft: Fix probing of gpio descriptor")
Fixes: c440eee1a7a1 ("Staging: staging: fbtft: Switch to the gpio descriptor interface")
Cc: Jan Sebastian Götte linux@jaseg.net
Cc: Nishad Kamdar nishadkamdar@gmail.com
Signed-off-by: Andy Shevchenko andriy.shevchenko@linux.intel.com
Reviewed-by: Phil Reid preid@electromag.com.au
---
 drivers/staging/fbtft/fb_agm1264k-fl.c | 20 ++++++++++----------
 drivers/staging/fbtft/fb_bd663474.c    |  4 ----
 drivers/staging/fbtft/fb_ili9163.c     |  4 ----
 drivers/staging/fbtft/fb_ili9320.c     |  1 -
 drivers/staging/fbtft/fb_ili9325.c     |  4 ----
 drivers/staging/fbtft/fb_ili9340.c     |  1 -
 drivers/staging/fbtft/fb_s6d1121.c     |  4 ----
 drivers/staging/fbtft/fb_sh1106.c      |  1 -
 drivers/staging/fbtft/fb_ssd1289.c     |  4 ----
 drivers/staging/fbtft/fb_ssd1325.c     |  2 --
 drivers/staging/fbtft/fb_ssd1331.c     |  6 ++----
 drivers/staging/fbtft/fb_ssd1351.c     |  1 -
 drivers/staging/fbtft/fb_upd161704.c   |  4 ----
 drivers/staging/fbtft/fb_watterott.c   |  1 -
 drivers/staging/fbtft/fbtft-bus.c      |  3 +--
 drivers/staging/fbtft/fbtft-core.c     | 13 ++++++-------
 drivers/staging/fbtft/fbtft-io.c       | 12 ++++++------
 17 files changed, 25 insertions(+), 60 deletions(-)

diff --git a/drivers/staging/fbtft/fb_agm1264k-fl.c b/drivers/staging/fbtft/fb_agm1264k-fl.c
index eeeeec97ad27..b545c2ca80a4 100644
--- a/drivers/staging/fbtft/fb_agm1264k-fl.c
+++ b/drivers/staging/fbtft/fb_agm1264k-fl.c
@@ -84,9 +84,9 @@ static void reset(struct fbtft_par *par)
dev_dbg(par->info->device, "%s()\n", __func__);
-	gpiod_set_value(par->gpio.reset, 0);
-	udelay(20);
    gpiod_set_value(par->gpio.reset, 1);
+	udelay(20);
+	gpiod_set_value(par->gpio.reset, 0);
    mdelay(120);
 }
@@ -194,12 +194,12 @@ static void write_reg8_bus8(struct fbtft_par *par, int len, ...)
    /* select chip */
    if (*buf) {
    	/* cs1 */
-		gpiod_set_value(par->CS0, 1);
-		gpiod_set_value(par->CS1, 0);
-	} else {
-		/* cs0 */
    	gpiod_set_value(par->CS0, 0);
    	gpiod_set_value(par->CS1, 1);
+	} else {
+		/* cs0 */
+		gpiod_set_value(par->CS0, 1);
+		gpiod_set_value(par->CS1, 0);
    }
gpiod_set_value(par->RS, 0); /* RS->0 (command mode) */
@@ -397,8 +397,8 @@ static int write_vmem(struct fbtft_par *par, size_t offset, size_t len)
    }
    kfree(convert_buf);
-	gpiod_set_value(par->CS0, 1);
-	gpiod_set_value(par->CS1, 1);
+	gpiod_set_value(par->CS0, 0);
+	gpiod_set_value(par->CS1, 0);
return ret;
 }
@@ -419,10 +419,10 @@ static int write(struct fbtft_par *par, void *buf, size_t len)
    	for (i = 0; i < 8; ++i)
    		gpiod_set_value(par->gpio.db[i], data & (1 << i));
    	/* set E */
-		gpiod_set_value(par->EPIN, 1);
+		gpiod_set_value(par->EPIN, 0);
    	udelay(5);
    	/* unset E - write */
-		gpiod_set_value(par->EPIN, 0);
+		gpiod_set_value(par->EPIN, 1);
    	udelay(1);
    }
diff --git a/drivers/staging/fbtft/fb_bd663474.c b/drivers/staging/fbtft/fb_bd663474.c
index e2c7646588f8..1629c2c440a9 100644
--- a/drivers/staging/fbtft/fb_bd663474.c
+++ b/drivers/staging/fbtft/fb_bd663474.c
@@ -12,7 +12,6 @@
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/init.h>
-#include <linux/gpio/consumer.h>
 #include <linux/delay.h>
#include "fbtft.h"
@@ -24,9 +23,6 @@
static int init_display(struct fbtft_par *par)
 {
-	if (par->gpio.cs)
-		gpiod_set_value(par->gpio.cs, 0);  /* Activate chip */
-
    par->fbtftops.reset(par);
/* Initialization sequence from Lib_UTFT */
diff --git a/drivers/staging/fbtft/fb_ili9163.c b/drivers/staging/fbtft/fb_ili9163.c
index 05648c3ffe47..6582a2c90aaf 100644
--- a/drivers/staging/fbtft/fb_ili9163.c
+++ b/drivers/staging/fbtft/fb_ili9163.c
@@ -11,7 +11,6 @@
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/init.h>
-#include <linux/gpio/consumer.h>
 #include <linux/delay.h>
 #include <video/mipi_display.h>
@@ -77,9 +76,6 @@ static int init_display(struct fbtft_par *par)
 {
    par->fbtftops.reset(par);
-	if (par->gpio.cs)
-		gpiod_set_value(par->gpio.cs, 0);  /* Activate chip */
-
    write_reg(par, MIPI_DCS_SOFT_RESET); /* software reset */
    mdelay(500);
    write_reg(par, MIPI_DCS_EXIT_SLEEP_MODE); /* exit sleep */
diff --git a/drivers/staging/fbtft/fb_ili9320.c b/drivers/staging/fbtft/fb_ili9320.c
index f2e72d14431d..a8f4c618b754 100644
--- a/drivers/staging/fbtft/fb_ili9320.c
+++ b/drivers/staging/fbtft/fb_ili9320.c
@@ -8,7 +8,6 @@
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/init.h>
-#include <linux/gpio/consumer.h>
 #include <linux/spi/spi.h>
 #include <linux/delay.h>
diff --git a/drivers/staging/fbtft/fb_ili9325.c b/drivers/staging/fbtft/fb_ili9325.c
index c9aa4cb43123..16d3b17ca279 100644
--- a/drivers/staging/fbtft/fb_ili9325.c
+++ b/drivers/staging/fbtft/fb_ili9325.c
@@ -10,7 +10,6 @@
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/init.h>
-#include <linux/gpio/consumer.h>
 #include <linux/delay.h>
#include "fbtft.h"
@@ -85,9 +84,6 @@ static int init_display(struct fbtft_par *par)
 {
    par->fbtftops.reset(par);
-	if (par->gpio.cs)
-		gpiod_set_value(par->gpio.cs, 0);  /* Activate chip */
-
    bt &= 0x07;
    vc &= 0x07;
    vrh &= 0x0f;
diff --git a/drivers/staging/fbtft/fb_ili9340.c b/drivers/staging/fbtft/fb_ili9340.c
index 415183c7054a..704236bcaf3f 100644
--- a/drivers/staging/fbtft/fb_ili9340.c
+++ b/drivers/staging/fbtft/fb_ili9340.c
@@ -8,7 +8,6 @@
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/init.h>
-#include <linux/gpio/consumer.h>
 #include <linux/delay.h>
 #include <video/mipi_display.h>
diff --git a/drivers/staging/fbtft/fb_s6d1121.c b/drivers/staging/fbtft/fb_s6d1121.c
index 8c7de3290343..62f27172f844 100644
--- a/drivers/staging/fbtft/fb_s6d1121.c
+++ b/drivers/staging/fbtft/fb_s6d1121.c
@@ -12,7 +12,6 @@
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/init.h>
-#include <linux/gpio/consumer.h>
 #include <linux/delay.h>
#include "fbtft.h"
@@ -29,9 +28,6 @@ static int init_display(struct fbtft_par *par)
 {
    par->fbtftops.reset(par);
-	if (par->gpio.cs)
-		gpiod_set_value(par->gpio.cs, 0);  /* Activate chip */
-
    /* Initialization sequence from Lib_UTFT */
write_reg(par, 0x0011, 0x2004);
diff --git a/drivers/staging/fbtft/fb_sh1106.c b/drivers/staging/fbtft/fb_sh1106.c
index 6f7249493ea3..7b9ab39e1c1a 100644
--- a/drivers/staging/fbtft/fb_sh1106.c
+++ b/drivers/staging/fbtft/fb_sh1106.c
@@ -9,7 +9,6 @@
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/init.h>
-#include <linux/gpio/consumer.h>
 #include <linux/delay.h>
#include "fbtft.h"
diff --git a/drivers/staging/fbtft/fb_ssd1289.c b/drivers/staging/fbtft/fb_ssd1289.c
index 7a3fe022cc69..f27bab38b3ec 100644
--- a/drivers/staging/fbtft/fb_ssd1289.c
+++ b/drivers/staging/fbtft/fb_ssd1289.c
@@ -10,7 +10,6 @@
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/init.h>
-#include <linux/gpio/consumer.h>
#include "fbtft.h"
@@ -28,9 +27,6 @@ static int init_display(struct fbtft_par *par)
 {
    par->fbtftops.reset(par);
-	if (par->gpio.cs)
-		gpiod_set_value(par->gpio.cs, 0);  /* Activate chip */
-
    write_reg(par, 0x00, 0x0001);
    write_reg(par, 0x03, 0xA8A4);
    write_reg(par, 0x0C, 0x0000);
diff --git a/drivers/staging/fbtft/fb_ssd1325.c b/drivers/staging/fbtft/fb_ssd1325.c
index 8a3140d41d8b..796a2ac3e194 100644
--- a/drivers/staging/fbtft/fb_ssd1325.c
+++ b/drivers/staging/fbtft/fb_ssd1325.c
@@ -35,8 +35,6 @@ static int init_display(struct fbtft_par *par)
 {
    par->fbtftops.reset(par);
-	gpiod_set_value(par->gpio.cs, 0);
-
    write_reg(par, 0xb3);
    write_reg(par, 0xf0);
    write_reg(par, 0xae);
diff --git a/drivers/staging/fbtft/fb_ssd1331.c b/drivers/staging/fbtft/fb_ssd1331.c
index 37622c9462aa..ec5eced7f8cb 100644
--- a/drivers/staging/fbtft/fb_ssd1331.c
+++ b/drivers/staging/fbtft/fb_ssd1331.c
@@ -81,8 +81,7 @@ static void write_reg8_bus8(struct fbtft_par *par, int len, ...)
    va_start(args, len);
*buf = (u8)va_arg(args, unsigned int);
-	if (par->gpio.dc)
-		gpiod_set_value(par->gpio.dc, 0);
+	gpiod_set_value(par->gpio.dc, 0);
    ret = par->fbtftops.write(par, par->buf, sizeof(u8));
    if (ret < 0) {
    	va_end(args);
@@ -104,8 +103,7 @@ static void write_reg8_bus8(struct fbtft_par *par, int len, ...)
    		return;
    	}
    }
-	if (par->gpio.dc)
-		gpiod_set_value(par->gpio.dc, 1);
+	gpiod_set_value(par->gpio.dc, 1);
    va_end(args);
 }
diff --git a/drivers/staging/fbtft/fb_ssd1351.c b/drivers/staging/fbtft/fb_ssd1351.c
index 900b28d826b2..cf263a58a148 100644
--- a/drivers/staging/fbtft/fb_ssd1351.c
+++ b/drivers/staging/fbtft/fb_ssd1351.c
@@ -2,7 +2,6 @@
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/init.h>
-#include <linux/gpio/consumer.h>
 #include <linux/spi/spi.h>
 #include <linux/delay.h>
diff --git a/drivers/staging/fbtft/fb_upd161704.c b/drivers/staging/fbtft/fb_upd161704.c
index c77832ae5e5b..c680160d6380 100644
--- a/drivers/staging/fbtft/fb_upd161704.c
+++ b/drivers/staging/fbtft/fb_upd161704.c
@@ -12,7 +12,6 @@
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/init.h>
-#include <linux/gpio/consumer.h>
 #include <linux/delay.h>
#include "fbtft.h"
@@ -26,9 +25,6 @@ static int init_display(struct fbtft_par *par)
 {
    par->fbtftops.reset(par);
-	if (par->gpio.cs)
-		gpiod_set_value(par->gpio.cs, 0);  /* Activate chip */
-
    /* Initialization sequence from Lib_UTFT */
/* register reset */
diff --git a/drivers/staging/fbtft/fb_watterott.c b/drivers/staging/fbtft/fb_watterott.c
index 76b25df376b8..a57e1f4feef3 100644
--- a/drivers/staging/fbtft/fb_watterott.c
+++ b/drivers/staging/fbtft/fb_watterott.c
@@ -8,7 +8,6 @@
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/init.h>
-#include <linux/gpio/consumer.h>
 #include <linux/delay.h>
#include "fbtft.h"
diff --git a/drivers/staging/fbtft/fbtft-bus.c b/drivers/staging/fbtft/fbtft-bus.c
index 63c65dd67b17..3d422bc11641 100644
--- a/drivers/staging/fbtft/fbtft-bus.c
+++ b/drivers/staging/fbtft/fbtft-bus.c
@@ -135,8 +135,7 @@ int fbtft_write_vmem16_bus8(struct fbtft_par *par, size_t offset, size_t len)
    remain = len / 2;
    vmem16 = (u16 *)(par->info->screen_buffer + offset);
-	if (par->gpio.dc)
-		gpiod_set_value(par->gpio.dc, 1);
+	gpiod_set_value(par->gpio.dc, 1);
/* non buffered write */
    if (!par->txbuf.buf)
diff --git a/drivers/staging/fbtft/fbtft-core.c b/drivers/staging/fbtft/fbtft-core.c
index 4f362dad4436..67c3b1975a4d 100644
--- a/drivers/staging/fbtft/fbtft-core.c
+++ b/drivers/staging/fbtft/fbtft-core.c
@@ -38,8 +38,7 @@ int fbtft_write_buf_dc(struct fbtft_par *par, void *buf, size_t len, int dc)
 {
    int ret;
-	if (par->gpio.dc)
-		gpiod_set_value(par->gpio.dc, dc);
+	gpiod_set_value(par->gpio.dc, dc);
ret = par->fbtftops.write(par, buf, len);
    if (ret < 0)
@@ -79,7 +78,7 @@ static int fbtft_request_one_gpio(struct fbtft_par *par,
    int ret = 0;
*gpiop = devm_gpiod_get_index_optional(dev, name, index,
-					       GPIOD_OUT_HIGH);
+					       GPIOD_OUT_LOW);
    if (IS_ERR(*gpiop)) {
    	ret = PTR_ERR(*gpiop);
    	dev_err(dev,
@@ -226,11 +225,15 @@ static void fbtft_reset(struct fbtft_par *par)
 {
    if (!par->gpio.reset)
    	return;
+
    fbtft_par_dbg(DEBUG_RESET, par, "%s()\n", __func__);
+
    gpiod_set_value_cansleep(par->gpio.reset, 1);
    usleep_range(20, 40);
    gpiod_set_value_cansleep(par->gpio.reset, 0);
    msleep(120);
+
+	gpiod_set_value_cansleep(par->gpio.cs, 1);  /* Activate chip */
 }
static void fbtft_update_display(struct fbtft_par *par, unsigned int start_line,
@@ -922,8 +925,6 @@ static int fbtft_init_display_from_property(struct fbtft_par *par)
    	goto out_free;
par->fbtftops.reset(par);
-	if (par->gpio.cs)
-		gpiod_set_value(par->gpio.cs, 0);  /* Activate chip */
index = -1;
    val = values[++index];
@@ -1018,8 +1019,6 @@ int fbtft_init_display(struct fbtft_par *par)
    }
par->fbtftops.reset(par);
-	if (par->gpio.cs)
-		gpiod_set_value(par->gpio.cs, 0);  /* Activate chip */
i = 0;
    while (i < FBTFT_MAX_INIT_SEQUENCE) {
diff --git a/drivers/staging/fbtft/fbtft-io.c b/drivers/staging/fbtft/fbtft-io.c
index 0863d257d762..de1904a443c2 100644
--- a/drivers/staging/fbtft/fbtft-io.c
+++ b/drivers/staging/fbtft/fbtft-io.c
@@ -142,12 +142,12 @@ int fbtft_write_gpio8_wr(struct fbtft_par *par, void *buf, size_t len)
    	data = *(u8 *)buf;
/* Start writing by pulling down /WR */
-		gpiod_set_value(par->gpio.wr, 0);
+		gpiod_set_value(par->gpio.wr, 1);
/* Set data */
 #ifndef DO_NOT_OPTIMIZE_FBTFT_WRITE_GPIO
    	if (data == prev_data) {
-			gpiod_set_value(par->gpio.wr, 0); /* used as delay */
+			gpiod_set_value(par->gpio.wr, 1); /* used as delay */
    	} else {
    		for (i = 0; i < 8; i++) {
    			if ((data & 1) != (prev_data & 1))
@@ -165,7 +165,7 @@ int fbtft_write_gpio8_wr(struct fbtft_par *par, void *buf, size_t len)
 #endif
/* Pullup /WR */
-		gpiod_set_value(par->gpio.wr, 1);
+		gpiod_set_value(par->gpio.wr, 0);
#ifndef DO_NOT_OPTIMIZE_FBTFT_WRITE_GPIO
    	prev_data = *(u8 *)buf;
@@ -192,12 +192,12 @@ int fbtft_write_gpio16_wr(struct fbtft_par *par, void *buf, size_t len)
    	data = *(u16 *)buf;
/* Start writing by pulling down /WR */
-		gpiod_set_value(par->gpio.wr, 0);
+		gpiod_set_value(par->gpio.wr, 1);
/* Set data */
 #ifndef DO_NOT_OPTIMIZE_FBTFT_WRITE_GPIO
    	if (data == prev_data) {
-			gpiod_set_value(par->gpio.wr, 0); /* used as delay */
+			gpiod_set_value(par->gpio.wr, 1); /* used as delay */
    	} else {
    		for (i = 0; i < 16; i++) {
    			if ((data & 1) != (prev_data & 1))
@@ -215,7 +215,7 @@ int fbtft_write_gpio16_wr(struct fbtft_par *par, void *buf, size_t len)
 #endif
/* Pullup /WR */
-		gpiod_set_value(par->gpio.wr, 1);
+		gpiod_set_value(par->gpio.wr, 0);
#ifndef DO_NOT_OPTIMIZE_FBTFT_WRITE_GPIO
    	prev_data = *(u16 *)buf;
-- 
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[PATCH v3 1/4] staging: fbtft: Rectify GPIO handling