[v2] Staging: fbtft: Fix GPIO handling
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Message ID 75ada52f-afa1-08bc-d0ce-966fc1110e70@jaseg.net
State New
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  • [v2] Staging: fbtft: Fix GPIO handling
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Commit Message

Jan Sebastian Götte July 17, 2019, 2:41 p.m. UTC
Commit c440eee1a7a1 ("Staging: fbtft: Switch to the gpio descriptor
interface") breaks GPIO handling. In several places, checks to only set
a GPIO if it was configured ended up backwards.
I have tested this fix. The fixed driver works with a ili9486
display connected to a raspberry pi via SPI.

Fixes: commit c440eee1a7a1d ("Staging: fbtft: Switch to the gpio descriptor interface")
Tested-by: Jan Sebastian Götte <linux@jaseg.net>
Reviewed-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Signed-off-by: Jan Sebastian Götte <linux@jaseg.net>
---
 drivers/staging/fbtft/fb_bd663474.c  | 2 +-
 drivers/staging/fbtft/fb_ili9163.c   | 2 +-
 drivers/staging/fbtft/fb_ili9325.c   | 2 +-
 drivers/staging/fbtft/fb_s6d1121.c   | 2 +-
 drivers/staging/fbtft/fb_ssd1289.c   | 2 +-
 drivers/staging/fbtft/fb_ssd1331.c   | 4 ++--
 drivers/staging/fbtft/fb_upd161704.c | 2 +-
 drivers/staging/fbtft/fbtft-bus.c    | 2 +-
 drivers/staging/fbtft/fbtft-core.c   | 4 ++--
 9 files changed, 11 insertions(+), 11 deletions(-)

Comments

Greg KH July 25, 2019, 7:21 a.m. UTC | #1
On Wed, Jul 17, 2019 at 11:41:37PM +0900, Jan Sebastian Götte wrote:
> Commit c440eee1a7a1 ("Staging: fbtft: Switch to the gpio descriptor
> interface") breaks GPIO handling. In several places, checks to only set
> a GPIO if it was configured ended up backwards.
> I have tested this fix. The fixed driver works with a ili9486
> display connected to a raspberry pi via SPI.
> 
> Fixes: commit c440eee1a7a1d ("Staging: fbtft: Switch to the gpio descriptor interface")
> Tested-by: Jan Sebastian Götte <linux@jaseg.net>
> Reviewed-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
> Signed-off-by: Jan Sebastian Götte <linux@jaseg.net>
> ---

Can this go on top of Phil's patches?  Or does it replace it?

I can't figure out what to do here, sorry.

thanks,

greg k-h
Nicolas Saenz Julienne July 25, 2019, 7:23 a.m. UTC | #2
On Thu, 2019-07-25 at 09:21 +0200, Greg KH wrote:
> On Wed, Jul 17, 2019 at 11:41:37PM +0900, Jan Sebastian Götte wrote:
> > Commit c440eee1a7a1 ("Staging: fbtft: Switch to the gpio descriptor
> > interface") breaks GPIO handling. In several places, checks to only set
> > a GPIO if it was configured ended up backwards.
> > I have tested this fix. The fixed driver works with a ili9486
> > display connected to a raspberry pi via SPI.
> > 
> > Fixes: commit c440eee1a7a1d ("Staging: fbtft: Switch to the gpio descriptor
> > interface")
> > Tested-by: Jan Sebastian Götte <linux@jaseg.net>
> > Reviewed-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
> > Signed-off-by: Jan Sebastian Götte <linux@jaseg.net>
> > ---
> 
> Can this go on top of Phil's patches?  Or does it replace it?

This is needed on top of Phil patches.

Regards,
Nicolas

Patch
diff mbox series

diff --git a/drivers/staging/fbtft/fb_bd663474.c b/drivers/staging/fbtft/fb_bd663474.c
index b6c6d66e4eb1..e2c7646588f8 100644
--- a/drivers/staging/fbtft/fb_bd663474.c
+++ b/drivers/staging/fbtft/fb_bd663474.c
@@ -24,7 +24,7 @@ 
 
 static int init_display(struct fbtft_par *par)
 {
-	if (!par->gpio.cs)
+	if (par->gpio.cs)
 		gpiod_set_value(par->gpio.cs, 0);  /* Activate chip */
 
 	par->fbtftops.reset(par);
diff --git a/drivers/staging/fbtft/fb_ili9163.c b/drivers/staging/fbtft/fb_ili9163.c
index d609a2b67db9..fd32376700e2 100644
--- a/drivers/staging/fbtft/fb_ili9163.c
+++ b/drivers/staging/fbtft/fb_ili9163.c
@@ -77,7 +77,7 @@  static int init_display(struct fbtft_par *par)
 {
 	par->fbtftops.reset(par);
 
-	if (!par->gpio.cs)
+	if (par->gpio.cs)
 		gpiod_set_value(par->gpio.cs, 0);  /* Activate chip */
 
 	write_reg(par, MIPI_DCS_SOFT_RESET); /* software reset */
diff --git a/drivers/staging/fbtft/fb_ili9325.c b/drivers/staging/fbtft/fb_ili9325.c
index b090e7ab6fdd..85e54a10ed72 100644
--- a/drivers/staging/fbtft/fb_ili9325.c
+++ b/drivers/staging/fbtft/fb_ili9325.c
@@ -85,7 +85,7 @@  static int init_display(struct fbtft_par *par)
 {
 	par->fbtftops.reset(par);
 
-	if (!par->gpio.cs)
+	if (par->gpio.cs)
 		gpiod_set_value(par->gpio.cs, 0);  /* Activate chip */
 
 	bt &= 0x07;
diff --git a/drivers/staging/fbtft/fb_s6d1121.c b/drivers/staging/fbtft/fb_s6d1121.c
index b3d0701880fe..5a129b1352cc 100644
--- a/drivers/staging/fbtft/fb_s6d1121.c
+++ b/drivers/staging/fbtft/fb_s6d1121.c
@@ -29,7 +29,7 @@  static int init_display(struct fbtft_par *par)
 {
 	par->fbtftops.reset(par);
 
-	if (!par->gpio.cs)
+	if (par->gpio.cs)
 		gpiod_set_value(par->gpio.cs, 0);  /* Activate chip */
 
 	/* Initialization sequence from Lib_UTFT */
diff --git a/drivers/staging/fbtft/fb_ssd1289.c b/drivers/staging/fbtft/fb_ssd1289.c
index bbf75f795234..88a5b6925901 100644
--- a/drivers/staging/fbtft/fb_ssd1289.c
+++ b/drivers/staging/fbtft/fb_ssd1289.c
@@ -28,7 +28,7 @@  static int init_display(struct fbtft_par *par)
 {
 	par->fbtftops.reset(par);
 
-	if (!par->gpio.cs)
+	if (par->gpio.cs)
 		gpiod_set_value(par->gpio.cs, 0);  /* Activate chip */
 
 	write_reg(par, 0x00, 0x0001);
diff --git a/drivers/staging/fbtft/fb_ssd1331.c b/drivers/staging/fbtft/fb_ssd1331.c
index 4cfe9f8535d0..37622c9462aa 100644
--- a/drivers/staging/fbtft/fb_ssd1331.c
+++ b/drivers/staging/fbtft/fb_ssd1331.c
@@ -81,7 +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)
+	if (par->gpio.dc)
 		gpiod_set_value(par->gpio.dc, 0);
 	ret = par->fbtftops.write(par, par->buf, sizeof(u8));
 	if (ret < 0) {
@@ -104,7 +104,7 @@  static void write_reg8_bus8(struct fbtft_par *par, int len, ...)
 			return;
 		}
 	}
-	if (!par->gpio.dc)
+	if (par->gpio.dc)
 		gpiod_set_value(par->gpio.dc, 1);
 	va_end(args);
 }
diff --git a/drivers/staging/fbtft/fb_upd161704.c b/drivers/staging/fbtft/fb_upd161704.c
index 564a38e34440..c77832ae5e5b 100644
--- a/drivers/staging/fbtft/fb_upd161704.c
+++ b/drivers/staging/fbtft/fb_upd161704.c
@@ -26,7 +26,7 @@  static int init_display(struct fbtft_par *par)
 {
 	par->fbtftops.reset(par);
 
-	if (!par->gpio.cs)
+	if (par->gpio.cs)
 		gpiod_set_value(par->gpio.cs, 0);  /* Activate chip */
 
 	/* Initialization sequence from Lib_UTFT */
diff --git a/drivers/staging/fbtft/fbtft-bus.c b/drivers/staging/fbtft/fbtft-bus.c
index 2ea814d0dca5..63c65dd67b17 100644
--- a/drivers/staging/fbtft/fbtft-bus.c
+++ b/drivers/staging/fbtft/fbtft-bus.c
@@ -135,7 +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)
+	if (par->gpio.dc)
 		gpiod_set_value(par->gpio.dc, 1);
 
 	/* non buffered write */
diff --git a/drivers/staging/fbtft/fbtft-core.c b/drivers/staging/fbtft/fbtft-core.c
index bc750250ccd6..5127de922f6a 100644
--- a/drivers/staging/fbtft/fbtft-core.c
+++ b/drivers/staging/fbtft/fbtft-core.c
@@ -916,7 +916,7 @@  static int fbtft_init_display_dt(struct fbtft_par *par)
 		return -EINVAL;
 
 	par->fbtftops.reset(par);
-	if (!par->gpio.cs)
+	if (par->gpio.cs)
 		gpiod_set_value(par->gpio.cs, 0);  /* Activate chip */
 
 	while (p) {
@@ -1007,7 +1007,7 @@  int fbtft_init_display(struct fbtft_par *par)
 	}
 
 	par->fbtftops.reset(par);
-	if (!par->gpio.cs)
+	if (par->gpio.cs)
 		gpiod_set_value(par->gpio.cs, 0);  /* Activate chip */
 
 	i = 0;