[PATCH v5 1/2] video: fbdev: pxafb: loosen the platform data bond

[PATCH v5 1/2] video: fbdev: pxafb: loosen the platform data bond

[Robert Jarzmik]

In order to prepare the transition to a mixed platform data and
device-tree initialization, remove all the platform data references all
over the driver.

Copy the platform data into the internal structure of the pxafb, and
only use this afterward.

Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
---
 drivers/video/fbdev/pxafb.c | 54 ++++++++++++++++++++++++++++-----------------
 drivers/video/fbdev/pxafb.h |  2 ++
 2 files changed, 36 insertions(+), 20 deletions(-)

diff --git a/drivers/video/fbdev/pxafb.c b/drivers/video/fbdev/pxafb.c
index 94813af97f09..ed4b1a5dc306 100644
--- a/drivers/video/fbdev/pxafb.c
+++ b/drivers/video/fbdev/pxafb.c
@@ -457,7 +457,7 @@ static int pxafb_adjust_timing(struct pxafb_info *fbi,
 static int pxafb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
 {
 	struct pxafb_info *fbi = container_of(info, struct pxafb_info, fb);
-	struct pxafb_mach_info *inf = dev_get_platdata(fbi->dev);
+	struct pxafb_mach_info *inf = fbi->inf;
 	int err;
 
 	if (inf->fixed_modes) {
@@ -1230,7 +1230,7 @@ static unsigned int __smart_timing(unsigned time_ns, unsigned long lcd_clk)
 static void setup_smart_timing(struct pxafb_info *fbi,
 				struct fb_var_screeninfo *var)
 {
-	struct pxafb_mach_info *inf = dev_get_platdata(fbi->dev);
+	struct pxafb_mach_info *inf = fbi->inf;
 	struct pxafb_mode_info *mode = &inf->modes[0];
 	unsigned long lclk = clk_get_rate(fbi->clk);
 	unsigned t1, t2, t3, t4;
@@ -1258,14 +1258,13 @@ static void setup_smart_timing(struct pxafb_info *fbi,
 static int pxafb_smart_thread(void *arg)
 {
 	struct pxafb_info *fbi = arg;
-	struct pxafb_mach_info *inf = dev_get_platdata(fbi->dev);
+	struct pxafb_mach_info *inf = fbi->inf;
 
 	if (!inf->smart_update) {
 		pr_err("%s: not properly initialized, thread terminated\n",
 				__func__);
 		return -EINVAL;
 	}
-	inf = dev_get_platdata(fbi->dev);
 
 	pr_debug("%s(): task starting\n", __func__);
 
@@ -1788,11 +1787,11 @@ decode_mode:
 		fbi->video_mem_size = video_mem_size;
 }
 
-static struct pxafb_info *pxafb_init_fbinfo(struct device *dev)
+static struct pxafb_info *pxafb_init_fbinfo(struct device *dev,
+					    struct pxafb_mach_info *inf)
 {
 	struct pxafb_info *fbi;
 	void *addr;
-	struct pxafb_mach_info *inf = dev_get_platdata(dev);
 
 	/* Alloc the pxafb_info and pseudo_palette in one step */
 	fbi = kmalloc(sizeof(struct pxafb_info) + sizeof(u32) * 16, GFP_KERNEL);
@@ -1801,6 +1800,7 @@ static struct pxafb_info *pxafb_init_fbinfo(struct device *dev)
 
 	memset(fbi, 0, sizeof(struct pxafb_info));
 	fbi->dev = dev;
+	fbi->inf = inf;
 
 	fbi->clk = clk_get(dev, NULL);
 	if (IS_ERR(fbi->clk)) {
@@ -1852,10 +1852,9 @@ static struct pxafb_info *pxafb_init_fbinfo(struct device *dev)
 }
 
 #ifdef CONFIG_FB_PXA_PARAMETERS
-static int parse_opt_mode(struct device *dev, const char *this_opt)
+static int parse_opt_mode(struct device *dev, const char *this_opt,
+			  struct pxafb_mach_info *inf)
 {
-	struct pxafb_mach_info *inf = dev_get_platdata(dev);
-
 	const char *name = this_opt+5;
 	unsigned int namelen = strlen(name);
 	int res_specified = 0, bpp_specified = 0;
@@ -1911,9 +1910,9 @@ done:
 	return 0;
 }
 
-static int parse_opt(struct device *dev, char *this_opt)
+static int parse_opt(struct device *dev, char *this_opt,
+		     struct pxafb_mach_info *inf)
 {
-	struct pxafb_mach_info *inf = dev_get_platdata(dev);
 	struct pxafb_mode_info *mode = &inf->modes[0];
 	char s[64];
 
@@ -1922,7 +1921,7 @@ static int parse_opt(struct device *dev, char *this_opt)
 	if (!strncmp(this_opt, "vmem:", 5)) {
 		video_mem_size = memparse(this_opt + 5, NULL);
 	} else if (!strncmp(this_opt, "mode:", 5)) {
-		return parse_opt_mode(dev, this_opt);
+		return parse_opt_mode(dev, this_opt, inf);
 	} else if (!strncmp(this_opt, "pixclock:", 9)) {
 		mode->pixclock = simple_strtoul(this_opt+9, NULL, 0);
 		sprintf(s, "pixclock: %ld\n", mode->pixclock);
@@ -2011,7 +2010,8 @@ static int parse_opt(struct device *dev, char *this_opt)
 	return 0;
 }
 
-static int pxafb_parse_options(struct device *dev, char *options)
+static int pxafb_parse_options(struct device *dev, char *options,
+			       struct pxafb_mach_info *inf)
 {
 	char *this_opt;
 	int ret;
@@ -2023,7 +2023,7 @@ static int pxafb_parse_options(struct device *dev, char *options)
 
 	/* could be made table driven or similar?... */
 	while ((this_opt = strsep(&options, ",")) != NULL) {
-		ret = parse_opt(dev, this_opt);
+		ret = parse_opt(dev, this_opt, inf);
 		if (ret)
 			return ret;
 	}
@@ -2095,19 +2095,33 @@ static void pxafb_check_options(struct device *dev, struct pxafb_mach_info *inf)
 static int pxafb_probe(struct platform_device *dev)
 {
 	struct pxafb_info *fbi;
-	struct pxafb_mach_info *inf;
+	struct pxafb_mach_info *inf, *pdata;
 	struct resource *r;
-	int irq, ret;
+	int i, irq, ret;
 
 	dev_dbg(&dev->dev, "pxafb_probe\n");
 
-	inf = dev_get_platdata(&dev->dev);
 	ret = -ENOMEM;
-	fbi = NULL;
+	pdata = dev_get_platdata(&dev->dev);
+	inf = devm_kmalloc(&dev->dev, sizeof(*inf), GFP_KERNEL);
 	if (!inf)
 		goto failed;
+	if (pdata) {
+		*inf = *pdata;
+		inf->modes =
+			devm_kmalloc_array(&dev->dev, pdata->num_modes,
+					   sizeof(inf->modes[0]), GFP_KERNEL);
+		if (!inf->modes)
+			goto failed;
+		for (i = 0; i < inf->num_modes; i++)
+			inf->modes[i] = pdata->modes[i];
+	}
+
+	fbi = NULL;
+	if (!pdata)
+		goto failed;
 
-	ret = pxafb_parse_options(&dev->dev, g_options);
+	ret = pxafb_parse_options(&dev->dev, g_options, inf);
 	if (ret < 0)
 		goto failed;
 
@@ -2125,7 +2139,7 @@ static int pxafb_probe(struct platform_device *dev)
 		goto failed;
 	}
 
-	fbi = pxafb_init_fbinfo(&dev->dev);
+	fbi = pxafb_init_fbinfo(&dev->dev, inf);
 	if (!fbi) {
 		/* only reason for pxafb_init_fbinfo to fail is kmalloc */
 		dev_err(&dev->dev, "Failed to initialize framebuffer device\n");
diff --git a/drivers/video/fbdev/pxafb.h b/drivers/video/fbdev/pxafb.h
index 26ba9fa3f737..5dc414e26fc8 100644
--- a/drivers/video/fbdev/pxafb.h
+++ b/drivers/video/fbdev/pxafb.h
@@ -167,6 +167,8 @@ struct pxafb_info {
 
 	void (*lcd_power)(int, struct fb_var_screeninfo *);
 	void (*backlight_power)(int);
+
+	struct pxafb_mach_info	*inf;
 };
 
 #define TO_INF(ptr,member) container_of(ptr,struct pxafb_info,member)
-- 
2.1.4

[PATCH v5 1/2] video: fbdev: pxafb: loosen the platform data bond

[Robert Jarzmik]

In order to prepare the transition to a mixed platform data and
device-tree initialization, remove all the platform data references all
over the driver.

Copy the platform data into the internal structure of the pxafb, and
only use this afterward.

Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
---
 drivers/video/fbdev/pxafb.c | 54 ++++++++++++++++++++++++++++-----------------
 drivers/video/fbdev/pxafb.h |  2 ++
 2 files changed, 36 insertions(+), 20 deletions(-)

diff --git a/drivers/video/fbdev/pxafb.c b/drivers/video/fbdev/pxafb.c
index 94813af97f09..ed4b1a5dc306 100644
--- a/drivers/video/fbdev/pxafb.c
+++ b/drivers/video/fbdev/pxafb.c
@@ -457,7 +457,7 @@ static int pxafb_adjust_timing(struct pxafb_info *fbi,
 static int pxafb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
 {
 	struct pxafb_info *fbi = container_of(info, struct pxafb_info, fb);
-	struct pxafb_mach_info *inf = dev_get_platdata(fbi->dev);
+	struct pxafb_mach_info *inf = fbi->inf;
 	int err;
 
 	if (inf->fixed_modes) {
@@ -1230,7 +1230,7 @@ static unsigned int __smart_timing(unsigned time_ns, unsigned long lcd_clk)
 static void setup_smart_timing(struct pxafb_info *fbi,
 				struct fb_var_screeninfo *var)
 {
-	struct pxafb_mach_info *inf = dev_get_platdata(fbi->dev);
+	struct pxafb_mach_info *inf = fbi->inf;
 	struct pxafb_mode_info *mode = &inf->modes[0];
 	unsigned long lclk = clk_get_rate(fbi->clk);
 	unsigned t1, t2, t3, t4;
@@ -1258,14 +1258,13 @@ static void setup_smart_timing(struct pxafb_info *fbi,
 static int pxafb_smart_thread(void *arg)
 {
 	struct pxafb_info *fbi = arg;
-	struct pxafb_mach_info *inf = dev_get_platdata(fbi->dev);
+	struct pxafb_mach_info *inf = fbi->inf;
 
 	if (!inf->smart_update) {
 		pr_err("%s: not properly initialized, thread terminated\n",
 				__func__);
 		return -EINVAL;
 	}
-	inf = dev_get_platdata(fbi->dev);
 
 	pr_debug("%s(): task starting\n", __func__);
 
@@ -1788,11 +1787,11 @@ decode_mode:
 		fbi->video_mem_size = video_mem_size;
 }
 
-static struct pxafb_info *pxafb_init_fbinfo(struct device *dev)
+static struct pxafb_info *pxafb_init_fbinfo(struct device *dev,
+					    struct pxafb_mach_info *inf)
 {
 	struct pxafb_info *fbi;
 	void *addr;
-	struct pxafb_mach_info *inf = dev_get_platdata(dev);
 
 	/* Alloc the pxafb_info and pseudo_palette in one step */
 	fbi = kmalloc(sizeof(struct pxafb_info) + sizeof(u32) * 16, GFP_KERNEL);
@@ -1801,6 +1800,7 @@ static struct pxafb_info *pxafb_init_fbinfo(struct device *dev)
 
 	memset(fbi, 0, sizeof(struct pxafb_info));
 	fbi->dev = dev;
+	fbi->inf = inf;
 
 	fbi->clk = clk_get(dev, NULL);
 	if (IS_ERR(fbi->clk)) {
@@ -1852,10 +1852,9 @@ static struct pxafb_info *pxafb_init_fbinfo(struct device *dev)
 }
 
 #ifdef CONFIG_FB_PXA_PARAMETERS
-static int parse_opt_mode(struct device *dev, const char *this_opt)
+static int parse_opt_mode(struct device *dev, const char *this_opt,
+			  struct pxafb_mach_info *inf)
 {
-	struct pxafb_mach_info *inf = dev_get_platdata(dev);
-
 	const char *name = this_opt+5;
 	unsigned int namelen = strlen(name);
 	int res_specified = 0, bpp_specified = 0;
@@ -1911,9 +1910,9 @@ done:
 	return 0;
 }
 
-static int parse_opt(struct device *dev, char *this_opt)
+static int parse_opt(struct device *dev, char *this_opt,
+		     struct pxafb_mach_info *inf)
 {
-	struct pxafb_mach_info *inf = dev_get_platdata(dev);
 	struct pxafb_mode_info *mode = &inf->modes[0];
 	char s[64];
 
@@ -1922,7 +1921,7 @@ static int parse_opt(struct device *dev, char *this_opt)
 	if (!strncmp(this_opt, "vmem:", 5)) {
 		video_mem_size = memparse(this_opt + 5, NULL);
 	} else if (!strncmp(this_opt, "mode:", 5)) {
-		return parse_opt_mode(dev, this_opt);
+		return parse_opt_mode(dev, this_opt, inf);
 	} else if (!strncmp(this_opt, "pixclock:", 9)) {
 		mode->pixclock = simple_strtoul(this_opt+9, NULL, 0);
 		sprintf(s, "pixclock: %ld\n", mode->pixclock);
@@ -2011,7 +2010,8 @@ static int parse_opt(struct device *dev, char *this_opt)
 	return 0;
 }
 
-static int pxafb_parse_options(struct device *dev, char *options)
+static int pxafb_parse_options(struct device *dev, char *options,
+			       struct pxafb_mach_info *inf)
 {
 	char *this_opt;
 	int ret;
@@ -2023,7 +2023,7 @@ static int pxafb_parse_options(struct device *dev, char *options)
 
 	/* could be made table driven or similar?... */
 	while ((this_opt = strsep(&options, ",")) != NULL) {
-		ret = parse_opt(dev, this_opt);
+		ret = parse_opt(dev, this_opt, inf);
 		if (ret)
 			return ret;
 	}
@@ -2095,19 +2095,33 @@ static void pxafb_check_options(struct device *dev, struct pxafb_mach_info *inf)
 static int pxafb_probe(struct platform_device *dev)
 {
 	struct pxafb_info *fbi;
-	struct pxafb_mach_info *inf;
+	struct pxafb_mach_info *inf, *pdata;
 	struct resource *r;
-	int irq, ret;
+	int i, irq, ret;
 
 	dev_dbg(&dev->dev, "pxafb_probe\n");
 
-	inf = dev_get_platdata(&dev->dev);
 	ret = -ENOMEM;
-	fbi = NULL;
+	pdata = dev_get_platdata(&dev->dev);
+	inf = devm_kmalloc(&dev->dev, sizeof(*inf), GFP_KERNEL);
 	if (!inf)
 		goto failed;
+	if (pdata) {
+		*inf = *pdata;
+		inf->modes +			devm_kmalloc_array(&dev->dev, pdata->num_modes,
+					   sizeof(inf->modes[0]), GFP_KERNEL);
+		if (!inf->modes)
+			goto failed;
+		for (i = 0; i < inf->num_modes; i++)
+			inf->modes[i] = pdata->modes[i];
+	}
+
+	fbi = NULL;
+	if (!pdata)
+		goto failed;
 
-	ret = pxafb_parse_options(&dev->dev, g_options);
+	ret = pxafb_parse_options(&dev->dev, g_options, inf);
 	if (ret < 0)
 		goto failed;
 
@@ -2125,7 +2139,7 @@ static int pxafb_probe(struct platform_device *dev)
 		goto failed;
 	}
 
-	fbi = pxafb_init_fbinfo(&dev->dev);
+	fbi = pxafb_init_fbinfo(&dev->dev, inf);
 	if (!fbi) {
 		/* only reason for pxafb_init_fbinfo to fail is kmalloc */
 		dev_err(&dev->dev, "Failed to initialize framebuffer device\n");
diff --git a/drivers/video/fbdev/pxafb.h b/drivers/video/fbdev/pxafb.h
index 26ba9fa3f737..5dc414e26fc8 100644
--- a/drivers/video/fbdev/pxafb.h
+++ b/drivers/video/fbdev/pxafb.h
@@ -167,6 +167,8 @@ struct pxafb_info {
 
 	void (*lcd_power)(int, struct fb_var_screeninfo *);
 	void (*backlight_power)(int);
+
+	struct pxafb_mach_info	*inf;
 };
 
 #define TO_INF(ptr,member) container_of(ptr,struct pxafb_info,member)
-- 
2.1.4

[PATCH v5 2/2] video: fbdev: pxafb: initial devicetree conversion

[Robert Jarzmik]

This patch brings a first support of pxa framebuffer devices to a
devicetree pxa platform, as was before platform data.

There are restrictions with this port, the biggest one being the lack of
support of smart panels. Moreover the conversion doesn't provide a way
to declare multiple framebuffer configurations with different bits per
pixel, only the LCD hardware bus width is used.

The patch was tested on both pxa25x, pxa27x and pxa3xx platform (namely
lubbock, mainstone and zylonite).

Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
---
Since v1: Philipp's review: of_graph usage
Since v3: of_device_id sentinel, and all compatible ids added
Since v4: fixed of_device_id table : rebase error on my side, with
          braces which were incorrectly added
---
 drivers/video/fbdev/Kconfig |   2 +
 drivers/video/fbdev/pxafb.c | 163 +++++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 162 insertions(+), 3 deletions(-)

diff --git a/drivers/video/fbdev/Kconfig b/drivers/video/fbdev/Kconfig
index e6d16d65e4e6..3160ff6bed24 100644
--- a/drivers/video/fbdev/Kconfig
+++ b/drivers/video/fbdev/Kconfig
@@ -1880,6 +1880,8 @@ config FB_PXA
 	select FB_CFB_FILLRECT
 	select FB_CFB_COPYAREA
 	select FB_CFB_IMAGEBLIT
+	select VIDEOMODE_HELPERS if OF
+	select FB_MODE_HELPERS if OF
 	---help---
 	  Frame buffer driver for the built-in LCD controller in the Intel
 	  PXA2x0 processor.
diff --git a/drivers/video/fbdev/pxafb.c b/drivers/video/fbdev/pxafb.c
index ed4b1a5dc306..9992ce0c651e 100644
--- a/drivers/video/fbdev/pxafb.c
+++ b/drivers/video/fbdev/pxafb.c
@@ -55,6 +55,9 @@
 #include <linux/kthread.h>
 #include <linux/freezer.h>
 #include <linux/console.h>
+#include <linux/of_graph.h>
+#include <video/of_display_timing.h>
+#include <video/videomode.h>
 
 #include <mach/hardware.h>
 #include <asm/io.h>
@@ -2092,6 +2095,151 @@ static void pxafb_check_options(struct device *dev, struct pxafb_mach_info *inf)
 #define pxafb_check_options(...)	do {} while (0)
 #endif
 
+#if defined(CONFIG_OF)
+static const char * const lcd_types[] = {
+	"unknown", "mono-stn", "mono-dstn", "color-stn", "color-dstn",
+	"color-tft", "smart-panel", NULL
+};
+
+static int of_get_pxafb_display(struct device *dev, struct device_node *disp,
+				struct pxafb_mach_info *info, u32 bus_width)
+{
+	struct display_timings *timings;
+	struct videomode vm;
+	int i, ret = -EINVAL;
+	const char *s;
+
+	ret = of_property_read_string(disp, "lcd-type", &s);
+	if (ret)
+		s = "color-tft";
+
+	for (i = 0; lcd_types[i]; i++)
+		if (!strcmp(s, lcd_types[i]))
+			break;
+	if (!i || !lcd_types[i]) {
+		dev_err(dev, "lcd-type %s is unknown\n", s);
+		return -EINVAL;
+	}
+	info->lcd_conn |= LCD_CONN_TYPE(i);
+	info->lcd_conn |= LCD_CONN_WIDTH(bus_width);
+
+	timings = of_get_display_timings(disp);
+	if (!timings)
+		goto out;
+
+	ret = -ENOMEM;
+	info->modes = kmalloc_array(timings->num_timings,
+				    sizeof(info->modes[0]), GFP_KERNEL);
+	if (!info->modes)
+		goto out;
+	info->num_modes = timings->num_timings;
+
+	for (i = 0; i < timings->num_timings; i++) {
+		ret = videomode_from_timings(timings, &vm, i);
+		if (ret) {
+			dev_err(dev, "videomode_from_timings %d failed: %d\n",
+				i, ret);
+			goto out;
+		}
+		if (vm.flags & DISPLAY_FLAGS_PIXDATA_POSEDGE)
+			info->lcd_conn |= LCD_PCLK_EDGE_RISE;
+		if (vm.flags & DISPLAY_FLAGS_PIXDATA_NEGEDGE)
+			info->lcd_conn |= LCD_PCLK_EDGE_FALL;
+		if (vm.flags & DISPLAY_FLAGS_DE_HIGH)
+			info->lcd_conn |= LCD_BIAS_ACTIVE_HIGH;
+		if (vm.flags & DISPLAY_FLAGS_DE_LOW)
+			info->lcd_conn |= LCD_BIAS_ACTIVE_LOW;
+		if (vm.flags & DISPLAY_FLAGS_HSYNC_HIGH)
+			info->modes[i].sync |= FB_SYNC_HOR_HIGH_ACT;
+		if (vm.flags & DISPLAY_FLAGS_VSYNC_HIGH)
+			info->modes[i].sync |= FB_SYNC_VERT_HIGH_ACT;
+
+		info->modes[i].pixclock = 1000000000UL / (vm.pixelclock / 1000);
+		info->modes[i].xres = vm.hactive;
+		info->modes[i].yres = vm.vactive;
+		info->modes[i].hsync_len = vm.hsync_len;
+		info->modes[i].left_margin = vm.hback_porch;
+		info->modes[i].right_margin = vm.hfront_porch;
+		info->modes[i].vsync_len = vm.vsync_len;
+		info->modes[i].upper_margin = vm.vback_porch;
+		info->modes[i].lower_margin = vm.vfront_porch;
+	}
+	ret = 0;
+
+out:
+	display_timings_release(timings);
+	return ret;
+}
+
+static int of_get_pxafb_mode_info(struct device *dev,
+				  struct pxafb_mach_info *info)
+{
+	struct device_node *display, *np;
+	u32 bus_width, depth = 0;
+	int ret, i;
+
+	of_property_read_u32(dev->of_node, "depth", &depth);
+	np = of_graph_get_next_endpoint(dev->of_node, NULL);
+	if (!np) {
+		dev_err(dev, "could not find endpoint\n");
+		return -EINVAL;
+	}
+	ret = of_property_read_u32(np, "bus-width", &bus_width);
+	if (ret) {
+		dev_err(dev, "no bus-width specified: %d\n", ret);
+		return ret;
+	}
+
+	display = of_graph_get_remote_port_parent(np);
+	of_node_put(np);
+	if (!display) {
+		dev_err(dev, "no display defined\n");
+		return -EINVAL;
+	}
+
+	ret = of_get_pxafb_display(dev, display, info, bus_width);
+	of_node_put(display);
+	if (ret)
+		return ret;
+
+	for (i = 0; i < info->num_modes; i++) {
+		info->modes[i].depth = depth;
+		info->modes[i].bpp = bus_width;
+	}
+
+	return 0;
+}
+
+static struct pxafb_mach_info *of_pxafb_of_mach_info(struct device *dev)
+{
+	int ret;
+	struct pxafb_mach_info *info;
+
+	if (!dev->of_node)
+		return NULL;
+	info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL);
+	if (!info)
+		return ERR_PTR(-ENOMEM);
+	ret = of_get_pxafb_mode_info(dev, info);
+	if (ret) {
+		kfree(info->modes);
+		return ERR_PTR(ret);
+	}
+
+	/*
+	 * On purpose, neither lccrX registers nor video memory size can be
+	 * specified through device-tree, they are considered more a debug hack
+	 * available through command line.
+	 */
+	return info;
+}
+#else
+static struct pxafb_mach_info *of_pxafb_of_mach_info(struct device *dev)
+{
+	return NULL;
+}
+#endif
+
 static int pxafb_probe(struct platform_device *dev)
 {
 	struct pxafb_info *fbi;
@@ -2104,8 +2252,7 @@ static int pxafb_probe(struct platform_device *dev)
 	ret = -ENOMEM;
 	pdata = dev_get_platdata(&dev->dev);
 	inf = devm_kmalloc(&dev->dev, sizeof(*inf), GFP_KERNEL);
-	if (!inf)
-		goto failed;
+
 	if (pdata) {
 		*inf = *pdata;
 		inf->modes =
@@ -2117,8 +2264,9 @@ static int pxafb_probe(struct platform_device *dev)
 			inf->modes[i] = pdata->modes[i];
 	}
 
-	fbi = NULL;
 	if (!pdata)
+		inf = of_pxafb_of_mach_info(&dev->dev);
+	if (IS_ERR_OR_NULL(inf))
 		goto failed;
 
 	ret = pxafb_parse_options(&dev->dev, g_options, inf);
@@ -2313,11 +2461,20 @@ static int pxafb_remove(struct platform_device *dev)
 	return 0;
 }
 
+static const struct of_device_id pxafb_of_dev_id[] = {
+	{ .compatible = "marvell,pxa270-lcdc", },
+	{ .compatible = "marvell,pxa300-lcdc", },
+	{ .compatible = "marvell,pxa2xx-lcdc", },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, pxafb_of_dev_id);
+
 static struct platform_driver pxafb_driver = {
 	.probe		= pxafb_probe,
 	.remove 	= pxafb_remove,
 	.driver		= {
 		.name	= "pxa2xx-fb",
+		.of_match_table = pxafb_of_dev_id,
 #ifdef CONFIG_PM
 		.pm	= &pxafb_pm_ops,
 #endif
-- 
2.1.4

[PATCH v5 2/2] video: fbdev: pxafb: initial devicetree conversion

[Robert Jarzmik]

This patch brings a first support of pxa framebuffer devices to a
devicetree pxa platform, as was before platform data.

There are restrictions with this port, the biggest one being the lack of
support of smart panels. Moreover the conversion doesn't provide a way
to declare multiple framebuffer configurations with different bits per
pixel, only the LCD hardware bus width is used.

The patch was tested on both pxa25x, pxa27x and pxa3xx platform (namely
lubbock, mainstone and zylonite).

Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
---
Since v1: Philipp's review: of_graph usage
Since v3: of_device_id sentinel, and all compatible ids added
Since v4: fixed of_device_id table : rebase error on my side, with
          braces which were incorrectly added
---
 drivers/video/fbdev/Kconfig |   2 +
 drivers/video/fbdev/pxafb.c | 163 +++++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 162 insertions(+), 3 deletions(-)

diff --git a/drivers/video/fbdev/Kconfig b/drivers/video/fbdev/Kconfig
index e6d16d65e4e6..3160ff6bed24 100644
--- a/drivers/video/fbdev/Kconfig
+++ b/drivers/video/fbdev/Kconfig
@@ -1880,6 +1880,8 @@ config FB_PXA
 	select FB_CFB_FILLRECT
 	select FB_CFB_COPYAREA
 	select FB_CFB_IMAGEBLIT
+	select VIDEOMODE_HELPERS if OF
+	select FB_MODE_HELPERS if OF
 	---help---
 	  Frame buffer driver for the built-in LCD controller in the Intel
 	  PXA2x0 processor.
diff --git a/drivers/video/fbdev/pxafb.c b/drivers/video/fbdev/pxafb.c
index ed4b1a5dc306..9992ce0c651e 100644
--- a/drivers/video/fbdev/pxafb.c
+++ b/drivers/video/fbdev/pxafb.c
@@ -55,6 +55,9 @@
 #include <linux/kthread.h>
 #include <linux/freezer.h>
 #include <linux/console.h>
+#include <linux/of_graph.h>
+#include <video/of_display_timing.h>
+#include <video/videomode.h>
 
 #include <mach/hardware.h>
 #include <asm/io.h>
@@ -2092,6 +2095,151 @@ static void pxafb_check_options(struct device *dev, struct pxafb_mach_info *inf)
 #define pxafb_check_options(...)	do {} while (0)
 #endif
 
+#if defined(CONFIG_OF)
+static const char * const lcd_types[] = {
+	"unknown", "mono-stn", "mono-dstn", "color-stn", "color-dstn",
+	"color-tft", "smart-panel", NULL
+};
+
+static int of_get_pxafb_display(struct device *dev, struct device_node *disp,
+				struct pxafb_mach_info *info, u32 bus_width)
+{
+	struct display_timings *timings;
+	struct videomode vm;
+	int i, ret = -EINVAL;
+	const char *s;
+
+	ret = of_property_read_string(disp, "lcd-type", &s);
+	if (ret)
+		s = "color-tft";
+
+	for (i = 0; lcd_types[i]; i++)
+		if (!strcmp(s, lcd_types[i]))
+			break;
+	if (!i || !lcd_types[i]) {
+		dev_err(dev, "lcd-type %s is unknown\n", s);
+		return -EINVAL;
+	}
+	info->lcd_conn |= LCD_CONN_TYPE(i);
+	info->lcd_conn |= LCD_CONN_WIDTH(bus_width);
+
+	timings = of_get_display_timings(disp);
+	if (!timings)
+		goto out;
+
+	ret = -ENOMEM;
+	info->modes = kmalloc_array(timings->num_timings,
+				    sizeof(info->modes[0]), GFP_KERNEL);
+	if (!info->modes)
+		goto out;
+	info->num_modes = timings->num_timings;
+
+	for (i = 0; i < timings->num_timings; i++) {
+		ret = videomode_from_timings(timings, &vm, i);
+		if (ret) {
+			dev_err(dev, "videomode_from_timings %d failed: %d\n",
+				i, ret);
+			goto out;
+		}
+		if (vm.flags & DISPLAY_FLAGS_PIXDATA_POSEDGE)
+			info->lcd_conn |= LCD_PCLK_EDGE_RISE;
+		if (vm.flags & DISPLAY_FLAGS_PIXDATA_NEGEDGE)
+			info->lcd_conn |= LCD_PCLK_EDGE_FALL;
+		if (vm.flags & DISPLAY_FLAGS_DE_HIGH)
+			info->lcd_conn |= LCD_BIAS_ACTIVE_HIGH;
+		if (vm.flags & DISPLAY_FLAGS_DE_LOW)
+			info->lcd_conn |= LCD_BIAS_ACTIVE_LOW;
+		if (vm.flags & DISPLAY_FLAGS_HSYNC_HIGH)
+			info->modes[i].sync |= FB_SYNC_HOR_HIGH_ACT;
+		if (vm.flags & DISPLAY_FLAGS_VSYNC_HIGH)
+			info->modes[i].sync |= FB_SYNC_VERT_HIGH_ACT;
+
+		info->modes[i].pixclock = 1000000000UL / (vm.pixelclock / 1000);
+		info->modes[i].xres = vm.hactive;
+		info->modes[i].yres = vm.vactive;
+		info->modes[i].hsync_len = vm.hsync_len;
+		info->modes[i].left_margin = vm.hback_porch;
+		info->modes[i].right_margin = vm.hfront_porch;
+		info->modes[i].vsync_len = vm.vsync_len;
+		info->modes[i].upper_margin = vm.vback_porch;
+		info->modes[i].lower_margin = vm.vfront_porch;
+	}
+	ret = 0;
+
+out:
+	display_timings_release(timings);
+	return ret;
+}
+
+static int of_get_pxafb_mode_info(struct device *dev,
+				  struct pxafb_mach_info *info)
+{
+	struct device_node *display, *np;
+	u32 bus_width, depth = 0;
+	int ret, i;
+
+	of_property_read_u32(dev->of_node, "depth", &depth);
+	np = of_graph_get_next_endpoint(dev->of_node, NULL);
+	if (!np) {
+		dev_err(dev, "could not find endpoint\n");
+		return -EINVAL;
+	}
+	ret = of_property_read_u32(np, "bus-width", &bus_width);
+	if (ret) {
+		dev_err(dev, "no bus-width specified: %d\n", ret);
+		return ret;
+	}
+
+	display = of_graph_get_remote_port_parent(np);
+	of_node_put(np);
+	if (!display) {
+		dev_err(dev, "no display defined\n");
+		return -EINVAL;
+	}
+
+	ret = of_get_pxafb_display(dev, display, info, bus_width);
+	of_node_put(display);
+	if (ret)
+		return ret;
+
+	for (i = 0; i < info->num_modes; i++) {
+		info->modes[i].depth = depth;
+		info->modes[i].bpp = bus_width;
+	}
+
+	return 0;
+}
+
+static struct pxafb_mach_info *of_pxafb_of_mach_info(struct device *dev)
+{
+	int ret;
+	struct pxafb_mach_info *info;
+
+	if (!dev->of_node)
+		return NULL;
+	info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL);
+	if (!info)
+		return ERR_PTR(-ENOMEM);
+	ret = of_get_pxafb_mode_info(dev, info);
+	if (ret) {
+		kfree(info->modes);
+		return ERR_PTR(ret);
+	}
+
+	/*
+	 * On purpose, neither lccrX registers nor video memory size can be
+	 * specified through device-tree, they are considered more a debug hack
+	 * available through command line.
+	 */
+	return info;
+}
+#else
+static struct pxafb_mach_info *of_pxafb_of_mach_info(struct device *dev)
+{
+	return NULL;
+}
+#endif
+
 static int pxafb_probe(struct platform_device *dev)
 {
 	struct pxafb_info *fbi;
@@ -2104,8 +2252,7 @@ static int pxafb_probe(struct platform_device *dev)
 	ret = -ENOMEM;
 	pdata = dev_get_platdata(&dev->dev);
 	inf = devm_kmalloc(&dev->dev, sizeof(*inf), GFP_KERNEL);
-	if (!inf)
-		goto failed;
+
 	if (pdata) {
 		*inf = *pdata;
 		inf->modes @@ -2117,8 +2264,9 @@ static int pxafb_probe(struct platform_device *dev)
 			inf->modes[i] = pdata->modes[i];
 	}
 
-	fbi = NULL;
 	if (!pdata)
+		inf = of_pxafb_of_mach_info(&dev->dev);
+	if (IS_ERR_OR_NULL(inf))
 		goto failed;
 
 	ret = pxafb_parse_options(&dev->dev, g_options, inf);
@@ -2313,11 +2461,20 @@ static int pxafb_remove(struct platform_device *dev)
 	return 0;
 }
 
+static const struct of_device_id pxafb_of_dev_id[] = {
+	{ .compatible = "marvell,pxa270-lcdc", },
+	{ .compatible = "marvell,pxa300-lcdc", },
+	{ .compatible = "marvell,pxa2xx-lcdc", },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, pxafb_of_dev_id);
+
 static struct platform_driver pxafb_driver = {
 	.probe		= pxafb_probe,
 	.remove 	= pxafb_remove,
 	.driver		= {
 		.name	= "pxa2xx-fb",
+		.of_match_table = pxafb_of_dev_id,
 #ifdef CONFIG_PM
 		.pm	= &pxafb_pm_ops,
 #endif
-- 
2.1.4

Re: [PATCH v5 2/2] video: fbdev: pxafb: initial devicetree conversion

[Tomi Valkeinen]

[-- Attachment #1: Type: text/plain, Size: 1322 bytes --]


On 17/11/15 22:32, Robert Jarzmik wrote:
> This patch brings a first support of pxa framebuffer devices to a
> devicetree pxa platform, as was before platform data.
> 
> There are restrictions with this port, the biggest one being the lack of
> support of smart panels. Moreover the conversion doesn't provide a way
> to declare multiple framebuffer configurations with different bits per
> pixel, only the LCD hardware bus width is used.
> 
> The patch was tested on both pxa25x, pxa27x and pxa3xx platform (namely
> lubbock, mainstone and zylonite).
> 
> Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
> ---
> Since v1: Philipp's review: of_graph usage
> Since v3: of_device_id sentinel, and all compatible ids added
> Since v4: fixed of_device_id table : rebase error on my side, with
>           braces which were incorrectly added
> ---
>  drivers/video/fbdev/Kconfig |   2 +
>  drivers/video/fbdev/pxafb.c | 163 +++++++++++++++++++++++++++++++++++++++++++-
>  2 files changed, 162 insertions(+), 3 deletions(-)

I see we already have
Documentation/devicetree/bindings/display/marvell,pxa2xx-lcdc.txt in the
mainline. I think the patch adding the binding doc should have been kept
in this series.

It seems that at least "depth" is missing from the binding document.

 Tomi


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Re: [PATCH v5 2/2] video: fbdev: pxafb: initial devicetree conversion

[Tomi Valkeinen]

[-- Attachment #1: Type: text/plain, Size: 1322 bytes --]


On 17/11/15 22:32, Robert Jarzmik wrote:
> This patch brings a first support of pxa framebuffer devices to a
> devicetree pxa platform, as was before platform data.
> 
> There are restrictions with this port, the biggest one being the lack of
> support of smart panels. Moreover the conversion doesn't provide a way
> to declare multiple framebuffer configurations with different bits per
> pixel, only the LCD hardware bus width is used.
> 
> The patch was tested on both pxa25x, pxa27x and pxa3xx platform (namely
> lubbock, mainstone and zylonite).
> 
> Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
> ---
> Since v1: Philipp's review: of_graph usage
> Since v3: of_device_id sentinel, and all compatible ids added
> Since v4: fixed of_device_id table : rebase error on my side, with
>           braces which were incorrectly added
> ---
>  drivers/video/fbdev/Kconfig |   2 +
>  drivers/video/fbdev/pxafb.c | 163 +++++++++++++++++++++++++++++++++++++++++++-
>  2 files changed, 162 insertions(+), 3 deletions(-)

I see we already have
Documentation/devicetree/bindings/display/marvell,pxa2xx-lcdc.txt in the
mainline. I think the patch adding the binding doc should have been kept
in this series.

It seems that at least "depth" is missing from the binding document.

 Tomi


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Re: [PATCH v5 2/2] video: fbdev: pxafb: initial devicetree conversion

[Robert Jarzmik]

Tomi Valkeinen <tomi.valkeinen@ti.com> writes:

> On 17/11/15 22:32, Robert Jarzmik wrote:
>> This patch brings a first support of pxa framebuffer devices to a
>> devicetree pxa platform, as was before platform data.
>> 
>> There are restrictions with this port, the biggest one being the lack of
>> support of smart panels. Moreover the conversion doesn't provide a way
>> to declare multiple framebuffer configurations with different bits per
>> pixel, only the LCD hardware bus width is used.
>> 
>> The patch was tested on both pxa25x, pxa27x and pxa3xx platform (namely
>> lubbock, mainstone and zylonite).
>> 
>> Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
>> ---
>> Since v1: Philipp's review: of_graph usage
>> Since v3: of_device_id sentinel, and all compatible ids added
>> Since v4: fixed of_device_id table : rebase error on my side, with
>>           braces which were incorrectly added
>> ---
>>  drivers/video/fbdev/Kconfig |   2 +
>>  drivers/video/fbdev/pxafb.c | 163 +++++++++++++++++++++++++++++++++++++++++++-
>>  2 files changed, 162 insertions(+), 3 deletions(-)
>
> I see we already have
> Documentation/devicetree/bindings/display/marvell,pxa2xx-lcdc.txt in the
> mainline. I think the patch adding the binding doc should have been kept
> in this series.
Ah, I think Rob took it through his tree already. Probably my fault also, I hope
I had not forgotten to Cc: you on the binding patch ...

> It seems that at least "depth" is missing from the binding document.
You're right.

Actually depth is not a "hardware" caracteristic. Moreover it's just used as an
overlay for pxafb_set_pixfmt() to superseed var->bits_per_pixel. I'm wondering
if the right path for of_get_pxafb_mode_info() would be to remove completely
depth, and leave it initialized at 0 for the DT case.

What do you think of this approach ? The other one would be to modify the
binding, and yet I feel this depth doesn't belong to the binding, it's my patch
which requires another spin IMHO.

Cheers.

-- 
Robert

Re: [PATCH v5 2/2] video: fbdev: pxafb: initial devicetree conversion

[Robert Jarzmik]

Tomi Valkeinen <tomi.valkeinen@ti.com> writes:

> On 17/11/15 22:32, Robert Jarzmik wrote:
>> This patch brings a first support of pxa framebuffer devices to a
>> devicetree pxa platform, as was before platform data.
>> 
>> There are restrictions with this port, the biggest one being the lack of
>> support of smart panels. Moreover the conversion doesn't provide a way
>> to declare multiple framebuffer configurations with different bits per
>> pixel, only the LCD hardware bus width is used.
>> 
>> The patch was tested on both pxa25x, pxa27x and pxa3xx platform (namely
>> lubbock, mainstone and zylonite).
>> 
>> Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
>> ---
>> Since v1: Philipp's review: of_graph usage
>> Since v3: of_device_id sentinel, and all compatible ids added
>> Since v4: fixed of_device_id table : rebase error on my side, with
>>           braces which were incorrectly added
>> ---
>>  drivers/video/fbdev/Kconfig |   2 +
>>  drivers/video/fbdev/pxafb.c | 163 +++++++++++++++++++++++++++++++++++++++++++-
>>  2 files changed, 162 insertions(+), 3 deletions(-)
>
> I see we already have
> Documentation/devicetree/bindings/display/marvell,pxa2xx-lcdc.txt in the
> mainline. I think the patch adding the binding doc should have been kept
> in this series.
Ah, I think Rob took it through his tree already. Probably my fault also, I hope
I had not forgotten to Cc: you on the binding patch ...

> It seems that at least "depth" is missing from the binding document.
You're right.

Actually depth is not a "hardware" caracteristic. Moreover it's just used as an
overlay for pxafb_set_pixfmt() to superseed var->bits_per_pixel. I'm wondering
if the right path for of_get_pxafb_mode_info() would be to remove completely
depth, and leave it initialized at 0 for the DT case.

What do you think of this approach ? The other one would be to modify the
binding, and yet I feel this depth doesn't belong to the binding, it's my patch
which requires another spin IMHO.

Cheers.

-- 
Robert

Re: [PATCH v5 2/2] video: fbdev: pxafb: initial devicetree conversion

[Tomi Valkeinen]

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On 07/12/15 22:50, Robert Jarzmik wrote:

>> It seems that at least "depth" is missing from the binding document.
> You're right.
> 
> Actually depth is not a "hardware" caracteristic. Moreover it's just used as an
> overlay for pxafb_set_pixfmt() to superseed var->bits_per_pixel. I'm wondering
> if the right path for of_get_pxafb_mode_info() would be to remove completely
> depth, and leave it initialized at 0 for the DT case.
> 
> What do you think of this approach ? The other one would be to modify the
> binding, and yet I feel this depth doesn't belong to the binding, it's my patch
> which requires another spin IMHO.

Yes, we should avoid non-hardware relate properties in the .dts files if
at all possible. If the driver works fine without the property, I think
it's fine to remove it. If it is required it needs to be added to the
binding document.

 Tomi


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Re: [PATCH v5 2/2] video: fbdev: pxafb: initial devicetree conversion

[Tomi Valkeinen]

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On 07/12/15 22:50, Robert Jarzmik wrote:

>> It seems that at least "depth" is missing from the binding document.
> You're right.
> 
> Actually depth is not a "hardware" caracteristic. Moreover it's just used as an
> overlay for pxafb_set_pixfmt() to superseed var->bits_per_pixel. I'm wondering
> if the right path for of_get_pxafb_mode_info() would be to remove completely
> depth, and leave it initialized at 0 for the DT case.
> 
> What do you think of this approach ? The other one would be to modify the
> binding, and yet I feel this depth doesn't belong to the binding, it's my patch
> which requires another spin IMHO.

Yes, we should avoid non-hardware relate properties in the .dts files if
at all possible. If the driver works fine without the property, I think
it's fine to remove it. If it is required it needs to be added to the
binding document.

 Tomi


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Re: [PATCH v5 2/2] video: fbdev: pxafb: initial devicetree conversion

[Robert Jarzmik]

Tomi Valkeinen <tomi.valkeinen@ti.com> writes:

> On 07/12/15 22:50, Robert Jarzmik wrote:
>
>>> It seems that at least "depth" is missing from the binding document.
>> You're right.
>> 
>> Actually depth is not a "hardware" caracteristic. Moreover it's just used as an
>> overlay for pxafb_set_pixfmt() to superseed var->bits_per_pixel. I'm wondering
>> if the right path for of_get_pxafb_mode_info() would be to remove completely
>> depth, and leave it initialized at 0 for the DT case.
>> 
>> What do you think of this approach ? The other one would be to modify the
>> binding, and yet I feel this depth doesn't belong to the binding, it's my patch
>> which requires another spin IMHO.
>
> Yes, we should avoid non-hardware relate properties in the .dts files if
> at all possible. If the driver works fine without the property, I think
> it's fine to remove it. If it is required it needs to be added to the
> binding document.

Ok, agreed Tomi. That commits me for a v6, as the driver works fine on my
tests. I'll send it in the next couple of days.

Thanks for the review.

-- 
Robert

Re: [PATCH v5 2/2] video: fbdev: pxafb: initial devicetree conversion

[Robert Jarzmik]

Tomi Valkeinen <tomi.valkeinen@ti.com> writes:

> On 07/12/15 22:50, Robert Jarzmik wrote:
>
>>> It seems that at least "depth" is missing from the binding document.
>> You're right.
>> 
>> Actually depth is not a "hardware" caracteristic. Moreover it's just used as an
>> overlay for pxafb_set_pixfmt() to superseed var->bits_per_pixel. I'm wondering
>> if the right path for of_get_pxafb_mode_info() would be to remove completely
>> depth, and leave it initialized at 0 for the DT case.
>> 
>> What do you think of this approach ? The other one would be to modify the
>> binding, and yet I feel this depth doesn't belong to the binding, it's my patch
>> which requires another spin IMHO.
>
> Yes, we should avoid non-hardware relate properties in the .dts files if
> at all possible. If the driver works fine without the property, I think
> it's fine to remove it. If it is required it needs to be added to the
> binding document.

Ok, agreed Tomi. That commits me for a v6, as the driver works fine on my
tests. I'll send it in the next couple of days.

Thanks for the review.

-- 
Robert