Am Montag, 26. Mai 2014, 12:14:43 schrieb Thierry Reding: > On Wed, May 21, 2014 at 01:42:56PM +0900, YoungJun Cho wrote: > > This patch is based on videomode and display_timing relevant codes. > > To support command mode panel, it does not need to guide its timing > > information to the display controller like video mode panel, > > but it requires signal timings to transfer video data. > > So this patch adds cmdmode struct, cmdmode_display_timing struct and > > the according helper functions to convert cmdmode_display_timing > > to a generic cmdmode. > > > > Signed-off-by: YoungJun Cho <yj44.cho@xxxxxxxxxxx> > > Acked-by: Inki Dae <inki.dae@xxxxxxxxxxx> > > Acked-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx> > > --- > > > > drivers/video/Kconfig | 3 + > > drivers/video/Makefile | 2 + > > drivers/video/cmdmode.c | 42 ++++++ > > drivers/video/cmdmode_display_timing.c | 26 ++++ > > drivers/video/of_cmdmode.c | 55 ++++++++ > > drivers/video/of_cmdmode_display_timing.c | 212 > > +++++++++++++++++++++++++++++ include/video/cmdmode.h > > | 67 +++++++++ > > include/video/cmdmode_display_timing.h | 59 ++++++++ > > include/video/of_cmdmode.h | 19 +++ > > include/video/of_cmdmode_display_timing.h | 26 ++++ > > 10 files changed, 511 insertions(+) > > create mode 100644 drivers/video/cmdmode.c > > create mode 100644 drivers/video/cmdmode_display_timing.c > > create mode 100644 drivers/video/of_cmdmode.c > > create mode 100644 drivers/video/of_cmdmode_display_timing.c > > create mode 100644 include/video/cmdmode.h > > create mode 100644 include/video/cmdmode_display_timing.h > > create mode 100644 include/video/of_cmdmode.h > > create mode 100644 include/video/of_cmdmode_display_timing.h > > Cc'ing Heiko Stübner on this. Heiko, you seem to have done some work on > i80 in the past[0] and I'm wondering if you could share any insights you > may have here. > > In particular I'd like your take on the approach taken in this patch to > describe i80 parameters to a generic command-mode display timings > structure. However it seems to me that these timings are really very i80 > specific and don't apply in general to command-mode displays. > > As such I'm beginning to think that this should rather be a property of > the attached display/panel rather than the interface that generates the > signal. OMG ... your digging in my ancient history :-D I always got the impression, i80 is somehow related to the MIPI-DBI protocol [1]. Also the display I was working on (AUO-K190x epaper controller) used the command mode to also transfer the display region to update and had a completely dfferent command set [2]. In the end, I temporarily settled in adding a glue driver, driving the s3c2416 i80 controller [3]. But someday I'd like to integrate this into a real solution, as the s3c2416 lcd-controller can do the i80 also in hardware, maybe speeding things up a little. So I guess the transfer method itself is generic, but the commands used seem to differ. But I of course don't know if "regular" MIPI-DBI/i80 displays use a command set of commands for their timings. Heiko [1] https://www.mail-archive.com/linux-samsung-soc@xxxxxxxxxxxxxxx/msg29100.html [2] https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/drivers/video/fbdev/auo_k190x.h [3] https://github.com/mmind/linux-es600/blob/topic/es600-devel/drivers/video/es600-epd.c > > diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig > > index c7b4f0f..7090ee5 100644 > > --- a/drivers/video/Kconfig > > +++ b/drivers/video/Kconfig > > @@ -38,6 +38,9 @@ config VGASTATE > > > > config VIDEOMODE_HELPERS > > > > bool > > > > +config CMDMODE_HELPERS > > + bool > > + > > > > config HDMI > > > > bool > > > > diff --git a/drivers/video/Makefile b/drivers/video/Makefile > > index 9ad3c17..619dd99 100644 > > --- a/drivers/video/Makefile > > +++ b/drivers/video/Makefile > > @@ -8,6 +8,8 @@ obj-y += backlight/ > > > > obj-y += fbdev/ > > > > obj-$(CONFIG_VIDEOMODE_HELPERS) += display_timing.o videomode.o > > > > +obj-$(CONFIG_CMDMODE_HELPERS) += cmdmode_display_timing.o cmdmode.o > > > > ifeq ($(CONFIG_OF),y) > > obj-$(CONFIG_VIDEOMODE_HELPERS) += of_display_timing.o of_videomode.o > > > > +obj-$(CONFIG_CMDMODE_HELPERS) += of_cmdmode_display_timing.o of_cmdmode.o > > > > endif > > > > diff --git a/drivers/video/cmdmode.c b/drivers/video/cmdmode.c > > new file mode 100644 > > index 0000000..3d3eeb8 > > --- /dev/null > > +++ b/drivers/video/cmdmode.c > > @@ -0,0 +1,42 @@ > > +/* > > + * generic cmdmode display timing functions > > + * > > + * Copyright (c) 2014 YoungJun Cho <yj44.cho@xxxxxxxxxxx> > > + * > > + * This program is free software; you can redistribute it and/or modify > > + * it under the terms of the GNU General Public License version 2 as > > + * published by the Free Software Foundation. > > + */ > > + > > +#include <linux/errno.h> > > +#include <linux/export.h> > > +#include <video/cmdmode_display_timing.h> > > +#include <video/cmdmode.h> > > + > > +void cmdmode_from_timing(const struct cmdmode_display_timing *cmdt, > > + struct cmdmode *cm) > > +{ > > + cm->pixelclock = cmdt->pixelclock; > > + cm->hactive = cmdt->hactive; > > + cm->vactive = cmdt->vactive; > > + cm->cs_setup = cmdt->cs_setup; > > + cm->wr_setup = cmdt->wr_setup; > > + cm->wr_active = cmdt->wr_active; > > + cm->wr_hold = cmdt->wr_hold; > > +} > > +EXPORT_SYMBOL_GPL(cmdmode_from_timing); > > + > > +int cmdmode_from_timings(const struct cmdmode_display_timings *cmdts, > > + struct cmdmode *cm, unsigned int index) > > +{ > > + struct cmdmode_display_timing *cmdt; > > + > > + cmdt = cmdmode_display_timings_get(cmdts, index); > > + if (!cmdt) > > + return -EINVAL; > > + > > + cmdmode_from_timing(cmdt, cm); > > + > > + return 0; > > +} > > +EXPORT_SYMBOL_GPL(cmdmode_from_timings); > > diff --git a/drivers/video/cmdmode_display_timing.c > > b/drivers/video/cmdmode_display_timing.c new file mode 100644 > > index 0000000..88bab08 > > --- /dev/null > > +++ b/drivers/video/cmdmode_display_timing.c > > @@ -0,0 +1,26 @@ > > +/* > > + * generic cmdmode display timing functions > > + * > > + * Copyright (c) 2014 YoungJun Cho <yj44.cho@xxxxxxxxxxx> > > + * > > + * This program is free software; you can redistribute it and/or modify > > + * it under the terms of the GNU General Public License version 2 as > > + * published by the Free Software Foundation. > > + */ > > + > > +#include <linux/export.h> > > +#include <linux/slab.h> > > +#include <video/cmdmode_display_timing.h> > > + > > +void cmdmode_display_timings_release(struct cmdmode_display_timings > > *cmdts) +{ > > + if (cmdts->timings) { > > + unsigned int i; > > + > > + for (i = 0; i < cmdts->num_timings; i++) > > + kfree(cmdts->timings[i]); > > + kfree(cmdts->timings); > > + } > > + kfree(cmdts); > > +} > > +EXPORT_SYMBOL_GPL(cmdmode_display_timings_release); > > diff --git a/drivers/video/of_cmdmode.c b/drivers/video/of_cmdmode.c > > new file mode 100644 > > index 0000000..d63294e > > --- /dev/null > > +++ b/drivers/video/of_cmdmode.c > > @@ -0,0 +1,55 @@ > > +/* > > + * generic cmdmode helper > > + * > > + * Copyright (c) 2014 YoungJun Cho <yj44.cho@xxxxxxxxxxx> > > + * > > + * This program is free software; you can redistribute it and/or modify > > + * it under the terms of the GNU General Public License version 2 as > > + * published by the Free Software Foundation. > > + */ > > +#include <linux/errno.h> > > +#include <linux/export.h> > > +#include <linux/of.h> > > +#include <video/cmdmode_display_timing.h> > > +#include <video/of_cmdmode_display_timing.h> > > +#include <video/of_cmdmode.h> > > +#include <video/cmdmode.h> > > + > > +/** > > + * of_get_cmdmode - get the cmdmode #<index> from devicetree > > + * @np - devicenode with the cmdmode_display_timings > > + * @cm - set to return value > > + * @index - index into list of cmdmode_display_timings > > + * (Set this to OF_USE_CMDMODE_NATIVE_MODE to use whatever mode is > > + * specified as native mode in the DT.) > > + * > > + * DESCRIPTION: > > + * Get a list of all display timings and put the one > > + * specified by index into *cm. This function should only be used, if > > + * only one cmdmode is to be retrieved. A driver that needs to work > > + * with multiple/all cmdmodes should work with > > + * of_get_cmdmode_display_timings instead. > > + **/ > > +int of_get_cmdmode(struct device_node *np, struct cmdmode *cm, int index) > > +{ > > + struct cmdmode_display_timings *cmdts; > > + int ret; > > + > > + cmdts = of_get_cmdmode_display_timings(np); > > + if (!cmdts) { > > + pr_err("%s: no timings specified\n", of_node_full_name(np)); > > + return -EINVAL; > > + } > > + > > + if (index == OF_USE_CMDMODE_NATIVE_MODE) > > + index = cmdts->native_mode; > > + > > + ret = cmdmode_from_timings(cmdts, cm, index); > > + if (ret) > > + return ret; > > + > > + cmdmode_display_timings_release(cmdts); > > + > > + return 0; > > +} > > +EXPORT_SYMBOL_GPL(of_get_cmdmode); > > diff --git a/drivers/video/of_cmdmode_display_timing.c > > b/drivers/video/of_cmdmode_display_timing.c new file mode 100644 > > index 0000000..fcf2b35 > > --- /dev/null > > +++ b/drivers/video/of_cmdmode_display_timing.c > > @@ -0,0 +1,212 @@ > > +/* > > + * OF helpers for parsing cmdmode display timings > > + * > > + * Copyright (c) 2014 YoungJun Cho <yj44.cho@xxxxxxxxxxx> > > + * > > + * based on of_cmdmode.c > > + * > > + * This program is free software; you can redistribute it and/or modify > > + * it under the terms of the GNU General Public License version 2 as > > + * published by the Free Software Foundation. > > + */ > > +#include <linux/export.h> > > +#include <linux/of.h> > > +#include <linux/slab.h> > > +#include <video/cmdmode_display_timing.h> > > +#include <video/of_cmdmode_display_timing.h> > > + > > +/** > > + * of_parse_cmdmode_display_timing - parse cmdmode_display_timing entry > > + * from device_node > > + * @np: device_node with the properties > > + **/ > > +static int of_parse_cmdmode_display_timing(const struct device_node *np, > > + struct cmdmode_display_timing *cmdt) > > +{ > > + int ret = 0; > > + > > + memset(cmdt, 0, sizeof(*cmdt)); > > + > > + ret |= of_property_read_u32(np, "clock-frequency", &cmdt- >pixelclock); > > + ret |= of_property_read_u32(np, "hactive", &cmdt->hactive); > > + ret |= of_property_read_u32(np, "vactive", &cmdt->vactive); > > + ret |= of_property_read_u32(np, "cs-setup", &cmdt->cs_setup); > > + ret |= of_property_read_u32(np, "wr-setup", &cmdt->wr_setup); > > + ret |= of_property_read_u32(np, "wr-active", &cmdt->wr_active); > > + ret |= of_property_read_u32(np, "wr-hold", &cmdt->wr_hold); > > + > > + if (ret) { > > + pr_err("%s: error reading cmdmode timing properties\n", > > + of_node_full_name(np)); > > + return -EINVAL; > > + } > > + > > + return 0; > > +} > > + > > +/** > > + * of_get_cmdmode_display_timing - parse a cmdmode_display_timing entry > > + * @np: device_node with the timing subnode > > + * @name: name of the timing node > > + * @cmdt: cmdmode_display_timing struct to fill > > + **/ > > +int of_get_cmdmode_display_timing(struct device_node *np, const char > > *name, + struct cmdmode_display_timing *cmdt) > > +{ > > + struct device_node *timing_np; > > + > > + if (!np) { > > + pr_err("%s: no devicenode given\n", of_node_full_name(np)); > > + return -EINVAL; > > + } > > + > > + timing_np = of_get_child_by_name(np, name); > > + if (!timing_np) { > > + pr_err("%s: could not find node '%s'\n", > > + of_node_full_name(np), name); > > + return -ENOENT; > > + } > > + > > + return of_parse_cmdmode_display_timing(timing_np, cmdt); > > +} > > +EXPORT_SYMBOL_GPL(of_get_cmdmode_display_timing); > > + > > +/** > > + * of_get_cmdmode_display_timings - parse all cmdmode_display_timing > > + * entries from a device_node > > + * @np: device_node with the subnodes > > + **/ > > +struct cmdmode_display_timings* > > +of_get_cmdmode_display_timings(struct device_node *np) > > +{ > > + struct device_node *timings_np; > > + struct device_node *entry; > > + struct device_node *native_mode; > > + struct cmdmode_display_timings *cmdts; > > + > > + if (!np) { > > + pr_err("%s: no device node given\n", of_node_full_name(np)); > > + return NULL; > > + } > > + > > + timings_np = of_get_child_by_name(np, "cmdmode-display-timings"); > > + if (!timings_np) { > > + pr_err("%s: could not find cmdmode-display-timings node\n", > > + of_node_full_name(np)); > > + return NULL; > > + } > > + > > + cmdts = kzalloc(sizeof(*cmdts), GFP_KERNEL); > > + if (!cmdts) { > > + pr_err("%s: could not allocate struct cmdts'\n", > > + of_node_full_name(np)); > > + goto cmdtsfail; > > + } > > + > > + entry = of_parse_phandle(timings_np, "native-mode", 0); > > + /* assume first child as native mode if none provided */ > > + if (!entry) > > + entry = of_get_next_child(np, NULL); > > + /* if there is no child, it is useless to go on */ > > + if (!entry) { > > + pr_err("%s: no timing specifications given\n", > > + of_node_full_name(np)); > > + goto entryfail; > > + } > > + > > + pr_debug("%s: using %s as default timing\n", > > + of_node_full_name(np), entry->name); > > + > > + native_mode = entry; > > + > > + cmdts->num_timings = of_get_child_count(timings_np); > > + if (cmdts->num_timings == 0) { > > + /* should never happen, as entry was already found above */ > > + pr_err("%s: no timings specified\n", of_node_full_name(np)); > > + goto entryfail; > > + } > > + > > + cmdts->timings = kzalloc(sizeof(struct cmdmode_display_timing *) * > > + cmdts->num_timings, GFP_KERNEL); > > + if (!cmdts->timings) { > > + pr_err("%s: could not allocate timings array\n", > > + of_node_full_name(np)); > > + goto entryfail; > > + } > > + > > + cmdts->num_timings = 0; > > + cmdts->native_mode = 0; > > + > > + for_each_child_of_node(timings_np, entry) { > > + struct cmdmode_display_timing *cmdt; > > + int r; > > + > > + cmdt = kzalloc(sizeof(*cmdt), GFP_KERNEL); > > + if (!cmdt) { > > + pr_err("%s: could not allocate cmdmode_display_timing\n" > > + , of_node_full_name(np)); > > + goto timingfail; > > + } > > + > > + r = of_parse_cmdmode_display_timing(entry, cmdt); > > + if (r) { > > + /* > > + * to not encourage wrong devicetrees, fail in case of > > + * an error > > + */ > > + pr_err("%s: error in timing %d\n", > > + of_node_full_name(np), cmdts->num_timings + 1); > > + goto timingfail; > > + } > > + > > + if (native_mode == entry) > > + cmdts->native_mode = cmdts->num_timings; > > + > > + cmdts->timings[cmdts->num_timings] = cmdt; > > + cmdts->num_timings++; > > + } > > + of_node_put(timings_np); > > + /* > > + * native_mode points to the device_node returned by of_parse_phandle > > + * therefore call of_node_put on it > > + */ > > + of_node_put(native_mode); > > + > > + pr_debug("%s: got %d timings. Using timing #%d as default\n", > > + of_node_full_name(np), cmdts->num_timings, > > + cmdts->native_mode + 1); > > + > > + return cmdts; > > + > > +timingfail: > > + if (native_mode) > > + of_node_put(native_mode); > > + cmdmode_display_timings_release(cmdts); > > +entryfail: > > + kfree(cmdts); > > +cmdtsfail: > > + of_node_put(timings_np); > > + return NULL; > > +} > > +EXPORT_SYMBOL_GPL(of_get_cmdmode_display_timings); > > + > > +/** > > + * of_cmdmode_display_timings_exist - check if a display-timings node is > > + * provided > > + * @np: device_node with the timing > > + **/ > > +int of_cmdmode_display_timings_exist(struct device_node *np) > > +{ > > + struct device_node *timings_np; > > + > > + if (!np) > > + return -EINVAL; > > + > > + timings_np = of_parse_phandle(np, "cmdmode-display-timings", 0); > > + if (!timings_np) > > + return -EINVAL; > > + > > + of_node_put(timings_np); > > + return 1; > > +} > > +EXPORT_SYMBOL_GPL(of_cmdmode_display_timings_exist); > > diff --git a/include/video/cmdmode.h b/include/video/cmdmode.h > > new file mode 100644 > > index 0000000..61ee71e > > --- /dev/null > > +++ b/include/video/cmdmode.h > > @@ -0,0 +1,67 @@ > > +/* > > + * generic cmdmode description > > + * > > + * Copyright 2014 YoungJun Cho <yj44.cho@xxxxxxxxxxx> > > + * > > + * This program is free software; you can redistribute it and/or modify > > + * it under the terms of the GNU General Public License version 2 as > > + * published by the Free Software Foundation. > > + */ > > + > > +#ifndef __LINUX_CMDMODE_H > > +#define __LINUX_CMDMODE_H > > + > > +#include <linux/types.h> > > +#include <video/cmdmode_display_timing.h> > > + > > +/* > > + * Subsystem independent description of a cmdmode. > > + * Can be generated from struct cmdmode_display_timing. > > + * @pixelclock: display clock in Hz > > + * @hactive: horizontal active video > > + * @vactive: vertical active video > > + * @cs_setup: clock cycles for the active period of address signal is > > enabled + * until chip select is enabled > > + * @wr_setup: clock cycles for the active period of CS signal is enabled > > until + * write signal is enabled > > + * @wr_active: clock cycles for the active period of CS is enabled > > + * @wr_hold: clock cycles for the active period of CS is disabled until > > write + * signal is disabled > > + */ > > +struct cmdmode { > > + unsigned long pixelclock; > > + > > + u32 hactive; > > + u32 vactive; > > + > > + u32 cs_setup; > > + u32 wr_setup; > > + u32 wr_active; > > + u32 wr_hold; > > +}; > > + > > +/** > > + * cmdmode_from_timing - convert display timing to cmdmode > > + * @cmdt: cmdmode_display_timing structure > > + * @cm: return value > > + * > > + * DESCRIPTION: > > + * This function converts a struct cmdmode_display_timing to a struct > > cmdmode. + */ > > +void cmdmode_from_timing(const struct cmdmode_display_timing *cmdt, > > + struct cmdmode *cm); > > + > > +/** > > + * cmdmode_from_timings - convert one display timings entry to cmdmode > > + * @disp: structure with all possible timing entries > > + * @cm: return value > > + * @index: index into the list of display timings in devicetree > > + * > > + * DESCRIPTION: > > + * This function converts one struct cmdmode_display_timing entry to a > > + * struct cmdmode. > > + */ > > +int cmdmode_from_timings(const struct cmdmode_display_timings *cmdts, > > + struct cmdmode *cm, unsigned int index); > > + > > +#endif /* __LINUX_CMDMODE_H */ > > diff --git a/include/video/cmdmode_display_timing.h > > b/include/video/cmdmode_display_timing.h new file mode 100644 > > index 0000000..5005660 > > --- /dev/null > > +++ b/include/video/cmdmode_display_timing.h > > @@ -0,0 +1,59 @@ > > +/* > > + * description of cmdmode display timings > > + * > > + * Copyright 2014 YoungJun Cho <yj44.cho@xxxxxxxxxxx> > > + * > > + * This program is free software; you can redistribute it and/or modify > > + * it under the terms of the GNU General Public License version 2 as > > + * published by the Free Software Foundation. > > + */ > > + > > +#ifndef __LINUX_CMDMODE_DISPLAY_TIMING_H > > +#define __LINUX_CMDMODE_DISPLAY_TIMING_H > > + > > +#include <linux/types.h> > > + > > +/* > > + * Single "mode" entry. This describes one set of signal timings a > > display can + * have in one setting. This struct can later be converted > > to struct cmdmode + * (see include/video/cmdmode.h). > > + */ > > +struct cmdmode_display_timing { > > + u32 pixelclock; > > + > > + u32 hactive; > > + u32 vactive; > > + > > + u32 cs_setup; > > + u32 wr_setup; > > + u32 wr_active; > > + u32 wr_hold; > > +}; > > + > > +/* > > + * This describes all timing settings a display provides. > > + * The native_mode is the default setting for this display. > > + * Drivers that can handle multiple cmdmodes should work with this struct > > + * and convert each entry to the desired end result. > > + */ > > +struct cmdmode_display_timings { > > + unsigned int num_timings; > > + unsigned int native_mode; > > + > > + struct cmdmode_display_timing **timings; > > +}; > > + > > +/* get one entry from struct cmdmode_display_timings */ > > +static inline struct cmdmode_display_timing* > > +cmdmode_display_timings_get(const struct cmdmode_display_timings *cmdts, > > + unsigned int index) > > +{ > > + if (cmdts->num_timings > index) > > + return cmdts->timings[index]; > > + else > > + return NULL; > > +} > > + > > +void cmdmode_display_timings_release(struct cmdmode_display_timings > > *cmdts); + > > +#endif /* __LINUX_CMDDMODE_DISPLAY_TIMING_H */ > > diff --git a/include/video/of_cmdmode.h b/include/video/of_cmdmode.h > > new file mode 100644 > > index 0000000..fb7c6c7 > > --- /dev/null > > +++ b/include/video/of_cmdmode.h > > @@ -0,0 +1,19 @@ > > +/* > > + * Copyright 2014 YoungJun Cho <yj44.cho@xxxxxxxxxxx> > > + * > > + * cmdmode of-helpers > > + * > > + * This program is free software; you can redistribute it and/or modify > > + * it under the terms of the GNU General Public License version 2 as > > + * published by the Free Software Foundation. > > + */ > > + > > +#ifndef __LINUX_OF_CMDMODE_H > > +#define __LINUX_OF_CMDMODE_H > > + > > +struct device_node; > > +struct cmdmode; > > + > > +int of_get_cmdmode(struct device_node *np, struct cmdmode *cm, int > > index); > > + > > +#endif /* __LINUX_OF_CMDMODE_H */ > > diff --git a/include/video/of_cmdmode_display_timing.h > > b/include/video/of_cmdmode_display_timing.h new file mode 100644 > > index 0000000..6be91ba > > --- /dev/null > > +++ b/include/video/of_cmdmode_display_timing.h > > @@ -0,0 +1,26 @@ > > +/* > > + * Copyright 2014 YoungJun Cho <yj44.cho@xxxxxxxxxxx> > > + * > > + * cmdmode display timings of helpers > > + * > > + * This program is free software; you can redistribute it and/or modify > > + * it under the terms of the GNU General Public License version 2 as > > + * published by the Free Software Foundation. > > + */ > > + > > +#ifndef __LINUX_OF_CMDMODE_DISPLAY_TIMING_H > > +#define __LINUX_OF_CMDMODE_DISPLAY_TIMING_H > > + > > +struct device_node; > > +struct cmdmode_display_timing; > > +struct cmdmode_display_timings; > > + > > +#define OF_USE_CMDMODE_NATIVE_MODE -1 > > + > > +int of_get_cmdmode_display_timing(struct device_node *np, const char > > *name, + struct cmdmode_display_timing *cmdt); > > +struct cmdmode_display_timings* > > + of_get_cmdmode_display_timings(struct device_node *np); > > +int of_cmdmode_display_timings_exist(struct device_node *np); > > + > > +#endif /* __LINUX_OF_CMDMODE_DISPLAY_TIMING_H */
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