linaro-dev September 2010

linaro-dev@lists.linaro.org

78 participants
101 discussions

Notes & Actions: Linaro graphics/multimedia - Aug 30, 2010 and Sep 06, 2010

by Alexandros Frantzis

Hi, notes and actions from our Monday graphics and multimedia cross-vendor call are available on the wiki: + https://wiki.linaro.org/Platform/UserPlatforms/2010-08-30 + https://wiki.linaro.org/Platform/UserPlatforms/2010-09-06 Details about when and where of this meeting can be found here: + https://wiki.linaro.org/WorkingGroups/Middleware/Graphics#Weekly%20Public%2… Thanks, -- - Alexandros

13 years, 8 months

[PATCH] OMAP CPUIDLE: CPU Idle latency measurement

by vishwanath.sripathy＠linaro.org

From: Vishwanath BS <vishwanath.sripathy(a)linaro.org> This patch has instrumentation code for measuring latencies for various CPUIdle C states for OMAP. Idea here is to capture the timestamp at various phases of CPU Idle and then compute the sw latency for various c states. For OMAP, 32k clock is chosen as reference clock this as is an always on clock. wkup domain memory (scratchpad memory) is used for storing timestamps. One can see the worstcase latencies in below sysfs entries (after enabling CONFIG_CPU_IDLE_PROF in .config). This information can be used to correctly configure cpu idle latencies for various C states after adding HW latencies for each of these sw latencies. /sys/devices/system/cpu/cpu0/cpuidle/state<n>/actual_latency /sys/devices/system/cpu/cpu0/cpuidle/state<n>/sleep_latency /sys/devices/system/cpu/cpu0/cpuidle/state<n>/wkup_latency THis patch is tested on OMAP ZOOM3 using kevin's pm branch. Signed-off-by: Vishwanath BS <vishwanath.sripathy(a)linaro.org> Cc: linaro-dev(a)lists.linaro.org --- arch/arm/mach-omap2/cpuidle34xx.c | 58 ++++++++++++++++-- arch/arm/mach-omap2/pm.h | 5 ++ arch/arm/mach-omap2/sleep34xx.S | 121 +++++++++++++++++++++++++++++++++++++ drivers/cpuidle/Kconfig | 5 ++ drivers/cpuidle/sysfs.c | 16 +++++- include/linux/cpuidle.h | 3 + 6 files changed, 202 insertions(+), 6 deletions(-) diff --git a/arch/arm/mach-omap2/cpuidle34xx.c b/arch/arm/mach-omap2/cpuidle34xx.c index 3d3d035..398bef8 --- a/arch/arm/mach-omap2/cpuidle34xx.c +++ b/arch/arm/mach-omap2/cpuidle34xx.c @@ -25,6 +25,7 @@ #include <linux/sched.h> #include <linux/cpuidle.h> +#include <linux/clk.h> #include <plat/prcm.h> #include <plat/irqs.h> #include <plat/powerdomain.h> @@ -86,6 +87,11 @@ static struct cpuidle_params cpuidle_params_table[] = { {1, 10000, 30000, 300000}, }; +#ifdef CONFIG_CPU_IDLE_PROF +static struct clk *clk_32k; +#define CONVERT_32K_USEC(lat) (lat * (USEC_PER_SEC/clk_get_rate(clk_32k))) +#endif + static int omap3_idle_bm_check(void) { if (!omap3_can_sleep()) @@ -115,21 +121,28 @@ static int _cpuidle_deny_idle(struct powerdomain *pwrdm, * Called from the CPUidle framework to program the device to the * specified target state selected by the governor. */ + static int omap3_enter_idle(struct cpuidle_device *dev, struct cpuidle_state *state) { struct omap3_processor_cx *cx = cpuidle_get_statedata(state); struct timespec ts_preidle, ts_postidle, ts_idle; u32 mpu_state = cx->mpu_state, core_state = cx->core_state; +#ifdef CONFIG_CPU_IDLE_PROF + int idle_time, latency; + long sleep_time, wkup_time, total_sleep_time; + long preidle_time, postidle_time; +#endif current_cx_state = *cx; - /* Used to keep track of the total time in idle */ - getnstimeofday(&ts_preidle); - local_irq_disable(); local_fiq_disable(); - + /* Used to keep track of the total time in idle */ + getnstimeofday(&ts_preidle); +#ifdef CONFIG_CPU_IDLE_PROF + preidle_time = omap3_sram_get_32k_tick(); +#endif pwrdm_set_next_pwrst(mpu_pd, mpu_state); pwrdm_set_next_pwrst(core_pd, core_state); @@ -153,9 +166,39 @@ return_sleep_time: getnstimeofday(&ts_postidle); ts_idle = timespec_sub(ts_postidle, ts_preidle); +#ifdef CONFIG_CPU_IDLE_PROF + postidle_time = omap3_sram_get_32k_tick(); +#endif local_irq_enable(); local_fiq_enable(); +#ifdef CONFIG_CPU_IDLE_PROF + sleep_time = omap3_sram_get_sleep_time(); + wkup_time = omap3_sram_get_wkup_time(); + + /* take care of overflow */ + if (postidle_time < preidle_time) + postidle_time += (u32) 0xffffffff; + if (wkup_time < sleep_time) + wkup_time += (u32) 0xffffffff; + + idle_time = postidle_time - preidle_time; + total_sleep_time = wkup_time - sleep_time; + latency = idle_time - total_sleep_time; + sleep_time = omap3_sram_get_sleep_time(); + wkup_time = omap3_sram_get_wkup_time(); + + /* calculate average latency after ignoring sprious ones */ + if ((total_sleep_time > 0) && (latency > state->actual_latency) + && (latency >= 0)) { + state->actual_latency = CONVERT_32K_USEC(latency); + latency = (sleep_time - preidle_time); + state->sleep_latency = CONVERT_32K_USEC(latency); + latency = postidle_time - wkup_time; + state->wkup_latency = CONVERT_32K_USEC(latency); + } +#endif + return ts_idle.tv_nsec / NSEC_PER_USEC + ts_idle.tv_sec * USEC_PER_SEC; } @@ -423,7 +466,9 @@ int __init omap3_idle_init(void) struct omap3_processor_cx *cx; struct cpuidle_state *state; struct cpuidle_device *dev; - +#ifdef CONFIG_CPU_IDLE_PROF + static struct device dummy_device; +#endif mpu_pd = pwrdm_lookup("mpu_pwrdm"); core_pd = pwrdm_lookup("core_pwrdm"); @@ -456,6 +501,9 @@ int __init omap3_idle_init(void) omap3_cpuidle_update_states(); +#ifdef CONFIG_CPU_IDLE_PROF + clk_32k = clk_get(&dummy_device, "wkup_32k_fck"); +#endif if (cpuidle_register_device(dev)) { printk(KERN_ERR "%s: CPUidle register device failed\n", __func__); diff --git a/arch/arm/mach-omap2/pm.h b/arch/arm/mach-omap2/pm.h index 3de6ece..e62e87d 100644 --- a/arch/arm/mach-omap2/pm.h +++ b/arch/arm/mach-omap2/pm.h @@ -82,4 +82,9 @@ extern unsigned int save_secure_ram_context_sz; extern unsigned int omap24xx_cpu_suspend_sz; extern unsigned int omap34xx_cpu_suspend_sz; +#ifdef CONFIG_CPU_IDLE_PROF +extern u32 omap3_sram_get_wkup_time(); +extern u32 omap3_sram_get_sleep_time(); +extern u32 omap3_sram_get_32k_tick(); +#endif #endif diff --git a/arch/arm/mach-omap2/sleep34xx.S b/arch/arm/mach-omap2/sleep34xx.S index d522cd7..8dec5ef 100644 --- a/arch/arm/mach-omap2/sleep34xx.S +++ b/arch/arm/mach-omap2/sleep34xx.S @@ -59,6 +59,20 @@ #define SDRC_DLLA_STATUS_V OMAP34XX_SDRC_REGADDR(SDRC_DLLA_STATUS) #define SDRC_DLLA_CTRL_V OMAP34XX_SDRC_REGADDR(SDRC_DLLA_CTRL) +#define TIMER_32K_SYNC_P 0x48320010 +#define TIMER_32K_SYNC OMAP2_L4_IO_ADDRESS(TIMER_32K_SYNC_P) + +#define SCRATCHPAD_SLEEP_TIME_OFFSET 0x9f8 +#define SCRATCHPAD_WKUP_TIME_OFFSET 0x9fc +#define SCRATCHPAD_SLEEP_TIME OMAP343X_CTRL_REGADDR(SCRATCHPAD_SLEEP_TIME_OFFSET) +#define SCRATCHPAD_WKUP_TIME OMAP343X_CTRL_REGADDR(SCRATCHPAD_WKUP_TIME_OFFSET) +#define SCRATCHPAD_WKUP_TIME_P OMAP343X_CTRL_BASE + SCRATCHPAD_WKUP_TIME_OFFSET + +#define CM_ICLKEN_WKUP OMAP34XX_CM_REGADDR(WKUP_MOD, CM_ICLKEN) +#define CM_ICLKEN_WKUP_P OMAP3430_CM_BASE + WKUP_MOD + CM_ICLKEN +#define CM_IDLEST_WKUP OMAP34XX_CM_REGADDR(WKUP_MOD, CM_IDLEST) +#define CM_IDLEST_WKUP_P OMAP3430_CM_BASE + WKUP_MOD + CM_IDLEST + .text /* Function to aquire the semaphore in scratchpad */ ENTRY(lock_scratchpad_sem) @@ -183,7 +197,31 @@ api_params: .word 0x4, 0x0, 0x0, 0x1, 0x1 ENTRY(save_secure_ram_context_sz) .word . - save_secure_ram_context +#ifdef CONFIG_CPU_IDLE_PROF +ENTRY(omap3_sram_get_wkup_time) + stmfd sp!, {lr} @ save registers on stack + ldr r0, wkup_time + ldr r0, [r0] + ldmfd sp!, {pc} @ restore regs and return +ENTRY(omap3_sram_get_wkup_time_sz) + .word . - omap3_sram_get_wkup_time + +ENTRY(omap3_sram_get_sleep_time) + stmfd sp!, {lr} @ save registers on stack + ldr r0, sleep_time + ldr r0, [r0] + ldmfd sp!, {pc} @ restore regs and return +ENTRY(omap3_sram_get_sleep_time_sz) + .word . - omap3_sram_get_sleep_time +ENTRY(omap3_sram_get_32k_tick) + stmfd sp!, {lr} @ save registers on stack + ldr r0, sync_32k_timer + ldr r0, [r0] + ldmfd sp!, {pc} @ restore regs and return +ENTRY(omap3_sram_get_32k_tick_sz) + .word . - omap3_sram_get_32k_tick +#endif /* * Forces OMAP into idle state * @@ -207,6 +245,13 @@ loop: cmp r1, #0x0 /* If context save is required, do that and execute wfi */ bne save_context_wfi + +#ifdef CONFIG_CPU_IDLE_PROF + ldr r4, sync_32k_timer + ldr r5, [r4] + ldr r6, sleep_time + str r5, [r6] +#endif /* Data memory barrier and Data sync barrier */ mov r1, #0 mcr p15, 0, r1, c7, c10, 4 @@ -224,8 +269,25 @@ loop: nop nop nop +#ifdef CONFIG_CPU_IDLE_PROF + ldr r4, iclken_wkup + ldr r5, [r4] + orr r5, r5, #0x4 + str r5, [r4] + ldr r4, idlest_wkup +wait_idlest: + ldr r5, [r4] + and r5, r5, #0x4 + cmp r5, #0x0 + bne wait_idlest + ldr r4, sync_32k_timer + ldr r5, [r4] + ldr r6, wkup_time + str r5, [r6] +#endif bl wait_sdrc_ok + ldmfd sp!, {r0-r12, pc} @ restore regs and return restore_es3: /*b restore_es3*/ @ Enable to debug restore code @@ -247,6 +309,23 @@ copy_to_sram: blx r1 restore: /* b restore*/ @ Enable to debug restore code +#ifdef CONFIG_CPU_IDLE_PROF + ldr r4, iclken_wkup_p + ldr r5, [r4] + orr r5, r5, #0x4 + str r5, [r4] + ldr r4, idlest_wkup_p +wait_idlest1: + ldr r5, [r4] + and r5, r5, #0x4 + cmp r5, #0x0 + bne wait_idlest1 + ldr r4, sync_32k_timer_p + ldr r5, [r4] + ldr r6, wkup_time_p + str r5, [r6] +#endif + /* Check what was the reason for mpu reset and store the reason in r9*/ /* 1 - Only L1 and logic lost */ /* 2 - Only L2 lost - In this case, we wont be here */ @@ -587,6 +666,12 @@ finished: mcr p15, 2, r10, c0, c0, 0 isb skip_l2_inval: +#ifdef CONFIG_CPU_IDLE_PROF + ldr r4, sync_32k_timer + ldr r5, [r4] + ldr r6, sleep_time + str r5, [r6] +#endif /* Data memory barrier and Data sync barrier */ mov r1, #0 mcr p15, 0, r1, c7, c10, 4 @@ -603,6 +688,22 @@ skip_l2_inval: nop nop nop +#ifdef CONFIG_CPU_IDLE_PROF + ldr r4, iclken_wkup + ldr r5, [r4] + orr r5, r5, #0x4 + str r5, [r4] + ldr r4, idlest_wkup +wait_idlest2: + ldr r5, [r4] + and r5, r5, #0x4 + cmp r5, #0x0 + bne wait_idlest2 + ldr r4, sync_32k_timer + ldr r5, [r4] + ldr r6, wkup_time + str r5, [r6] +#endif bl wait_sdrc_ok /* restore regs and return */ ldmfd sp!, {r0-r12, pc} @@ -668,5 +769,25 @@ cache_pred_disable_mask: .word 0xFFFFE7FB control_stat: .word CONTROL_STAT +#ifdef CONFIG_CPU_IDLE_PROF +sync_32k_timer: + .word TIMER_32K_SYNC +sync_32k_timer_p: + .word TIMER_32K_SYNC_P +sleep_time: + .word SCRATCHPAD_SLEEP_TIME +wkup_time: + .word SCRATCHPAD_WKUP_TIME +wkup_time_p: + .word SCRATCHPAD_WKUP_TIME_P +iclken_wkup: + .word CM_ICLKEN_WKUP +iclken_wkup_p: + .word CM_ICLKEN_WKUP_P +idlest_wkup: + .word CM_IDLEST_WKUP +idlest_wkup_p: + .word CM_IDLEST_WKUP_P +#endif ENTRY(omap34xx_cpu_suspend_sz) .word . - omap34xx_cpu_suspend diff --git a/drivers/cpuidle/Kconfig b/drivers/cpuidle/Kconfig index 7dbc4a8..147456d 100644 --- a/drivers/cpuidle/Kconfig +++ b/drivers/cpuidle/Kconfig @@ -18,3 +18,8 @@ config CPU_IDLE_GOV_MENU bool depends on CPU_IDLE && NO_HZ default y + +config CPU_IDLE_PROF + bool + depends on CPU_IDLE + default n diff --git a/drivers/cpuidle/sysfs.c b/drivers/cpuidle/sysfs.c index 0310ffa..a3e9db1 100644 --- a/drivers/cpuidle/sysfs.c +++ b/drivers/cpuidle/sysfs.c @@ -249,6 +249,11 @@ define_show_state_ull_function(usage) define_show_state_ull_function(time) define_show_state_str_function(name) define_show_state_str_function(desc) +#ifdef CONFIG_CPU_IDLE_PROF +define_show_state_function(actual_latency) +define_show_state_function(sleep_latency) +define_show_state_function(wkup_latency) +#endif define_one_state_ro(name, show_state_name); define_one_state_ro(desc, show_state_desc); @@ -256,7 +261,11 @@ define_one_state_ro(latency, show_state_exit_latency); define_one_state_ro(power, show_state_power_usage); define_one_state_ro(usage, show_state_usage); define_one_state_ro(time, show_state_time); - +#ifdef CONFIG_CPU_IDLE_PROF +define_one_state_ro(actual_latency, show_state_actual_latency); +define_one_state_ro(sleep_latency, show_state_sleep_latency); +define_one_state_ro(wkup_latency, show_state_wkup_latency); +#endif static struct attribute *cpuidle_state_default_attrs[] = { &attr_name.attr, &attr_desc.attr, @@ -264,6 +273,11 @@ static struct attribute *cpuidle_state_default_attrs[] = { &attr_power.attr, &attr_usage.attr, &attr_time.attr, +#ifdef CONFIG_CPU_IDLE_PROF + &attr_actual_latency.attr, + &attr_sleep_latency.attr, + &attr_wkup_latency.attr, +#endif NULL }; diff --git a/include/linux/cpuidle.h b/include/linux/cpuidle.h index 55215cc..6474f6a 100644 --- a/include/linux/cpuidle.h +++ b/include/linux/cpuidle.h @@ -43,6 +43,9 @@ struct cpuidle_state { int (*enter) (struct cpuidle_device *dev, struct cpuidle_state *state); +#ifdef CONFIG_CPU_IDLE_PROF + u32 actual_latency, sleep_latency, wkup_latency; +#endif }; /* Idle State Flags */ -- 1.7.0.4

13 years, 8 months

Minutes Sept 1st User Platforms Status Meeting

by Tom Gall

Greetings, Enclosed you'll find a link to the agenda, notes and actions from the Linaro User Platforms Weekly Status meeting dated 9/01 held in #linaro-meeting at 13:00 UTC. https://wiki.linaro.org/Platform/UserPlatforms/WeeklyStatus/2010-09-01 Regards, Tom (tgall_foo) User Platforms Team

13 years, 8 months

Re: Profiling fixes for -stable

by Nicolas Pitre

On Fri, 3 Sep 2010, Will Deacon wrote: > Hi Nicolas, > > If you're still accepting fixes for the 2.6.35 stable Linaro Kernel > then I have some small profiling updates for you: Thanks. Merged and pushed out. Nicolas

13 years, 8 months

[PM] 25/08/10 - Minutes for the Power Management WG weekly call

by Amit Kucheria

The minutes of the weekly call can be found at: https://wiki.linaro.org/WorkingGroups/PowerManagement/Meetings/2010-08-25 The minutes and actions are copied below. Regards, Amit Attendees: Linaro: Amit Kucheria, Amit Arora, Yong Shen ARM: Robin Randhawa, Bobby Batacharia, Srinivas Kalaga == Action Items from this Meeting == * ACTION: Yong to work with John Rigby and Ubuntu kernel team to make sure the Linaro kernel contains powertop kernel patches * ACTION: Vishwa to verify powertop on 2.6.35 * ACTION: Vishwa to check with cpuidle/cpufreq experts in TI for verifying cpufreq behavior on multi-core OMAP * ACTION: Amit A to get the powertop patch integrated into Linaro/Ubuntu packages * ACTION: Yong to test common clk API patches on imx5 and help get it booting on babbage 3.0 == Action Items from Previous Meeting == * ACTIVE (Immediate): * ACTION: Amit A to test on pm enabled OMAP3 board: DONE on 2.6.32 on zoom3 board * New ACTION: Vishwa to verify on 2.6.35 * ACTION: Amit A to document details on power supply class (battery info) to PowerTOP internal wiki page: DONE * ACTION: Yong to look into getting powertop kernel patches applied to Linaro kernel tree: Not DONE * New ACTION: Yong to work with John Rigby and make sure the Linaro kernel contains it * ACTION: Robin to send links to patches sent to linux-pm: DONE * http://www.spinics.net/lists/cpufreq/msg01740.html * It was a pointer to a discussion on having different governors on different cores * ACTION: Amit K to spend some time on usecase to reproduce ondemand governor problems: POSTPONED * ACTION: Yong to look at common clock FW, find out if debug info being exported (usage count, clk rate, dependencies): DONE * DORMANT : * ACTION: ARM to share internal instrumentation flow (BAB: we might also align with Linaro on workload discussions) * Might take couple of months * ACTION: Amit K to talk to jeremy about power domain framework: DONE * Jeremy needs help, will revisit in a few weeks * ACTION: Srinivas to provide details of where he believes userspace - kernel interaction is required. (low prio) * ACTION: Bobby to check on multi-core boards availability (request open) * ACTION: ARM to discuss giving out internal Eclipse based tool (similar to powertop) (no ETA as of now) * ACTION: Amit Kucheria and Vishwa to get inputs from community on the issues related to CPUIDLE governor: POSTPONED until instrumentation work == Minutes == * Discussion on http://www.spinics.net/lists/cpufreq/msg01740.html * For ARM, both cores run at same frequency (CMP) * Does it make sense for them to run different governors on each core? * The consensus currently is NO * TI uses ondemand governor + policy manager * One core is kept OFF, all processing happens on the other one. * If load on one core goes above a threshold, they turn ON other core * Both cores run at same Operating Point once ON * Debug info in common clk API being discussed upstream by Jeremy * There is currently no debug info * clock name is not part of the common struct clk to keep size down * Need to engage with Jeremy * Yong will test the patches from Jeremy on imx5 and report back * Powerdebug: should we visualise the clock and power dependencies using information from /sys or debugfs? * No immediate horror expressed at the idea * Freescale and TI already do it to a certain extent by dumping the clock tree and rates into a table * The entire tree is too complex to depict * We could represent it in parts e.g. start at a peripheral and plot it's clock and power dependencies all the way up

13 years, 8 months

Re: imx51 and CONFIG_NEON

by Dave Martin

On Fri, Sep 3, 2010 at 1:41 PM, Amit Kucheria <amit.kucheria(a)linaro.org> wrote: > I copied the 2 patches to http://people.canonical.com/~amitk/imx5 > OK, as far as I can make out the patch does the right thing. On Babbage 2.0 and the Pegatron lange5.1/nettop platforms, your check is triggered, and at least on Babbage 2.0 /proc/cpuinfo and /proc/self/auxv reflect the absence of NEON correctly. (I couldn't boot to an fs on the Pegatron platform --- in any case I had to bodge the machine ID passed by the bootloader to persuage the kernel to boot). On Babbage 3.0, NEON is reported as present in /proc/cpuinfo and /proc/self/auxv. See the attached logs. Cheers ---Dave

13 years, 8 months

Re: Barebox

by Jean-Christophe PLAGNIOL-VILLARD

Cc -dev On 06:15 Mon 06 Sep , Jean-Christophe PLAGNIOL-VILLARD wrote: > Hi all, > > I've like to open the discussion about barebox > > What is Barebox? > > Barebox is a fork of U-Boot which was named before the elce 2009 > U-Boot-V2 with the target to have a modern internal Implememtation > derived from the Linux kernel and user friendly interface > > The current design of barebox is very near from the kernel as example > on AT91 I've update the current API to be as near as possible as the > one in the kernel so it's now really easy to port a new board and on > contrary of U-Boot we can have the multy instance of the drivers. > > I'm start to push the SH with the same idea > > As example have the prompt on all uart at the same time or be able to use > them independently. > > We also support FastBoot, Framebuffer, USB ohci & Ehci, network, nor, > nandflash, dfu, usb ethernet (very usefull for soc without net > device), Menu Framework, etc... > > inprogress mmc, spi flash > > DFU for Device Firmware Upgrade is very use full to update device from > usb device from a PC so you will have an generic updater from the > bootloader > > The Menu Framework will help you to create friendly interface to manage > the booloader via key specially on device without keyboard as cellphone, > STB etc... > > We have also a true shell support with scripting so it's very easy to > create complex command via sheel script and also complex boot sequence > > We have modules support as the kernel which allow to load code based > on the need and speed up the boot but also allow to update the > bootloader functionnality in the feature > > etc... > > Best Regards, > J. > > _______________________________________________ > boot-architecture mailing list > boot-architecture(a)lists.linaro.org > http://lists.linaro.org/mailman/listinfo/boot-architecture

13 years, 8 months

Maverick armel cross toolchain

by Jon Smirl

The toolchain isn't built with -mcallee-super-interworking enabled. Could we get that turned on? It is needed to make calls to thumb code in ROM. arm-linux-gnueabi-gcc -g -DDEBUG -Os -fno-strict-aliasing -fno-common -ffixed-r8 -ffunction-sections -msoft-float -Wcast-align -Wall -D__KERNEL__ -DTEXT_BASE= -fno-builtin -ffreestanding -isystem /usr/lib/gcc/arm-linux-gnueabi/4.5.1/include -pipe -march=armv4t -mlong-calls -mtune=arm7tdmi-s -DCONFIG_ARM -D__ARM__ -mthumb-interwork -Wall -Wstrict-prototypes -Wcast-align -Wextra -Werror -Iobj_redbee-econotag_board -I../board -DBOARD=redbee-econotag -I../lib/include -I../src -I. -mthumb -mcallee-super-interworking -MMD -c -o obj_redbee-econotag_board/sleep.o sleep.c sleep.c:1:0: error: AAPCS does not support -mcallee-super-interworking -- Jon Smirl jonsmirl(a)gmail.com

13 years, 8 months

[PATCH] UBUNTU - ARM: adding i2c eeprom driver to read EDID

by Mathieu Poirier

All, This patch creates an entry in /sys that allows user space utilities such as 'decode-edid' and 'parse-edid' to read the monitor's EDID information. Please consider adding to your tree. Processor: Omap3 Platform: beagleboard Cx Mathieu. >From 7d0d86809864cb852988a296b12dff6436c45480 Mon Sep 17 00:00:00 2001 From: Mathieu J. Poirier <mathieu.poirier(a)canonical.com> Date: Fri, 20 Aug 2010 14:25:53 -0600 Subject: [PATCH] UBUNTU - ARM: adding i2c eeprom driver to read EDID Adding i2c eeprom driver to access monitor EDID binary information from user space, something that is required by 'decode-edid' and 'parse-edid'. BugLink: https://bugs.launchpad.net/bugs/608279 Signed-off-by: Mathieu Poirier <mathieu.poirier(a)canonical.com> --- arch/arm/mach-omap2/board-omap3beagle.c | 8 +++++++- 1 files changed, 7 insertions(+), 1 deletions(-) diff --git a/arch/arm/mach-omap2/board-omap3beagle.c b/arch/arm/mach-omap2/board-omap3beagle.c index 7a1b351..fb6cbb9 100644 --- a/arch/arm/mach-omap2/board-omap3beagle.c +++ b/arch/arm/mach-omap2/board-omap3beagle.c @@ -355,13 +355,19 @@ static struct i2c_board_info __initdata beagle_i2c_boardinfo[] = { }, }; +static struct i2c_board_info __initdata beagle_i2c_eeprom[] = { + { + I2C_BOARD_INFO("eeprom", 0x50), + }, +}; + static int __init omap3_beagle_i2c_init(void) { omap_register_i2c_bus(1, 2600, beagle_i2c_boardinfo, ARRAY_SIZE(beagle_i2c_boardinfo)); /* Bus 3 is attached to the DVI port where devices like the pico DLP * projector don't work reliably with 400kHz */ - omap_register_i2c_bus(3, 100, NULL, 0); + omap_register_i2c_bus(3, 100, beagle_i2c_eeprom, ARRAY_SIZE(beagle_i2c_eeprom)); return 0; } -- 1.7.0.4

13 years, 8 months

PM support for OMAP

by Ameya Palande

Hi, AFAIU pm branch on linux-omap tree contains required patches, but they are not yet ready for inclusion in upstream kernel. How is linaro planning to provide pm support for TI omap[34] chips? Cheers, Ameya.

13 years, 8 months

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linaro-dev September 2010