target/linux/s3c24xx/patches-2.6.24/1179-fix-pcf50633-suspend-resume-onehit-i2c-other-meddlin.patch

   1 From 83636af17dab41d313411543c57984b5834cfcf2 Mon Sep 17 00:00:00 2001
   2 From: Andy Green <andy@openmoko.com>
   3 Date: Wed, 2 Jul 2008 22:39:10 +0100
   4 Subject: [PATCH] fix-pcf50633-suspend-resume-onehit-i2c-other-meddling.patch
   5
   6  - speed up suspend and resume by using one hit i2c bulk transactions
   7  - don't bother storing int mask set on suspend, the default one is
   8    what we use anyway
   9  - put stack_trace() on pcf50633 low level access that fire if we
  10    try to touch them before we resumed
  11  - cosmetic source cleanup
  12  - reduces resume time for pcf50633 from 450ms to 255ms
  13
  14 Signed-off-by: Andy Green <andy@openmoko.com>
  15 ---
  16  arch/arm/mach-s3c2440/mach-gta02.c |   21 ++-------
  17  drivers/i2c/chips/pcf50633.c       |   83 +++++++++++++++++++----------------
  18  2 files changed, 49 insertions(+), 55 deletions(-)
  19
  20 diff --git a/arch/arm/mach-s3c2440/mach-gta02.c b/arch/arm/mach-s3c2440/mach-gta02.c
  21 index 9ba1036..22de181 100644
  22 --- a/arch/arm/mach-s3c2440/mach-gta02.c
  23 +++ b/arch/arm/mach-s3c2440/mach-gta02.c
  24 @@ -477,24 +477,11 @@ static struct pcf50633_platform_data gta02_pcf_pdata = {
  25         .r_fix_batt_par = 10000,
  26         .r_sense_milli  = 220,
  27         .resumers = {
  28 -               [0] = /* PCF50633_INT1_ADPINS   | */
  29 -                 /* PCF50633_INT1_ADPREM       | */
  30 -                 PCF50633_INT1_USBINS          |
  31 -                 PCF50633_INT1_USBREM          |
  32 -                 PCF50633_INT1_ALARM,
  33 +               [0] = PCF50633_INT1_USBINS |
  34 +                     PCF50633_INT1_USBREM |
  35 +                     PCF50633_INT1_ALARM,
  36                 [1] = PCF50633_INT2_ONKEYF,
  37 -               [2] =  /* PCF50633_INT3_BATFULL | */
  38 -                 /* PCF50633_INT3_CHGHALT      | */
  39 -                 /* PCF50633_INT3_THLIMON      | */
  40 -                 /* PCF50633_INT3_THLIMOFF     | */
  41 -                 /* PCF50633_INT3_USBLIMON     | */
  42 -                 /* PCF50633_INT3_USBLIMOFF    | */
  43 -                 PCF50633_INT3_ONKEY1S ,
  44 -               [3] = 0                         /* |
  45 -                    PCF50633_INT4_LOWSYS       | */
  46 -                 /* PCF50633_INT4_LOWBAT       | */
  47 -                 /* PCF50633_INT4_HIGHTMP */,
  48 -               [4] = 0
  49 +               [2] = PCF50633_INT3_ONKEY1S
  50         },
  51         .rails  = {
  52                 [PCF50633_REGULATOR_AUTO] = {
  53 diff --git a/drivers/i2c/chips/pcf50633.c b/drivers/i2c/chips/pcf50633.c
  54 index aabf412..8cb6156 100644
  55 --- a/drivers/i2c/chips/pcf50633.c
  56 +++ b/drivers/i2c/chips/pcf50633.c
  57 @@ -163,10 +163,7 @@ struct pcf50633_data {
  58                 u_int8_t down2out, down2ena;
  59                 u_int8_t memldoout, memldoena;
  60                 u_int8_t ledout, ledena, leddim;
  61 -               struct {
  62 -                       u_int8_t out;
  63 -                       u_int8_t ena;
  64 -               } ldo[__NUM_PCF50633_REGS];
  65 +               u_int8_t ldo[__NUM_PCF50633_REGS][2];
  66         } standby_regs;
  67
  68         struct resume_dependency resume_dependency;
  69 @@ -187,6 +184,10 @@ static struct platform_device *pcf50633_pdev;
  70
  71  static int __reg_write(struct pcf50633_data *pcf, u_int8_t reg, u_int8_t val)
  72  {
  73 +       if (pcf->have_been_suspended == 1) {
  74 +               dev_err(&pcf->client.dev, "__reg_write while suspended\n");
  75 +               dump_stack();
  76 +       }
  77         return i2c_smbus_write_byte_data(&pcf->client, reg, val);
  78  }
  79
  80 @@ -205,6 +206,10 @@ static int32_t __reg_read(struct pcf50633_data *pcf, u_int8_t reg)
  81  {
  82         int32_t ret;
  83
  84 +       if (pcf->have_been_suspended == 1) {
  85 +               dev_err(&pcf->client.dev, "__reg_read while suspended\n");
  86 +               dump_stack();
  87 +       }
  88         ret = i2c_smbus_read_byte_data(&pcf->client, reg);
  89
  90         return ret;
  91 @@ -2165,6 +2170,13 @@ static int pcf50633_suspend(struct device *dev, pm_message_t state)
  92         struct i2c_client *client = to_i2c_client(dev);
  93         struct pcf50633_data *pcf = i2c_get_clientdata(client);
  94         int i;
  95 +       int ret;
  96 +       u_int8_t tmp;
  97 +
  98 +       /* we suspend once (!) as late as possible in the suspend sequencing */
  99 +
 100 +       if ((state.event != PM_EVENT_SUSPEND) || (pcf->have_been_suspended))
 101 +               return 0;
 102
 103         /* The general idea is to power down all unused power supplies,
 104          * and then mask all PCF50606 interrup sources but EXTONR, ONKEYF
 105 @@ -2186,25 +2198,25 @@ static int pcf50633_suspend(struct device *dev, pm_message_t state)
 106         pcf->standby_regs.ledout = __reg_read(pcf, PCF50633_REG_LEDOUT);
 107         pcf->standby_regs.ledena = __reg_read(pcf, PCF50633_REG_LEDENA);
 108         pcf->standby_regs.leddim = __reg_read(pcf, PCF50633_REG_LEDDIM);
 109 -       /* FIXME: one big read? */
 110 -       for (i = 0; i < 7; i++) {
 111 -               u_int8_t reg_out = PCF50633_REG_LDO1OUT + 2*i;
 112 -               pcf->standby_regs.ldo[i].out = __reg_read(pcf, reg_out);
 113 -               pcf->standby_regs.ldo[i].ena = __reg_read(pcf, reg_out+1);
 114 -       }
 115 +
 116 +       /* regulator voltages and enable states */
 117 +       ret = i2c_smbus_read_i2c_block_data(&pcf->client,
 118 +                                           PCF50633_REG_LDO1OUT, 14,
 119 +                                           &pcf->standby_regs.ldo[0][0]);
 120 +       if (ret != 14)
 121 +               dev_err(dev, "Failed to save LDO levels and enables :-(\n");
 122
 123         /* switch off power supplies that are not needed during suspend */
 124         for (i = 0; i < __NUM_PCF50633_REGULATORS; i++) {
 125 -               if (!(pcf->pdata->rails[i].flags & PMU_VRAIL_F_SUSPEND_ON)) {
 126 -                       u_int8_t tmp;
 127 -
 128 -                       DEBUGP("disabling pcf50633 regulator %u\n", i);
 129 -                       /* we cannot use pcf50633_onoff_set() because we're
 130 -                        * already under the mutex */
 131 -                       tmp = __reg_read(pcf, regulator_registers[i]+1);
 132 -                       tmp &= 0xfe;
 133 -                       __reg_write(pcf, regulator_registers[i]+1, tmp);
 134 -               }
 135 +               if ((pcf->pdata->rails[i].flags & PMU_VRAIL_F_SUSPEND_ON))
 136 +                       continue;
 137 +
 138 +               dev_dbg(dev, "disabling regulator %u\n", i);
 139 +               /* we cannot use pcf50633_onoff_set() because we're
 140 +                * already under the mutex */
 141 +               tmp = __reg_read(pcf, regulator_registers[i]+1);
 142 +               tmp &= 0xfe;
 143 +               __reg_write(pcf, regulator_registers[i]+1, tmp);
 144         }
 145
 146         /* turn off the backlight */
 147 @@ -2212,11 +2224,9 @@ static int pcf50633_suspend(struct device *dev, pm_message_t state)
 148         __reg_write(pcf, PCF50633_REG_LEDOUT, 2);
 149         __reg_write(pcf, PCF50633_REG_LEDENA, 0x00);
 150
 151 -       pcf->standby_regs.int1m = __reg_read(pcf, PCF50633_REG_INT1M);
 152 -       pcf->standby_regs.int2m = __reg_read(pcf, PCF50633_REG_INT2M);
 153 -       pcf->standby_regs.int3m = __reg_read(pcf, PCF50633_REG_INT3M);
 154 -       pcf->standby_regs.int4m = __reg_read(pcf, PCF50633_REG_INT4M);
 155 -       pcf->standby_regs.int5m = __reg_read(pcf, PCF50633_REG_INT5M);
 156 +       /* set interrupt masks so only those sources we want to wake
 157 +        * us are able to
 158 +        */
 159         __reg_write(pcf, PCF50633_REG_INT1M, ~pcf->pdata->resumers[0]);
 160         __reg_write(pcf, PCF50633_REG_INT2M, ~pcf->pdata->resumers[1]);
 161         __reg_write(pcf, PCF50633_REG_INT3M, ~pcf->pdata->resumers[2]);
 162 @@ -2250,16 +2260,13 @@ static int pcf50633_resume(struct device *dev)
 163  {
 164         struct i2c_client *client = to_i2c_client(dev);
 165         struct pcf50633_data *pcf = i2c_get_clientdata(client);
 166 -       int i;
 167 +       int ret;
 168
 169         mutex_lock(&pcf->lock);
 170
 171 -       /* Resume all saved registers that don't "survive" standby state */
 172 -       __reg_write(pcf, PCF50633_REG_INT1M, pcf->standby_regs.int1m);
 173 -       __reg_write(pcf, PCF50633_REG_INT2M, pcf->standby_regs.int2m);
 174 -       __reg_write(pcf, PCF50633_REG_INT3M, pcf->standby_regs.int3m);
 175 -       __reg_write(pcf, PCF50633_REG_INT4M, pcf->standby_regs.int4m);
 176 -       __reg_write(pcf, PCF50633_REG_INT5M, pcf->standby_regs.int5m);
 177 +       pcf->have_been_suspended = 2; /* resuming */
 178 +
 179 +       /* these guys get reset while pcf50633 is suspend state, refresh */
 180
 181         __reg_write(pcf, PCF50633_REG_OOCTIM2, pcf->standby_regs.ooctim2);
 182         __reg_write(pcf, PCF50633_REG_AUTOOUT, pcf->standby_regs.autoout);
 183 @@ -2275,12 +2282,12 @@ static int pcf50633_resume(struct device *dev)
 184         if (!pcf->pdata->defer_resume_backlight)
 185                 pcf50633_backlight_resume(pcf);
 186
 187 -       /* FIXME: one big read? */
 188 -       for (i = 0; i < 7; i++) {
 189 -               u_int8_t reg_out = PCF50633_REG_LDO1OUT + 2*i;
 190 -               __reg_write(pcf, reg_out, pcf->standby_regs.ldo[i].out);
 191 -               __reg_write(pcf, reg_out+1, pcf->standby_regs.ldo[i].ena);
 192 -       }
 193 +       /* regulator voltages and enable states */
 194 +       ret = i2c_smbus_write_i2c_block_data(&pcf->client,
 195 +                                           PCF50633_REG_LDO1OUT, 14,
 196 +                                           &pcf->standby_regs.ldo[0][0]);
 197 +       if (ret)
 198 +               dev_err(dev, "Failed to restore LDOs :-( %d\n", ret);
 199
 200         mutex_unlock(&pcf->lock);
 201
 202 --
 203 1.5.6.5
 204