target/linux/s3c24xx/patches-2.6.26/0166-fix-pcf50633-use-i2c-bulk-autoincrement.patch.patch

   1 From cc770a67d483a63e98be55c15f08d97ed5599230 Mon Sep 17 00:00:00 2001
   2 From: Andy Green <andy@openmoko.com>
   3 Date: Fri, 25 Jul 2008 23:06:12 +0100
   4 Subject: [PATCH] fix-pcf50633-use-i2c-bulk-autoincrement.patch
   5
   6 Simplify and speed up bulk sequential I2C actions in pcf50633
   7 the time savings are pretty considerable and so is the simplification
   8
   9 Signed-off-by: Andy Green <andy@openmoko.com>
  10 ---
  11  drivers/i2c/chips/pcf50633.c |  125 +++++++++++++++++++++++++-----------------
  12  1 files changed, 75 insertions(+), 50 deletions(-)
  13
  14 diff --git a/drivers/i2c/chips/pcf50633.c b/drivers/i2c/chips/pcf50633.c
  15 index 0406767..645cbbb 100644
  16 --- a/drivers/i2c/chips/pcf50633.c
  17 +++ b/drivers/i2c/chips/pcf50633.c
  18 @@ -156,14 +156,14 @@ struct pcf50633_data {
  19
  20  #ifdef CONFIG_PM
  21         struct {
  22 -               u_int8_t int1m, int2m, int3m, int4m, int5m;
  23                 u_int8_t ooctim2;
  24 -               u_int8_t autoout, autoena, automxc;
  25 -               u_int8_t down1out, down1mxc;
  26 -               u_int8_t down2out, down2ena;
  27 -               u_int8_t memldoout, memldoena;
  28 -               u_int8_t ledout, ledena, leddim;
  29 -               u_int8_t ldo[__NUM_PCF50633_REGS][2];
  30 +               /* enables are always [1] below
  31 +                * I2C has limit of 32 sequential regs, so done in two lumps
  32 +                * because it covers 33 register extent otherwise
  33 +                */
  34 +               u_int8_t misc[PCF50633_REG_LEDDIM - PCF50633_REG_AUTOOUT + 1];
  35 +               /*  skip 1 reserved reg here */
  36 +               u_int8_t ldo[PCF50633_REG_HCLDOENA - PCF50633_REG_LDO1OUT + 1];
  37         } standby_regs;
  38
  39         struct resume_dependency resume_dependency;
  40 @@ -1734,9 +1734,13 @@ static int pcf50633bl_set_intensity(struct backlight_device *bd)
  41         u_int8_t ledena = 2;
  42         int ret;
  43
  44 -       if (bd->props.power != FB_BLANK_UNBLANK)
  45 -               intensity = 0;
  46 -       if (bd->props.fb_blank != FB_BLANK_UNBLANK)
  47 +       dev_info(&pcf->client.dev, "pcf50633bl_set_intensity\n");
  48 +
  49 +       if (!(reg_read(pcf, PCF50633_REG_LEDENA) & 1))
  50 +               old_intensity = 0;
  51 +
  52 +       if ((bd->props.power != FB_BLANK_UNBLANK) ||
  53 +           (bd->props.fb_blank != FB_BLANK_UNBLANK))
  54                 intensity = 0;
  55
  56         /* The PCF50633 cannot handle LEDOUT = 0 (datasheet p60)
  57 @@ -2211,6 +2215,9 @@ static int pcf50633_suspend(struct device *dev, pm_message_t state)
  58         int i;
  59         int ret;
  60         u_int8_t tmp;
  61 +       u_int8_t res[5];
  62 +
  63 +       dev_err(dev, "pcf50633_suspend\n");
  64
  65         /* we suspend once (!) as late as possible in the suspend sequencing */
  66
  67 @@ -2218,30 +2225,26 @@ static int pcf50633_suspend(struct device *dev, pm_message_t state)
  68                 return 0;
  69
  70         /* The general idea is to power down all unused power supplies,
  71 -        * and then mask all PCF50606 interrup sources but EXTONR, ONKEYF
  72 +        * and then mask all PCF50633 interrupt sources but EXTONR, ONKEYF
  73          * and ALARM */
  74
  75         mutex_lock(&pcf->lock);
  76
  77         /* Save all registers that don't "survive" standby state */
  78         pcf->standby_regs.ooctim2 = __reg_read(pcf, PCF50633_REG_OOCTIM2);
  79 -       pcf->standby_regs.autoout = __reg_read(pcf, PCF50633_REG_AUTOOUT);
  80 -       pcf->standby_regs.autoena = __reg_read(pcf, PCF50633_REG_AUTOENA);
  81 -       pcf->standby_regs.automxc = __reg_read(pcf, PCF50633_REG_AUTOMXC);
  82 -       pcf->standby_regs.down1out = __reg_read(pcf, PCF50633_REG_DOWN1OUT);
  83 -       pcf->standby_regs.down1mxc = __reg_read(pcf, PCF50633_REG_DOWN1MXC);
  84 -       pcf->standby_regs.down2out = __reg_read(pcf, PCF50633_REG_DOWN2OUT);
  85 -       pcf->standby_regs.down2ena = __reg_read(pcf, PCF50633_REG_DOWN2ENA);
  86 -       pcf->standby_regs.memldoout = __reg_read(pcf, PCF50633_REG_MEMLDOOUT);
  87 -       pcf->standby_regs.memldoena = __reg_read(pcf, PCF50633_REG_MEMLDOENA);
  88 -       pcf->standby_regs.ledout = __reg_read(pcf, PCF50633_REG_LEDOUT);
  89 -       pcf->standby_regs.ledena = __reg_read(pcf, PCF50633_REG_LEDENA);
  90 -       pcf->standby_regs.leddim = __reg_read(pcf, PCF50633_REG_LEDDIM);
  91 +
  92 +       ret = i2c_smbus_read_i2c_block_data(&pcf->client,
  93 +                                           PCF50633_REG_AUTOOUT,
  94 +                                           sizeof(pcf->standby_regs.misc),
  95 +                                           &pcf->standby_regs.misc[0]);
  96 +       if (ret != 18)
  97 +               dev_err(dev, "Failed to save misc levels and enables :-(\n");
  98
  99         /* regulator voltages and enable states */
 100         ret = i2c_smbus_read_i2c_block_data(&pcf->client,
 101 -                                           PCF50633_REG_LDO1OUT, 14,
 102 -                                           &pcf->standby_regs.ldo[0][0]);
 103 +                                           PCF50633_REG_LDO1OUT,
 104 +                                           sizeof(pcf->standby_regs.ldo),
 105 +                                           &pcf->standby_regs.ldo[0]);
 106         if (ret != 14)
 107                 dev_err(dev, "Failed to save LDO levels and enables :-(\n");
 108
 109 @@ -2251,11 +2254,16 @@ static int pcf50633_suspend(struct device *dev, pm_message_t state)
 110                         continue;
 111
 112                 dev_dbg(dev, "disabling regulator %u\n", i);
 113 -               /* we cannot use pcf50633_onoff_set() because we're
 114 -                * already under the mutex */
 115 -               tmp = __reg_read(pcf, regulator_registers[i]+1);
 116 -               tmp &= 0xfe;
 117 -               __reg_write(pcf, regulator_registers[i]+1, tmp);
 118 +
 119 +               /* we can save ourselves the read part of a read-modify-write
 120 +                * here because we captured all these already
 121 +                */
 122 +               if (i < 4)
 123 +                       tmp = pcf->standby_regs.misc[i * 4 + 1];
 124 +               else
 125 +                       tmp = pcf->standby_regs.ldo[(i - 4) * 2 + 1];
 126 +
 127 +               __reg_write(pcf, regulator_registers[i] + 1, tmp & 0xfe);
 128         }
 129
 130         /* turn off the backlight */
 131 @@ -2266,11 +2274,14 @@ static int pcf50633_suspend(struct device *dev, pm_message_t state)
 132         /* set interrupt masks so only those sources we want to wake
 133          * us are able to
 134          */
 135 -       __reg_write(pcf, PCF50633_REG_INT1M, ~pcf->pdata->resumers[0]);
 136 -       __reg_write(pcf, PCF50633_REG_INT2M, ~pcf->pdata->resumers[1]);
 137 -       __reg_write(pcf, PCF50633_REG_INT3M, ~pcf->pdata->resumers[2]);
 138 -       __reg_write(pcf, PCF50633_REG_INT4M, ~pcf->pdata->resumers[3]);
 139 -       __reg_write(pcf, PCF50633_REG_INT5M, ~pcf->pdata->resumers[4]);
 140 +       for (i = 0; i < 5; i++)
 141 +               res[i] = ~pcf->pdata->resumers[i];
 142 +
 143 +       ret = i2c_smbus_write_i2c_block_data(&pcf->client,
 144 +                                            PCF50633_REG_INT1M,
 145 +                                            5, &res[0]);
 146 +       if (ret)
 147 +               dev_err(dev, "Failed to set wake masks :-( %d\n", ret);
 148
 149         pcf->have_been_suspended = 1;
 150
 151 @@ -2302,9 +2313,12 @@ EXPORT_SYMBOL_GPL(pcf50633_ready);
 152  void pcf50633_backlight_resume(struct pcf50633_data *pcf)
 153  {
 154         /* we force the backlight on in fact */
 155 -       __reg_write(pcf, PCF50633_REG_LEDOUT, pcf->standby_regs.ledout);
 156 -       __reg_write(pcf, PCF50633_REG_LEDENA, pcf->standby_regs.ledena | 0x01);
 157 -       __reg_write(pcf, PCF50633_REG_LEDDIM, pcf->standby_regs.leddim);
 158 +       __reg_write(pcf, PCF50633_REG_LEDOUT, pcf->standby_regs.misc[
 159 +                                  PCF50633_REG_LEDOUT - PCF50633_REG_AUTOOUT]);
 160 +       __reg_write(pcf, PCF50633_REG_LEDENA, pcf->standby_regs.misc[
 161 +                              PCF50633_REG_LEDENA - PCF50633_REG_AUTOOUT] | 1);
 162 +       __reg_write(pcf, PCF50633_REG_LEDDIM, pcf->standby_regs.misc[
 163 +                                  PCF50633_REG_LEDDIM - PCF50633_REG_AUTOOUT]);
 164  }
 165  EXPORT_SYMBOL_GPL(pcf50633_backlight_resume);
 166
 167 @@ -2314,7 +2328,10 @@ static int pcf50633_resume(struct device *dev)
 168         struct i2c_client *client = to_i2c_client(dev);
 169         struct pcf50633_data *pcf = i2c_get_clientdata(client);
 170         int ret;
 171 +       u8 res[5];
 172
 173 +       dev_info(dev, "pcf50633_resume suspended on entry = %d\n",
 174 +                                                     pcf->have_been_suspended);
 175         mutex_lock(&pcf->lock);
 176
 177         pcf->have_been_suspended = 2; /* resuming */
 178 @@ -2322,14 +2339,14 @@ static int pcf50633_resume(struct device *dev)
 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 -       __reg_write(pcf, PCF50633_REG_AUTOMXC, pcf->standby_regs.automxc);
 184 -       __reg_write(pcf, PCF50633_REG_DOWN1OUT, pcf->standby_regs.down1out);
 185 -       __reg_write(pcf, PCF50633_REG_DOWN1MXC, pcf->standby_regs.down1mxc);
 186 -       __reg_write(pcf, PCF50633_REG_DOWN2OUT, pcf->standby_regs.down2out);
 187 -       __reg_write(pcf, PCF50633_REG_DOWN2ENA, pcf->standby_regs.down2ena);
 188 -       __reg_write(pcf, PCF50633_REG_MEMLDOOUT, pcf->standby_regs.memldoout);
 189 -       __reg_write(pcf, PCF50633_REG_MEMLDOENA, pcf->standby_regs.memldoena);
 190 +
 191 +       /* regulator voltages and enable states */
 192 +       ret = i2c_smbus_write_i2c_block_data(&pcf->client,
 193 +                                            PCF50633_REG_AUTOOUT,
 194 +                                            sizeof(pcf->standby_regs.misc) - 4,
 195 +                                            &pcf->standby_regs.misc[0]);
 196 +       if (ret)
 197 +               dev_err(dev, "Failed to restore misc :-( %d\n", ret);
 198
 199         /* platform can choose to defer backlight bringup */
 200         if (!pcf->pdata->defer_resume_backlight)
 201 @@ -2337,14 +2354,22 @@ static int pcf50633_resume(struct device *dev)
 202
 203         /* regulator voltages and enable states */
 204         ret = i2c_smbus_write_i2c_block_data(&pcf->client,
 205 -                                           PCF50633_REG_LDO1OUT, 14,
 206 -                                           &pcf->standby_regs.ldo[0][0]);
 207 +                                            PCF50633_REG_LDO1OUT,
 208 +                                            sizeof(pcf->standby_regs.ldo),
 209 +                                            &pcf->standby_regs.ldo[0]);
 210         if (ret)
 211                 dev_err(dev, "Failed to restore LDOs :-( %d\n", ret);
 212
 213 -       mutex_unlock(&pcf->lock);
 214 +       memset(res, 0, sizeof(res));
 215 +       ret = i2c_smbus_write_i2c_block_data(&pcf->client,
 216 +                                            PCF50633_REG_INT1M,
 217 +                                            5, &res[0]);
 218 +       if (ret)
 219 +               dev_err(dev, "Failed to set int masks :-( %d\n", ret);
 220
 221 -       pcf50633_irq(pcf->irq, pcf);
 222 +       pcf->have_been_suspended = 3; /* resume completed */
 223 +
 224 +       mutex_unlock(&pcf->lock);
 225
 226         callback_all_resume_dependencies(&pcf->resume_dependency);
 227
 228 --
 229 1.5.6.3
 230