target/linux/s3c24xx/patches-2.6.26/1173-fix-pcf50633-kill-white-splash-of-death-on-suspend.p.patch

   1 From df0a2db3e96b39e9cd48acb069f2e60919be49f9 Mon Sep 17 00:00:00 2001
   2 From: Andy Green <andy@openmoko.com>
   3 Date: Fri, 25 Jul 2008 23:06:14 +0100
   4 Subject: [PATCH] fix-pcf50633-kill-white-splash-of-death-on-suspend.patch
   5
   6 mach-gta02 meddles with the regulator platform struct after
   7 it is defined, leading to LCM power getting lost in suspend
   8 despite I set it to be left up.  Fixing this finally removes
   9 the incredibly stubborn white LCM on suspend "flash".
  10
  11 This is also going to be implicated in Sean McNeil's
  12 experience of monochromatic LCM after resume, which was
  13 previously attacked by resetting and re-initing the LCM
  14 from scratch.
  15
  16 In addition, I realized that we take down core_1v3 in
  17 pcf50633 suspend action, this is happening near the
  18 start of suspend, so we are in a meta-race to finish
  19 suspend in a controlled way before the caps on core_1v3
  20 run out (I only saw 23.3uF total).  If it's true, this
  21 is where the weirdo sensitivity to timing during
  22 suspend is coming from.
  23
  24 Therefore in this patch we also remove sleeps and
  25 dev_info() etc (which have to flush on serial console)
  26 from the pc50633 isr workqueue if we are in pcf50633
  27 driver suspend state 1, ie, suspending... because we
  28 don't have time for it.
  29
  30 Signed-off-by: Andy Green <andy@openmoko.com>
  31 ---
  32  arch/arm/mach-s3c2440/mach-gta02.c |   43 ++++++++++++++++++++++++++----------
  33  drivers/i2c/chips/pcf50633.c       |   29 ++++++++++++-----------
  34  drivers/mfd/glamo/glamo-core.c     |    2 +
  35  drivers/video/display/jbt6k74.c    |    1 +
  36  4 files changed, 49 insertions(+), 26 deletions(-)
  37
  38 diff --git a/arch/arm/mach-s3c2440/mach-gta02.c b/arch/arm/mach-s3c2440/mach-gta02.c
  39 index 654dc8f..0bacafa 100644
  40 --- a/arch/arm/mach-s3c2440/mach-gta02.c
  41 +++ b/arch/arm/mach-s3c2440/mach-gta02.c
  42 @@ -485,6 +485,9 @@ static struct pcf50633_platform_data gta02_pcf_pdata = {
  43                 [1] = PCF50633_INT2_ONKEYF,
  44                 [2] = PCF50633_INT3_ONKEY1S
  45         },
  46 +       /* warning: these get rewritten during machine init below
  47 +        * depending on pcb variant
  48 +        */
  49         .rails  = {
  50                 [PCF50633_REGULATOR_AUTO] = {
  51                         .name           = "io_3v3",
  52 @@ -496,6 +499,12 @@ static struct pcf50633_platform_data gta02_pcf_pdata = {
  53                 },
  54                 [PCF50633_REGULATOR_DOWN1] = {
  55                         .name           = "core_1v3",
  56 +                       /* Wow, when we are going into suspend, after pcf50633
  57 +                        * runs its suspend (which happens real early since it
  58 +                        * is an i2c device) we are running out of the 22uF cap
  59 +                        * on core_1v3 rail !!!!
  60 +                        */
  61 +                       .flags          = PMU_VRAIL_F_SUSPEND_ON,
  62                         .voltage        = {
  63                                 .init   = 1300,
  64                                 .max    = 1600,
  65 @@ -503,6 +512,7 @@ static struct pcf50633_platform_data gta02_pcf_pdata = {
  66                 },
  67                 [PCF50633_REGULATOR_DOWN2] = {
  68                         .name           = "core_1v8",
  69 +                       .flags          = PMU_VRAIL_F_SUSPEND_ON,
  70                         .voltage        = {
  71                                 .init   = 1800,
  72                                 .max    = 1800,
  73 @@ -516,8 +526,7 @@ static struct pcf50633_platform_data gta02_pcf_pdata = {
  74                         },
  75                 },
  76                 [PCF50633_REGULATOR_LDO1] = {
  77 -                       .name           = "stby_1v3",
  78 -                       .flags          = PMU_VRAIL_F_SUSPEND_ON,
  79 +                       .name           = "gsensor_3v3",
  80                         .voltage        = {
  81                                 .init   = 1300,
  82                                 .max    = 1330,
  83 @@ -531,7 +540,7 @@ static struct pcf50633_platform_data gta02_pcf_pdata = {
  84                         },
  85                 },
  86                 [PCF50633_REGULATOR_LDO3] = {
  87 -                       .name           = "lcm_3v",
  88 +                       .name           = "unused3",
  89                         .voltage        = {
  90                                 .init   = 3000,
  91                                 .max    = 3000,
  92 @@ -545,20 +554,28 @@ static struct pcf50633_platform_data gta02_pcf_pdata = {
  93                         },
  94                 },
  95                 [PCF50633_REGULATOR_LDO5] = {
  96 -                       .name           = "gl_1v5",
  97 +                       .name           = "rf3v",
  98                         .voltage        = {
  99                                 .init   = 1500,
 100                                 .max    = 1500,
 101                         },
 102                 },
 103                 [PCF50633_REGULATOR_LDO6] = {
 104 -                       .name           = "user1",
 105 +                       .name           = "lcm_3v",
 106                         .flags = PMU_VRAIL_F_SUSPEND_ON,
 107                         .voltage        = {
 108                                 .init   = 0,
 109                                 .max    = 3300,
 110                         },
 111                 },
 112 +               [PCF50633_REGULATOR_MEMLDO] = {
 113 +                       .name           = "memldo",
 114 +                       .flags = PMU_VRAIL_F_SUSPEND_ON,
 115 +                       .voltage        = {
 116 +                               .init   = 1800,
 117 +                               .max    = 1800,
 118 +                       },
 119 +               },
 120         },
 121         .defer_resume_backlight = 1,
 122  };
 123 @@ -611,13 +628,15 @@ static void mangle_pmu_pdata_by_system_rev(void)
 124                                                                 .max = 3000,
 125                                                         }
 126                                                 });
 127 -               gta02_pcf_pdata.rails[PCF50633_REGULATOR_LDO6] = ((struct pmu_voltage_rail) {
 128 -                                                       .name = "lcm_3v",
 129 -                                                       .voltage = {
 130 -                                                               .init = 3000,
 131 -                                                               .max = 3000,
 132 -                                                       }
 133 -                                               });
 134 +               gta02_pcf_pdata.rails[PCF50633_REGULATOR_LDO6] =
 135 +                                       ((struct pmu_voltage_rail) {
 136 +                                               .name = "lcm_3v",
 137 +                                               .flags = PMU_VRAIL_F_SUSPEND_ON,
 138 +                                               .voltage = {
 139 +                                                       .init = 3000,
 140 +                                                       .max = 3000,
 141 +                                               }
 142 +                                       });
 143                 break;
 144         default:
 145                 break;
 146 diff --git a/drivers/i2c/chips/pcf50633.c b/drivers/i2c/chips/pcf50633.c
 147 index 4002c03..37dfca6 100644
 148 --- a/drivers/i2c/chips/pcf50633.c
 149 +++ b/drivers/i2c/chips/pcf50633.c
 150 @@ -750,9 +750,6 @@ static void pcf50633_work(struct work_struct *work)
 151         mutex_lock(&pcf->working_lock);
 152         pcf->working = 1;
 153
 154 -       dev_info(&pcf->client.dev, "pcf50633_work called with suspended = %d\n",
 155 -                                  pcf->have_been_suspended);
 156 -
 157         /*
 158          * If we are inside suspend -> resume completion time we don't attempt
 159          * service until we have fully resumed.  Although we could talk to the
 160 @@ -763,11 +760,8 @@ static void pcf50633_work(struct work_struct *work)
 161          * completed.
 162          */
 163
 164 -       if (pcf->have_been_suspended && (pcf->have_been_suspended < 3)) {
 165 -               dev_info(&pcf->client.dev, "rescheduling,  suspended = %d\n",
 166 -                                          pcf->have_been_suspended);
 167 +       if (pcf->have_been_suspended && (pcf->have_been_suspended < 3))
 168                 goto reschedule;
 169 -       }
 170
 171         /*
 172          * datasheet says we have to read the five IRQ
 173 @@ -1157,9 +1151,13 @@ static void pcf50633_work(struct work_struct *work)
 174
 175  reschedule:
 176         /* don't spew, delaying whatever else is happening */
 177 -       msleep(100);
 178 -
 179 -       dev_info(&pcf->client.dev, "rescheduling interrupt service\n");
 180 +       /* EXCEPTION: if we are in the middle of suspending, we don't have
 181 +        * time to hang around since we may be turned off core 1V3 already
 182 +        */
 183 +       if (pcf->have_been_suspended != 1) {
 184 +               msleep(50);
 185 +               dev_info(&pcf->client.dev, "rescheduling interrupt service\n");
 186 +       }
 187         if (!schedule_work(&pcf->work))
 188                 dev_err(&pcf->client.dev, "int service reschedule failed\n");
 189
 190 @@ -2333,7 +2331,7 @@ static int pcf50633_suspend(struct device *dev, pm_message_t state)
 191                                             PCF50633_REG_AUTOOUT,
 192                                             sizeof(pcf->standby_regs.misc),
 193                                             &pcf->standby_regs.misc[0]);
 194 -       if (ret != 18)
 195 +       if (ret != sizeof(pcf->standby_regs.misc))
 196                 dev_err(dev, "Failed to save misc levels and enables :-(\n");
 197
 198         /* regulator voltages and enable states */
 199 @@ -2341,7 +2339,7 @@ static int pcf50633_suspend(struct device *dev, pm_message_t state)
 200                                             PCF50633_REG_LDO1OUT,
 201                                             sizeof(pcf->standby_regs.ldo),
 202                                             &pcf->standby_regs.ldo[0]);
 203 -       if (ret != 14)
 204 +       if (ret != sizeof(pcf->standby_regs.ldo))
 205                 dev_err(dev, "Failed to save LDO levels and enables :-(\n");
 206
 207         /* switch off power supplies that are not needed during suspend */
 208 @@ -2349,8 +2347,6 @@ static int pcf50633_suspend(struct device *dev, pm_message_t state)
 209                 if ((pcf->pdata->rails[i].flags & PMU_VRAIL_F_SUSPEND_ON))
 210                         continue;
 211
 212 -               dev_dbg(dev, "disabling regulator %u\n", i);
 213 -
 214                 /* we can save ourselves the read part of a read-modify-write
 215                  * here because we captured all these already
 216                  */
 217 @@ -2359,6 +2355,11 @@ static int pcf50633_suspend(struct device *dev, pm_message_t state)
 218                 else
 219                         tmp = pcf->standby_regs.ldo[(i - 4) * 2 + 1];
 220
 221 +               dev_info(dev, "disabling reg %s by setting ENA %d to 0x%02X\n",
 222 +                             pcf->pdata->rails[i].name,
 223 +                             regulator_registers[i] + 1, tmp & 0xfe);
 224 +
 225 +               /* associated enable is always +1 from OUT reg */
 226                 __reg_write(pcf, regulator_registers[i] + 1, tmp & 0xfe);
 227         }
 228
 229 diff --git a/drivers/mfd/glamo/glamo-core.c b/drivers/mfd/glamo/glamo-core.c
 230 index 3edbfa8..d4b526d 100644
 231 --- a/drivers/mfd/glamo/glamo-core.c
 232 +++ b/drivers/mfd/glamo/glamo-core.c
 233 @@ -848,6 +848,7 @@ static void glamo_power(struct glamo_core *glamo,
 234                                  ARRAY_SIZE(glamo_resume_script), 0);
 235
 236                 break;
 237 +
 238         case GLAMO_POWER_STANDBY:
 239                 /* enable memory self-refresh */
 240                 __reg_set_bit_mask(glamo, GLAMO_REG_MEM_DRAM1,
 241 @@ -859,6 +860,7 @@ static void glamo_power(struct glamo_core *glamo,
 242                 __reg_set_bit_mask(glamo, GLAMO_REG_PLL_GEN3, 0x2000, 0xffff);
 243                 __reg_set_bit_mask(glamo, GLAMO_REG_DFT_GEN5, 0x0001, 0xffff);
 244                 break;
 245 +
 246         case GLAMO_POWER_SUSPEND:
 247                 __reg_set_bit_mask(glamo, GLAMO_REG_MEM_DRAM2,
 248                                    GLAMO_MEM_DRAM2_DEEP_PWRDOWN, 0xffff);
 249 diff --git a/drivers/video/display/jbt6k74.c b/drivers/video/display/jbt6k74.c
 250 index 6fa1fe7..b406298 100644
 251 --- a/drivers/video/display/jbt6k74.c
 252 +++ b/drivers/video/display/jbt6k74.c
 253 @@ -634,6 +634,7 @@ static int jbt_suspend(struct spi_device *spi, pm_message_t state)
 254
 255         /* Save mode for resume */
 256         jbt->last_state = jbt->state;
 257 +
 258         jbt6k74_enter_state(jbt, JBT_STATE_DEEP_STANDBY);
 259
 260         jbt->have_resumed = 0;
 261 --
 262 1.5.6.3
 263