target/linux/s3c24xx/patches-2.6.24/1248-fix-allow-full-sd-voltage-range-selection.patch.patch

   1 From 00e20ff234e6d35a6df7e86c043fdda7da06bf04 Mon Sep 17 00:00:00 2001
   2 From: Andy Green <andy@openmoko.com>
   3 Date: Wed, 30 Jul 2008 12:43:25 +0100
   4 Subject: [PATCH] fix-allow-full-sd-voltage-range-selection.patch
   5
   6 Until now we just drove the SD Card at 3.3V all the time.  But in
   7 fact we can do better, and use a voltage negotiated with the
   8 SD Card itself.
   9
  10 With the shipping 512MB Sandisk SD Card, 2.7V is negotiated which
  11 gives 1.7dBm reduction in power on all the SD Card lines and should
  12 further reduce GPS perturbation during SD Card usage.
  13
  14 Signed-off-by: Andy Green <andy@openmoko.com>
  15 ---
  16  arch/arm/mach-s3c2440/mach-gta02.c |   10 ++++------
  17  drivers/mfd/glamo/glamo-core.c     |   13 ++++++++++++-
  18  2 files changed, 16 insertions(+), 7 deletions(-)
  19
  20 diff --git a/arch/arm/mach-s3c2440/mach-gta02.c b/arch/arm/mach-s3c2440/mach-gta02.c
  21 index 1fcd3fd..382837d 100644
  22 --- a/arch/arm/mach-s3c2440/mach-gta02.c
  23 +++ b/arch/arm/mach-s3c2440/mach-gta02.c
  24 @@ -604,7 +604,7 @@ static struct pcf50633_platform_data gta02_pcf_pdata = {
  25                 [PCF50633_REGULATOR_HCLDO] = {
  26                         .name           = "sd_3v3",
  27                         .voltage        = {
  28 -                               .init   = 3300,
  29 +                               .init   = 2000,
  30                                 .max    = 3300,
  31                         },
  32                 },
  33 @@ -1378,11 +1378,9 @@ gta02_glamo_mmc_set_power(unsigned char power_mode, unsigned short vdd)
  34                                 return;
  35                         }
  36                         /* select and set the voltage */
  37 -                       if (vdd > 7) {
  38 -                               mv += 300 + 100 * (vdd - 8);
  39 -                               if (mv > 3500)
  40 -                                       mv = 3500;
  41 -                       }
  42 +                       if (vdd > 7)
  43 +                               mv += 350 + 100 * (vdd - 8);
  44 +                       printk(KERN_INFO "SD power -> %dmV\n", mv);
  45                         pcf50633_voltage_set(pcf50633_global,
  46                                              PCF50633_REGULATOR_HCLDO, mv);
  47                         pcf50633_onoff_set(pcf50633_global,
  48 diff --git a/drivers/mfd/glamo/glamo-core.c b/drivers/mfd/glamo/glamo-core.c
  49 index bea0387..f411446 100644
  50 --- a/drivers/mfd/glamo/glamo-core.c
  51 +++ b/drivers/mfd/glamo/glamo-core.c
  52 @@ -270,7 +270,18 @@ static struct platform_device glamo_mmc_dev = {
  53  struct glamo_mci_pdata glamo_mci_def_pdata = {
  54         .gpio_detect            = 0,
  55         .glamo_set_mci_power    = NULL, /* filled in from MFD platform data */
  56 -       .ocr_avail              = MMC_VDD_32_33,
  57 +       .ocr_avail      = MMC_VDD_20_21 |
  58 +                         MMC_VDD_21_22 |
  59 +                         MMC_VDD_22_23 |
  60 +                         MMC_VDD_23_24 |
  61 +                         MMC_VDD_24_25 |
  62 +                         MMC_VDD_25_26 |
  63 +                         MMC_VDD_26_27 |
  64 +                         MMC_VDD_27_28 |
  65 +                         MMC_VDD_28_29 |
  66 +                         MMC_VDD_29_30 |
  67 +                         MMC_VDD_30_31 |
  68 +                         MMC_VDD_32_33,
  69         .glamo_irq_is_wired     = NULL, /* filled in from MFD platform data */
  70         .mci_suspending = NULL, /* filled in from MFD platform data */
  71         .mci_all_dependencies_resumed = NULL, /* filled in from MFD plat data */
  72 --
  73 1.5.6.5
  74