diff options
Diffstat (limited to 'target/linux/s3c24xx/patches/0228-fix-allow-full-sd-voltage-range-selection.patch.patch')
| -rwxr-xr-x | target/linux/s3c24xx/patches/0228-fix-allow-full-sd-voltage-range-selection.patch.patch | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/target/linux/s3c24xx/patches/0228-fix-allow-full-sd-voltage-range-selection.patch.patch b/target/linux/s3c24xx/patches/0228-fix-allow-full-sd-voltage-range-selection.patch.patch new file mode 100755 index 0000000000..c10da6ab99 --- /dev/null +++ b/target/linux/s3c24xx/patches/0228-fix-allow-full-sd-voltage-range-selection.patch.patch @@ -0,0 +1,74 @@ +From 0dd4b9a534db9bef8f2901c00ee58b00e14a49df Mon Sep 17 00:00:00 2001 +From: Andy Green <andy@openmoko.com> +Date: Wed, 30 Jul 2008 14:36:42 +0100 +Subject: [PATCH] fix-allow-full-sd-voltage-range-selection.patch + +Until now we just drove the SD Card at 3.3V all the time. But in +fact we can do better, and use a voltage negotiated with the +SD Card itself. + +With the shipping 512MB Sandisk SD Card, 2.7V is negotiated which +gives 1.7dBm reduction in power on all the SD Card lines and should +further reduce GPS perturbation during SD Card usage. + +Signed-off-by: Andy Green <andy@openmoko.com> +--- + arch/arm/mach-s3c2440/mach-gta02.c | 10 ++++------ + drivers/mfd/glamo/glamo-core.c | 13 ++++++++++++- + 2 files changed, 16 insertions(+), 7 deletions(-) + +diff --git a/arch/arm/mach-s3c2440/mach-gta02.c b/arch/arm/mach-s3c2440/mach-gta02.c +index 1fcd3fd..382837d 100644 +--- a/arch/arm/mach-s3c2440/mach-gta02.c ++++ b/arch/arm/mach-s3c2440/mach-gta02.c +@@ -604,7 +604,7 @@ static struct pcf50633_platform_data gta02_pcf_pdata = { + [PCF50633_REGULATOR_HCLDO] = { + .name = "sd_3v3", + .voltage = { +- .init = 3300, ++ .init = 2000, + .max = 3300, + }, + }, +@@ -1378,11 +1378,9 @@ gta02_glamo_mmc_set_power(unsigned char power_mode, unsigned short vdd) + return; + } + /* select and set the voltage */ +- if (vdd > 7) { +- mv += 300 + 100 * (vdd - 8); +- if (mv > 3500) +- mv = 3500; +- } ++ if (vdd > 7) ++ mv += 350 + 100 * (vdd - 8); ++ printk(KERN_INFO "SD power -> %dmV\n", mv); + pcf50633_voltage_set(pcf50633_global, + PCF50633_REGULATOR_HCLDO, mv); + pcf50633_onoff_set(pcf50633_global, +diff --git a/drivers/mfd/glamo/glamo-core.c b/drivers/mfd/glamo/glamo-core.c +index ee33901..cb9b056 100644 +--- a/drivers/mfd/glamo/glamo-core.c ++++ b/drivers/mfd/glamo/glamo-core.c +@@ -270,7 +270,18 @@ static struct platform_device glamo_mmc_dev = { + struct glamo_mci_pdata glamo_mci_def_pdata = { + .gpio_detect = 0, + .glamo_set_mci_power = NULL, /* filled in from MFD platform data */ +- .ocr_avail = MMC_VDD_32_33, ++ .ocr_avail = MMC_VDD_20_21 | ++ MMC_VDD_21_22 | ++ MMC_VDD_22_23 | ++ MMC_VDD_23_24 | ++ MMC_VDD_24_25 | ++ MMC_VDD_25_26 | ++ MMC_VDD_26_27 | ++ MMC_VDD_27_28 | ++ MMC_VDD_28_29 | ++ MMC_VDD_29_30 | ++ MMC_VDD_30_31 | ++ MMC_VDD_32_33, + .glamo_irq_is_wired = NULL, /* filled in from MFD platform data */ + .mci_suspending = NULL, /* filled in from MFD platform data */ + .mci_all_dependencies_resumed = NULL, /* filled in from MFD platform data */ +-- +1.5.6.3 + |