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ARM: OMAP4: MMC: fix power and audio issue, decouple USBC1 from MMC1 

Remove OMAP4_USBC1_ICUSB_PWRDNZ_MASK during enable/disable PWRDNZ mode for
MMC1_PBIAS and associated extended-drain MMC1 I/O cell. This is in accordance
with the control module programming guide. This fixes a bug where if trying to
use gpio_98 or gpio_99 and MMC1 at the same time the GPIO signal will be
affected by a changing SDMMC1_VDDS.

Software must keep MMC1_PBIAS cell and MMC1_IO cell PWRDNZ signals low whenever
SDMMC1_VDDS ramps up/down or changes for cell protection purposes.

MMC1 is based on SDMMC1_VDDS whereas USBC1 is based on SIM_VDDS therefore
they can operate independently.

Signed-off-by: Bryan Buckley <bryan.buckley@ti.com>
Acked-by:  Kishore Kadiyala <kishore.kadiyala@ti.com>
Tested-by: Balaji T K <balajitk@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
This commit is contained in:
Bryan Buckley 2011-09-30 11:05:55 -07:00 committed by Tony Lindgren
parent a102a9ece5
commit 3696d303d6
1 changed files with 4 additions and 8 deletions
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12
arch/arm/mach-omap2/hsmmc.c
View File

@ -137,8 +137,7 @@ static void omap4_hsmmc1_before_set_reg(struct device *dev, int slot,
*/
reg = omap4_ctrl_pad_readl(control_pbias_offset);
reg &= ~(OMAP4_MMC1_PBIASLITE_PWRDNZ_MASK |
OMAP4_MMC1_PWRDNZ_MASK |
OMAP4_USBC1_ICUSB_PWRDNZ_MASK);
OMAP4_MMC1_PWRDNZ_MASK);
omap4_ctrl_pad_writel(reg, control_pbias_offset);
}
@ -156,8 +155,7 @@ static void omap4_hsmmc1_after_set_reg(struct device *dev, int slot,
else
reg |= OMAP4_MMC1_PBIASLITE_VMODE_MASK;
reg |= (OMAP4_MMC1_PBIASLITE_PWRDNZ_MASK |
OMAP4_MMC1_PWRDNZ_MASK |
OMAP4_USBC1_ICUSB_PWRDNZ_MASK);
OMAP4_MMC1_PWRDNZ_MASK);
omap4_ctrl_pad_writel(reg, control_pbias_offset);
timeout = jiffies + msecs_to_jiffies(5);
@ -171,16 +169,14 @@ static void omap4_hsmmc1_after_set_reg(struct device *dev, int slot,
if (reg & OMAP4_MMC1_PBIASLITE_VMODE_ERROR_MASK) {
pr_err("Pbias Voltage is not same as LDO\n");
/* Caution : On VMODE_ERROR Power Down MMC IO */
reg &= ~(OMAP4_MMC1_PWRDNZ_MASK |
OMAP4_USBC1_ICUSB_PWRDNZ_MASK);
reg &= ~(OMAP4_MMC1_PWRDNZ_MASK);
omap4_ctrl_pad_writel(reg, control_pbias_offset);
}
} else {
reg = omap4_ctrl_pad_readl(control_pbias_offset);
reg |= (OMAP4_MMC1_PBIASLITE_PWRDNZ_MASK |
OMAP4_MMC1_PWRDNZ_MASK |
OMAP4_MMC1_PBIASLITE_VMODE_MASK |
OMAP4_USBC1_ICUSB_PWRDNZ_MASK);
OMAP4_MMC1_PBIASLITE_VMODE_MASK);
omap4_ctrl_pad_writel(reg, control_pbias_offset);
}
}