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>

1 files changed, 4 insertions, 8 deletions

diff --git a/arch/arm/mach-omap2/hsmmc.c b/arch/arm/mach-omap2/hsmmc.c
index a9b45c76e1d3..097a42d81e59 100644
--- a/arch/arm/mach-omap2/hsmmc.c
+++ b/arch/arm/mach-omap2/hsmmc.c
@@ -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);
         }
 }