ARM: OMAP: Mux update

Sync with linux-omap tree. Improves the locking for pin multiplexing.
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/mach-omap/mux.c

@@ -55,17 +55,11 @@ omap_cfg_reg(const reg_cfg_t reg_cfg)
 
 	cfg = &reg_cfg_table[reg_cfg];
 
-	/*
-	 * We do a pretty long section here with lock on, but pin muxing
-	 * should only happen on driver init for each driver, so it's not time
-	 * critical.
-	 */
-	spin_lock_irqsave(&mux_spin_lock, flags);
-
 	/* Check the mux register in question */
 	if (cfg->mux_reg) {
 		unsigned	tmp1, tmp2;
 
+		spin_lock_irqsave(&mux_spin_lock, flags);
 		reg_orig = omap_readl(cfg->mux_reg);
 
 		/* The mux registers always seem to be 3 bits long */
@@ -80,11 +74,13 @@ omap_cfg_reg(const reg_cfg_t reg_cfg)
 			warn = 1;
 
 		omap_writel(reg, cfg->mux_reg);
+		spin_unlock_irqrestore(&mux_spin_lock, flags);
 	}
 
 	/* Check for pull up or pull down selection on 1610 */
 	if (!cpu_is_omap1510()) {
 		if (cfg->pu_pd_reg && cfg->pull_val) {
+			spin_lock_irqsave(&mux_spin_lock, flags);
 			pu_pd_orig = omap_readl(cfg->pu_pd_reg);
 			mask = 1 << cfg->pull_bit;
 
@@ -100,11 +96,13 @@ omap_cfg_reg(const reg_cfg_t reg_cfg)
 				pu_pd = pu_pd_orig & ~mask;
 			}
 			omap_writel(pu_pd, cfg->pu_pd_reg);
+			spin_unlock_irqrestore(&mux_spin_lock, flags);
 		}
 	}
 
 	/* Check for an associated pull down register */
 	if (cfg->pull_reg) {
+		spin_lock_irqsave(&mux_spin_lock, flags);
 		pull_orig = omap_readl(cfg->pull_reg);
 		mask = 1 << cfg->pull_bit;
 
@@ -121,6 +119,7 @@ omap_cfg_reg(const reg_cfg_t reg_cfg)
 		}
 
 		omap_writel(pull, cfg->pull_reg);
+		spin_unlock_irqrestore(&mux_spin_lock, flags);
 	}
 
 	if (warn) {
@@ -149,8 +148,6 @@ omap_cfg_reg(const reg_cfg_t reg_cfg)
 	}
 #endif
 
-	spin_unlock_irqrestore(&mux_spin_lock, flags);
-
 #ifdef CONFIG_OMAP_MUX_ERRORS
 	return warn ? -ETXTBSY : 0;
 #else

include/asm-arm/arch-omap/mux.h

@@ -332,7 +332,7 @@ typedef enum {
  * Table of various FUNC_MUX and PULL_DWN combinations for each device.
  * See also reg_cfg_t above for the lookup table.
  */
-static reg_cfg_set __initdata_or_module
+static const reg_cfg_set __initdata_or_module
 reg_cfg_table[] = {
 /*
  *	 description		mux  mode   mux	 pull pull  pull  pu_pd	 pu  dbg
@@ -503,7 +503,7 @@ MUX_CFG("Y10_USB0_SUSP",	 B,   3,     5,	  2,  17,   0,	  2,	 0,  1)
 MUX_CFG("W9_USB2_TXEN",		 B,   9,     1,	 NA,   0,   0,	 NA,	 0,  1)
 MUX_CFG("AA9_USB2_VP",		 B,   6,     1,	 NA,   0,   0,	 NA,	 0,  1)
 MUX_CFG("Y5_USB2_RCV",		 C,  21,     1,	 NA,   0,   0,	 NA,	 0,  1)
-MUX_CFG("R8_USB2_VM",		 C,  18,     1,	 NA,   0,   0,	 NA,	 0,  1)
+MUX_CFG("R9_USB2_VM",		 C,  18,     1,	 NA,   0,   0,	 NA,	 0,  1)
 MUX_CFG("V6_USB2_TXD",		 C,  27,     2,	 NA,   0,   0,	 NA,	 0,  1)
 MUX_CFG("W5_USB2_SE0",		 C,  24,     2,	 NA,   0,   0,	 NA,	 0,  1)