OMAP2+: clock: remove the DPLL rate tolerance code

Remove the DPLL rate tolerance code that is called during rate
rounding.  As far as I know, this code is never used, since it's been
more important for callers of the DPLL round_rate()/set_rate()
functions to obtain an exact rate than it is to save a relatively
small amount of power.

Signed-off-by: Paul Walmsley <paul@pwsan.com>

6 files changed, 24 insertions, 86 deletions

diff --git a/arch/arm/mach-omap2/clkt_dpll.c b/arch/arm/mach-omap2/clkt_dpll.c
index 337392c3f549..17735e7f47b1 100644
--- a/arch/arm/mach-omap2/clkt_dpll.c
+++ b/arch/arm/mach-omap2/clkt_dpll.c
@@ -178,12 +178,11 @@ void omap2_init_dpll_parent(struct clk *clk)
         if (!dd)
                 return;
 
-        /* Return bypass rate if DPLL is bypassed */
         v = __raw_readl(dd->control_reg);
         v &= dd->enable_mask;
         v >>= __ffs(dd->enable_mask);
 
-        /* Reparent in case the dpll is in bypass */
+        /* Reparent the struct clk in case the dpll is in bypass */
         if (cpu_is_omap24xx()) {
                 if (v == OMAP2XXX_EN_DPLL_LPBYPASS ||
                     v == OMAP2XXX_EN_DPLL_FRBYPASS)
@@ -260,50 +259,22 @@ u32 omap2_get_dpll_rate(struct clk *clk)
 /* DPLL rate rounding code */
 
 /**
- * omap2_dpll_set_rate_tolerance: set the error tolerance during rate rounding
- * @clk: struct clk * of the DPLL
- * @tolerance: maximum rate error tolerance
- *
- * Set the maximum DPLL rate error tolerance for the rate rounding
- * algorithm.  The rate tolerance is an attempt to balance DPLL power
- * saving (the least divider value "n") vs. rate fidelity (the least
- * difference between the desired DPLL target rate and the rounded
- * rate out of the algorithm).  So, increasing the tolerance is likely
- * to decrease DPLL power consumption and increase DPLL rate error.
- * Returns -EINVAL if provided a null clock ptr or a clk that is not a
- * DPLL; or 0 upon success.
- */
-int omap2_dpll_set_rate_tolerance(struct clk *clk, unsigned int tolerance)
-{
-        if (!clk || !clk->dpll_data)
-                return -EINVAL;
-
-        clk->dpll_data->rate_tolerance = tolerance;
-
-        return 0;
-}
-
-/**
  * omap2_dpll_round_rate - round a target rate for an OMAP DPLL
  * @clk: struct clk * for a DPLL
  * @target_rate: desired DPLL clock rate
  *
- * Given a DPLL, a desired target rate, and a rate tolerance, round
- * the target rate to a possible, programmable rate for this DPLL.
- * Rate tolerance is assumed to be set by the caller before this
- * function is called.  Attempts to select the minimum possible n
- * within the tolerance to reduce power consumption.  Stores the
- * computed (m, n) in the DPLL's dpll_data structure so set_rate()
- * will not need to call this (expensive) function again.  Returns ~0
- * if the target rate cannot be rounded, either because the rate is
- * too low or because the rate tolerance is set too tightly; or the
- * rounded rate upon success.
+ * Given a DPLL and a desired target rate, round the target rate to a
+ * possible, programmable rate for this DPLL.  Attempts to select the
+ * minimum possible n.  Stores the computed (m, n) in the DPLL's
+ * dpll_data structure so set_rate() will not need to call this
+ * (expensive) function again.  Returns ~0 if the target rate cannot
+ * be rounded, or the rounded rate upon success.
  */
 long omap2_dpll_round_rate(struct clk *clk, unsigned long target_rate)
 {
-        int m, n, r, e, scaled_max_m;
-        unsigned long scaled_rt_rp, new_rate;
-        int min_e = -1, min_e_m = -1, min_e_n = -1;
+        int m, n, r, scaled_max_m;
+        unsigned long scaled_rt_rp;
+        unsigned long new_rate = 0;
         struct dpll_data *dd;
 
         if (!clk || !clk->dpll_data)
@@ -311,8 +282,8 @@ long omap2_dpll_round_rate(struct clk *clk, unsigned long target_rate)
 
         dd = clk->dpll_data;
 
-        pr_debug("clock: starting DPLL round_rate for clock %s, target rate "
-                 "%ld\n", clk->name, target_rate);
+        pr_debug("clock: %s: starting DPLL round_rate, target rate %ld\n",
+                 clk->name, target_rate);
 
         scaled_rt_rp = target_rate / (dd->clk_ref->rate / DPLL_SCALE_FACTOR);
         scaled_max_m = dd->max_multiplier * DPLL_SCALE_FACTOR;
@@ -347,39 +318,23 @@ long omap2_dpll_round_rate(struct clk *clk, unsigned long target_rate)
                 if (r == DPLL_MULT_UNDERFLOW)
                         continue;
 
-                e = target_rate - new_rate;
-                pr_debug("clock: n = %d: m = %d: rate error is %d "
-                         "(new_rate = %ld)\n", n, m, e, new_rate);
-
-                if (min_e == -1 ||
-                    min_e >= (int)(abs(e) - dd->rate_tolerance)) {
-                        min_e = e;
-                        min_e_m = m;
-                        min_e_n = n;
-
-                        pr_debug("clock: found new least error %d\n", min_e);
+                pr_debug("clock: %s: m = %d: n = %d: new_rate = %ld\n",
+                         clk->name, m, n, new_rate);
 
-                        /* We found good settings -- bail out now */
-                        if (min_e <= dd->rate_tolerance)
-                                break;
+                if (target_rate == new_rate) {
+                        dd->last_rounded_m = m;
+                        dd->last_rounded_n = n;
+                        dd->last_rounded_rate = target_rate;
+                        break;
                 }
         }
 
-        if (min_e < 0) {
-                pr_debug("clock: error: target rate or tolerance too low\n");
+        if (target_rate != new_rate) {
+                pr_debug("clock: %s: cannot round to rate %ld\n", clk->name,
+                         target_rate);
                 return ~0;
         }
 
-        dd->last_rounded_m = min_e_m;
-        dd->last_rounded_n = min_e_n;
-        dd->last_rounded_rate = _dpll_compute_new_rate(dd->clk_ref->rate,
-                                                       min_e_m,  min_e_n);
-
-        pr_debug("clock: final least error: e = %d, m = %d, n = %d\n",
-                 min_e, min_e_m, min_e_n);
-        pr_debug("clock: final rate: %ld  (target rate: %ld)\n",
-                 dd->last_rounded_rate, target_rate);
-
-        return dd->last_rounded_rate;
+        return target_rate;
 }
 
diff --git a/arch/arm/mach-omap2/clock.h b/arch/arm/mach-omap2/clock.h
index 70f8b073e69f..62cfd6cc7461 100644
--- a/arch/arm/mach-omap2/clock.h
+++ b/arch/arm/mach-omap2/clock.h
@@ -18,9 +18,6 @@
 
 #include <plat/clock.h>
 
-/* The maximum error between a target DPLL rate and the rounded rate in Hz */
-#define DEFAULT_DPLL_RATE_TOLERANCE     50000
-
 /* CM_CLKSEL2_PLL.CORE_CLK_SRC bits (2XXX) */
 #define CORE_CLK_SRC_32K                0x0
 #define CORE_CLK_SRC_DPLL               0x1
@@ -55,7 +52,6 @@ void omap2_clk_disable(struct clk *clk);
 long omap2_clk_round_rate(struct clk *clk, unsigned long rate);
 int omap2_clk_set_rate(struct clk *clk, unsigned long rate);
 int omap2_clk_set_parent(struct clk *clk, struct clk *new_parent);
-int omap2_dpll_set_rate_tolerance(struct clk *clk, unsigned int tolerance);
 long omap2_dpll_round_rate(struct clk *clk, unsigned long target_rate);
 unsigned long omap3_dpll_recalc(struct clk *clk);
 unsigned long omap3_clkoutx2_recalc(struct clk *clk);
diff --git a/arch/arm/mach-omap2/clock2420_data.c b/arch/arm/mach-omap2/clock2420_data.c
index 6e9d20dc8649..22eeafc89b9f 100644
--- a/arch/arm/mach-omap2/clock2420_data.c
+++ b/arch/arm/mach-omap2/clock2420_data.c
@@ -116,7 +116,6 @@ static struct dpll_data dpll_dd = {
         .max_multiplier         = 1023,
         .min_divider            = 1,
         .max_divider            = 16,
-        .rate_tolerance         = DEFAULT_DPLL_RATE_TOLERANCE
 };
 
 /*
diff --git a/arch/arm/mach-omap2/clock2430_data.c b/arch/arm/mach-omap2/clock2430_data.c
index 3378dbf8bace..df4cac5fef06 100644
--- a/arch/arm/mach-omap2/clock2430_data.c
+++ b/arch/arm/mach-omap2/clock2430_data.c
@@ -116,7 +116,6 @@ static struct dpll_data dpll_dd = {
         .max_multiplier         = 1023,
         .min_divider            = 1,
         .max_divider            = 16,
-        .rate_tolerance         = DEFAULT_DPLL_RATE_TOLERANCE
 };
 
 /*
diff --git a/arch/arm/mach-omap2/clock3xxx_data.c b/arch/arm/mach-omap2/clock3xxx_data.c
index 305b5f75c44f..3dbeb3a5813d 100644
--- a/arch/arm/mach-omap2/clock3xxx_data.c
+++ b/arch/arm/mach-omap2/clock3xxx_data.c
@@ -291,7 +291,6 @@ static struct dpll_data dpll1_dd = {
         .max_multiplier = OMAP3_MAX_DPLL_MULT,
         .min_divider    = 1,
         .max_divider    = OMAP3_MAX_DPLL_DIV,
-        .rate_tolerance = DEFAULT_DPLL_RATE_TOLERANCE
 };
 
 static struct clk dpll1_ck = {
@@ -364,7 +363,6 @@ static struct dpll_data dpll2_dd = {
         .max_multiplier = OMAP3_MAX_DPLL_MULT,
         .min_divider    = 1,
         .max_divider    = OMAP3_MAX_DPLL_DIV,
-        .rate_tolerance = DEFAULT_DPLL_RATE_TOLERANCE
 };
 
 static struct clk dpll2_ck = {
@@ -424,7 +422,6 @@ static struct dpll_data dpll3_dd = {
         .max_multiplier = OMAP3_MAX_DPLL_MULT,
         .min_divider    = 1,
         .max_divider    = OMAP3_MAX_DPLL_DIV,
-        .rate_tolerance = DEFAULT_DPLL_RATE_TOLERANCE
 };
 
 static struct clk dpll3_ck = {
@@ -583,7 +580,6 @@ static struct dpll_data dpll4_dd_34xx __initdata = {
         .max_multiplier = OMAP3_MAX_DPLL_MULT,
         .min_divider    = 1,
         .max_divider    = OMAP3_MAX_DPLL_DIV,
-        .rate_tolerance = DEFAULT_DPLL_RATE_TOLERANCE
 };
 
 static struct dpll_data dpll4_dd_3630 __initdata = {
@@ -607,7 +603,6 @@ static struct dpll_data dpll4_dd_3630 __initdata = {
         .max_multiplier = OMAP3630_MAX_JTYPE_DPLL_MULT,
         .min_divider    = 1,
         .max_divider    = OMAP3_MAX_DPLL_DIV,
-        .rate_tolerance = DEFAULT_DPLL_RATE_TOLERANCE,
         .flags          = DPLL_J_TYPE
 };
 
@@ -939,7 +934,6 @@ static struct dpll_data dpll5_dd = {
         .max_multiplier = OMAP3_MAX_DPLL_MULT,
         .min_divider    = 1,
         .max_divider    = OMAP3_MAX_DPLL_DIV,
-        .rate_tolerance = DEFAULT_DPLL_RATE_TOLERANCE
 };
 
 static struct clk dpll5_ck = {
diff --git a/arch/arm/plat-omap/include/plat/clock.h b/arch/arm/plat-omap/include/plat/clock.h
index dcd7bb81420d..006e599c6613 100644
--- a/arch/arm/plat-omap/include/plat/clock.h
+++ b/arch/arm/plat-omap/include/plat/clock.h
@@ -109,7 +109,6 @@ struct clksel {
  * @clk_ref: struct clk pointer to the clock's reference clock input
  * @control_reg: register containing the DPLL mode bitfield
  * @enable_mask: mask of the DPLL mode bitfield in @control_reg
- * @rate_tolerance: maximum variance allowed from target rate (in Hz)
  * @last_rounded_rate: cache of the last rate result of omap2_dpll_round_rate()
  * @last_rounded_m: cache of the last M result of omap2_dpll_round_rate()
  * @max_multiplier: maximum valid non-bypass multiplier value (actual)
@@ -135,12 +134,9 @@ struct clksel {
  * XXX Some DPLLs have multiple bypass inputs, so it's not technically
  * correct to only have one @clk_bypass pointer.
  *
- * XXX @rate_tolerance should probably be deprecated - currently there
- * don't seem to be any usecases for DPLL rounding that is not exact.
- *
  * XXX The runtime-variable fields (@last_rounded_rate, @last_rounded_m,
  * @last_rounded_n) should be separated from the runtime-fixed fields
- * and placed into a differenct structure, so that the runtime-fixed data
+ * and placed into a different structure, so that the runtime-fixed data
  * can be placed into read-only space.
  */
 struct dpll_data {
@@ -151,7 +147,6 @@ struct dpll_data {
         struct clk              *clk_ref;
         void __iomem            *control_reg;
         u32                     enable_mask;
-        unsigned int            rate_tolerance;
         unsigned long           last_rounded_rate;
         u16                     last_rounded_m;
         u16                     max_multiplier;