Use the PM-WIP-OPP branch apis for generating the opp list for DSP.
This allows for scaling accross 3430,3440,3450 and 3630 series.
Caveat: does not handle dynamic addition of opp after the
bridgedriver is inserted - this can be done once the framework for
the same is made available
Cc: Ameya Palande <ameya.palande@xxxxxxxxx>
Cc: Deepak Chitriki <deepak.chitriki@xxxxxx>
Cc: Felipe Contreras <felipe.contreras@xxxxxxxxx>
Cc: Hiroshi Doyu <hiroshi.doyu@xxxxxxxxx>
Cc: Omar Ramirez Luna <omar.ramirez@xxxxxx>
Signed-off-by: Nishanth Menon <nm@xxxxxx>
---
caveat: this does not use the ENUM implementation yet, this can be once it is
merged to pm-wip-opp branch.
arch/arm/mach-omap2/dspbridge.c | 99 ++++++++++++++++++++++++++++++++++++++-
1 files changed, 98 insertions(+), 1 deletions(-)
diff --git a/arch/arm/mach-omap2/dspbridge.c b/arch/arm/mach-omap2/dspbridge.c
index 26b860f..935afd7 100644
--- a/arch/arm/mach-omap2/dspbridge.c
+++ b/arch/arm/mach-omap2/dspbridge.c
@@ -15,6 +15,20 @@
#ifdef CONFIG_BRIDGE_DVFS
#include <mach/omap-pm.h>
+#include <plat/opp.h>
+/*
+ * The DSP load balancer works on the following logic:
+ * Opp frequencies:
+ * 0 <---------> Freq 1 <------------> Freq 2 <---------> Freq 3
+ * DSP Thresholds for the frequencies:
+ * 0M<-------X-> Freq 1 <-------M--X-> Freq 2 <----M--X-> Freq 3
+ * Where, M is the minimal threshold and X is maximum threshold
+ *
+ * if from Freq x to Freq y; where x > y, transition happens on M
+ * if from Freq x to Freq y; where x < y, transition happens on X
+ */
+#define BRIDGE_THRESH_HIGH_PERCENT 95
+#define BRIDGE_THRESH_LOW_PERCENT 88
#endif
#include <dspbridge/host_os.h>
@@ -42,7 +56,90 @@ static struct dspbridge_platform_data dspbridge_pdata __initdata = {
static int get_opp_table(struct dspbridge_platform_data *pdata)
{
#ifdef CONFIG_BRIDGE_DVFS
- /* Do nothing now - fill based on PM implementation */
+ int mpu_freqs;
+ int dsp_freqs;
+ int i;
+ struct omap_opp *opp;
+ unsigned long freq, old_rate;
+
+ mpu_freqs = opp_get_opp_count(mpu_opps);
+ dsp_freqs = opp_get_opp_count(dsp_opps);
+ if (mpu_freqs < 0 || dsp_freqs < 0 || mpu_freqs != dsp_freqs) {
+ pr_err("mpu and dsp frequencies are inconsistent! "
+ "mpu_freqs=%d dsp_freqs=%d\n", mpu_freqs, dsp_freqs);
+ return -EINVAL;
+ }
+ /* allocate memory if we have opps initialized */
+ pdata->mpu_speeds = kzalloc(sizeof(u32) * mpu_freqs,
+ GFP_KERNEL);
+ if (!pdata->mpu_speeds) {
+ pr_err("unable to allocate memory for the mpu"
+ "frequencies\n");
+ return -ENOMEM;
+ }
+ opp = mpu_opps;
+ i = 0;
+ freq = 0;
+ while (!IS_ERR(opp = opp_find_freq_ceil(opp, &freq))) {
+ pdata->mpu_speeds[i] = freq;
+ freq++;
+ i++;
+ }
+ pdata->mpu_num_speeds = mpu_freqs;
+ pdata->mpu_min_speed = pdata->mpu_speeds[0];
+ pdata->mpu_max_speed = pdata->mpu_speeds[mpu_freqs - 1];
+ /* need an initial terminator */
+ pdata->dsp_freq_table = kzalloc(
+ sizeof(struct dsp_shm_freq_table) *
+ (dsp_freqs + 1), GFP_KERNEL);
+ if (!pdata->dsp_freq_table) {
+ pr_err("unable to allocate memory for the dsp"
+ "frequencies\n");
+ return -ENOMEM;
+ }
+
+ opp = dsp_opps;
+ i = 1;
+ freq = 0;
+ old_rate = 0;
+ /*
+ * the freq table is in terms of khz.. so we need to
+ * divide by 1000
+ */
+ while (!IS_ERR(opp = opp_find_freq_ceil(opp, &freq))) {
+ /* dsp frequencies are in khz */
+ u32 rate = freq / 1000;
+ /*
+ * On certain 34xx silicons, certain OPPs are duplicated
+ * for DSP - handle those by copying previous opp value
+ */
+ if (rate == old_rate) {
+ memcpy(&pdata->dsp_freq_table[i],
+ &pdata->dsp_freq_table[i-1],
+ sizeof(struct dsp_shm_freq_table));
+ } else {
+ pdata->dsp_freq_table[i].dsp_freq = rate;
+ pdata->dsp_freq_table[i].u_volts =
+ opp_get_voltage(opp);
+ /*
+ * min threshold:
+ * NOTE: index 1 needs a min of 0! else no
+ * scaling happens at DSP!
+ */
+ pdata->dsp_freq_table[i].thresh_min_freq =
+ ((old_rate * BRIDGE_THRESH_LOW_PERCENT) / 100);
+
+ /* max threshold */
+ pdata->dsp_freq_table[i].thresh_max_freq =
+ ((rate * BRIDGE_THRESH_HIGH_PERCENT) / 100);
+ }
+ old_rate = rate;
+ freq++;
+ i++;
+ }
+ /* the last entry should map with maximum rate */
+ pdata->dsp_freq_table[i - 1].thresh_max_freq = old_rate;
+ pdata->dsp_num_speeds = dsp_freqs;
#endif
return 0;
}
--
1.6.3.3
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