ARM: Tegra11: Add LPDDR3 iso emc calculator

Add variable iso emc calculator for LPDDR3, which
returns iso emc share percentage based on requested
iso bandwidth.

Bug 1266369
Bug 1259082

Change-Id: Ie97625ca5da11baeb60988ba2c65a6db76ad0209
Signed-off-by: Daniel Solomon <daniels@nvidia.com>
(cherry picked from commit 78bf03551e9d97f1a771a6a88138ad6cc2e9609a)
Reviewed-on: http://git-master/r/252581
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Krishna Reddy <vdumpa@nvidia.com>

diff --git a/arch/arm/mach-tegra/tegra11_emc.c b/arch/arm/mach-tegra/tegra11_emc.c
index b8b68a3b972bc280e9ebfd30fe6e3d718846ea34..61d2a0c59edc850765b1d671312038826c11864d 100644 (file)
--- a/arch/arm/mach-tegra/tegra11_emc.c
+++ b/arch/arm/mach-tegra/tegra11_emc.c
@@ -50,12 +50,49 @@ module_param(emc_enable, bool, 0644);
 
 static int pasr_enable;
 
+static u32 bw_calc_freqs[] = {
+       40, 60, 80, 100, 120, 140, 160, 180, 200, 220, 240, 260, 280, 300
+};
+
+static u32 tegra11_lpddr3_emc_usage_share_default[] = {
+       35, 38, 40,  41,  42,  43,  43,  45,  45,  45,  46,  47,  48,  48, 50
+};
+
+static u32 tegra11_lpddr3_emc_usage_share_dc[] = {
+       47, 52, 55,  57,  58,  59,  60,  62,  62,  63,  64,  66,  67,  68, 70
+};
+
+static u8 iso_share_calc_t114_lpddr3_default(unsigned long iso_bw);
+static u8 iso_share_calc_t114_lpddr3_dc(unsigned long iso_bw);
+
 u8 tegra_emc_bw_efficiency = 80;
-static struct emc_iso_usage tegra11_emc_iso_usage[] = {
-       { BIT(EMC_USER_DC),                     80 },
-       { BIT(EMC_USER_DC) | BIT(EMC_USER_VI),  45 },
+
+static struct emc_iso_usage tegra11_ddr3_emc_iso_usage[] = {
+       { BIT(EMC_USER_DC),                     80},
+       { BIT(EMC_USER_DC) | BIT(EMC_USER_VI),  45},
 };
 
+static struct emc_iso_usage tegra11_lpddr3_emc_iso_usage[] = {
+       {
+               BIT(EMC_USER_DC),
+               80, iso_share_calc_t114_lpddr3_dc
+       },
+       {
+               BIT(EMC_USER_DC) | BIT(EMC_USER_VI),
+               45, iso_share_calc_t114_lpddr3_default
+       },
+       {
+               BIT(EMC_USER_DC) | BIT(EMC_USER_MSENC),
+               50, iso_share_calc_t114_lpddr3_default
+       },
+       {
+               BIT(EMC_USER_DC) | BIT(EMC_USER_3D),
+               50, iso_share_calc_t114_lpddr3_default
+       },
+};
+
+#define MHZ 1000000
+#define TEGRA_EMC_ISO_USE_FREQ_MAX_NUM 14
 #define PLL_C_DIRECT_FLOOR             333500000
 #define EMC_STATUS_UPDATE_TIMEOUT      100
 #define TEGRA_EMC_TABLE_MAX_SIZE       16
@@ -1571,8 +1608,14 @@ int __init tegra11_emc_init(void)
 {
        int ret = platform_driver_register(&tegra11_emc_driver);
        if (!ret) {
-               tegra_emc_iso_usage_table_init(tegra11_emc_iso_usage,
-                       ARRAY_SIZE(tegra11_emc_iso_usage));
+               if (dram_type == DRAM_TYPE_LPDDR2)
+                       tegra_emc_iso_usage_table_init(
+                               tegra11_lpddr3_emc_iso_usage,
+                               ARRAY_SIZE(tegra11_lpddr3_emc_iso_usage));
+               else if (dram_type == DRAM_TYPE_DDR3)
+                       tegra_emc_iso_usage_table_init(
+                               tegra11_ddr3_emc_iso_usage,
+                               ARRAY_SIZE(tegra11_ddr3_emc_iso_usage));
                if (emc_enable) {
                        unsigned long rate = tegra_emc_round_rate_updown(
                                emc->boot_rate, false);
@@ -1669,6 +1712,38 @@ int tegra_emc_set_over_temp_state(unsigned long state)
        return 0;
 }
 
+static inline int bw_calc_get_freq_idx(unsigned long bw)
+{
+       int idx = 0;
+
+       if (bw > bw_calc_freqs[TEGRA_EMC_ISO_USE_FREQ_MAX_NUM-1] * MHZ)
+               idx = TEGRA_EMC_ISO_USE_FREQ_MAX_NUM;
+
+       for (; idx < TEGRA_EMC_ISO_USE_FREQ_MAX_NUM; idx++) {
+               u32 freq = bw_calc_freqs[idx] * MHZ;
+               if (bw < freq) {
+                       if (idx)
+                               idx--;
+                       break;
+               } else if (bw == freq)
+                       break;
+       }
+
+       return idx;
+}
+
+static u8 iso_share_calc_t114_lpddr3_default(unsigned long iso_bw)
+{
+       int freq_idx = bw_calc_get_freq_idx(iso_bw);
+       return tegra11_lpddr3_emc_usage_share_default[freq_idx];
+}
+
+static u8 iso_share_calc_t114_lpddr3_dc(unsigned long iso_bw)
+{
+       int freq_idx = bw_calc_get_freq_idx(iso_bw);
+       return tegra11_lpddr3_emc_usage_share_dc[freq_idx];
+}
+
 #ifdef CONFIG_DEBUG_FS
 
 static struct dentry *emc_debugfs_root;