Author: mjones Date: Mon Feb 28 04:32:23 2011 New Revision: 6406 URL: https://tracker.coreboot.org/trac/coreboot/changeset/6406
Log: Improving BKDG implementation of P-states, CPU and northbridge frequency and voltage handling for Fam 10 in SVI mode.
Well, I understand it better like this, but maybe it's only me, part of the changes are paranoic, and the only effective change is for a factor depending on mobile or not that I can't test.
Signed-off-by: Xavi Drudis Ferran xdrudis@tinet.cat Acked-by: Marc Jones marcj303@gmail.com
Modified: trunk/src/cpu/amd/model_10xxx/fidvid.c trunk/src/northbridge/amd/amdht/AsPsDefs.h
Modified: trunk/src/cpu/amd/model_10xxx/fidvid.c ============================================================================== --- trunk/src/cpu/amd/model_10xxx/fidvid.c Mon Feb 28 04:25:07 2011 (r6405) +++ trunk/src/cpu/amd/model_10xxx/fidvid.c Mon Feb 28 04:32:23 2011 (r6406) @@ -155,6 +155,18 @@ } }
+static int vidTo100uV(u8 vid) +{// returns voltage corresponding to vid in tenths of mV, i.e. hundreds of uV + // BKDG #31116 rev 3.48 2.4.1.6 + int voltage; + if (vid >= 0x7c) { + voltage = 0; + } else { + voltage = (15500 - (125*vid)); + } + return voltage; +} + static void setVSRamp(device_t dev) { /* BKDG r31116 2010-04-22 2.4.1.7 step b F3xD8[VSRampTime] * If this field accepts 8 values between 10 and 500 us why @@ -181,12 +193,14 @@
/* This function calculates the VsSlamTime using the range of possible * voltages instead of a hardcoded 200us. - * Note:This function is called from setFidVidRegs and setUserPs after - * programming a custom Pstate. + * Note: his function is called only from prep_fid_change, + * and that from init_cpus.c finalize_node_setup() + * (after set AMD MSRs and init ht ) */
+ /* BKDG r31116 2010-04-22 2.4.1.7 step b F3xD8[VSSlamTime] */ /* Calculate Slam Time - * Vslam = 0.4us/mV * Vp0 - (lowest out of Vpmin or Valt) + * Vslam = (mobileCPU?0.2:0.4)us/mV * (Vp0 - (lowest out of Vpmin or Valt)) mV * In our case, we will scale the values by 100 to avoid * decimals. */ @@ -200,8 +214,17 @@ pviModeFlag = 0;
/* Get P0's voltage */ + /* MSRC001_00[68:64] are not programmed yet when called from + prep_fid_change, one might use F4x1[F0:E0] instead, but + theoretically MSRC001_00[68:64] are equal to them after + reset. */ msr = rdmsr(0xC0010064); highVoltageVid = (u8) ((msr.lo >> PS_CPU_VID_SHFT) & 0x7F); + if (!(msr.hi & 0x80000000)) { + printk(BIOS_ERR,"P-state info in MSRC001_0064 is invalid !!!\n"); + highVoltageVid = (u8) ((pci_read_config32(dev, 0x1E0) + >> PS_CPU_VID_SHFT) & 0x7F); + }
/* If SVI, we only care about CPU VID. * If PVI, determine the higher voltage b/t NB and CPU @@ -212,17 +235,23 @@ highVoltageVid = bValue; }
- /* Get Pmin's index */ + /* Get PSmax's index */ msr = rdmsr(0xC0010061); - bValue = (u8) ((msr.lo >> PS_CUR_LIM_SHFT) & BIT_MASK_3); - - /* Get Pmin's VID */ + bValue = (u8) ((msr.lo >> PS_MAX_VAL_SHFT) & BIT_MASK_3); + + /* Get PSmax's VID */ msr = rdmsr(0xC0010064 + bValue); lowVoltageVid = (u8) ((msr.lo >> PS_CPU_VID_SHFT) & 0x7F); + if (!(msr.hi & 0x80000000)) { + printk(BIOS_ERR,"P-state info in MSR%8x is invalid !!!\n",0xC0010064 + bValue); + lowVoltageVid = (u8) ((pci_read_config32(dev, 0x1E0+(bValue*4)) + >> PS_CPU_VID_SHFT) & 0x7F); + }
/* If SVI, we only care about CPU VID. * If PVI, determine the higher voltage b/t NB and CPU - */ + * BKDG 2.4.1.7 (a) + */ if (pviModeFlag) { bValue = (u8) ((msr.lo >> PS_NB_VID_SHFT) & 0x7F); if (lowVoltageVid > bValue) @@ -237,20 +266,9 @@ if (lowVoltageVid < bValue) lowVoltageVid = bValue;
- /* If Vids are 7Dh - 7Fh, force 7Ch to keep calculations linear */ - if (lowVoltageVid > 0x7C) { - lowVoltageVid = 0x7C; - if (highVoltageVid > 0x7C) - highVoltageVid = 0x7C; - } - - bValue = (u8) (lowVoltageVid - highVoltageVid); + u8 mobileFlag = get_platform_type() & AMD_PTYPE_MOB; + minimumSlamTime = (mobileFlag?2:4) * (vidTo100uV(highVoltageVid) - vidTo100uV(lowVoltageVid)); /* * 0.01 us */
- /* Each Vid increment is 12.5 mV. The minimum slam time is: - * vidCodeDelta * 12.5mV * 0.4us/mV - * Scale by 100 to avoid decimals. - */ - minimumSlamTime = bValue * (125 * 4);
/* Now round up to nearest register setting. * Note that if we don't find a value, we
Modified: trunk/src/northbridge/amd/amdht/AsPsDefs.h ============================================================================== --- trunk/src/northbridge/amd/amdht/AsPsDefs.h Mon Feb 28 04:25:07 2011 (r6405) +++ trunk/src/northbridge/amd/amdht/AsPsDefs.h Mon Feb 28 04:32:23 2011 (r6406) @@ -25,7 +25,7 @@ #define APIC_BAR_BP 0x100 /* APIC_BAR BSP bit */
#define PS_LIM_REG 0xC0010061 /* P-state Current Limit Register */ -#define PS_CUR_LIM_SHFT 4 /* P-state Current Limit shift position */ +#define PS_MAX_VAL_SHFT 4 /* P-state Maximum Value shift position */
#define PS_CTL_REG 0xC0010062 /* P-state Control Register */ #define PS_CMD_MASK_OFF 0xfffffff8 /* P-state Control Register CMD Mask OFF */