diff options
| -rw-r--r-- | arch/powerpc/platforms/powermac/feature.c | 11 | ||||
| -rw-r--r-- | drivers/macintosh/smu.c | 25 | ||||
| -rw-r--r-- | include/asm-powerpc/pmac_feature.h | 8 |
3 files changed, 42 insertions, 2 deletions
diff --git a/arch/powerpc/platforms/powermac/feature.c b/arch/powerpc/platforms/powermac/feature.c index ba931be2175..5169ecc3712 100644 --- a/arch/powerpc/platforms/powermac/feature.c +++ b/arch/powerpc/platforms/powermac/feature.c @@ -2565,6 +2565,8 @@ static void __init probe_uninorth(void) /* Locate core99 Uni-N */ uninorth_node = of_find_node_by_name(NULL, "uni-n"); + uninorth_maj = 1; + /* Locate G5 u3 */ if (uninorth_node == NULL) { uninorth_node = of_find_node_by_name(NULL, "u3"); @@ -2575,8 +2577,10 @@ static void __init probe_uninorth(void) uninorth_node = of_find_node_by_name(NULL, "u4"); uninorth_maj = 4; } - if (uninorth_node == NULL) + if (uninorth_node == NULL) { + uninorth_maj = 0; return; + } addrp = of_get_property(uninorth_node, "reg", NULL); if (addrp == NULL) @@ -3029,3 +3033,8 @@ void pmac_resume_agp_for_card(struct pci_dev *dev) pmac_agp_resume(pmac_agp_bridge); } EXPORT_SYMBOL(pmac_resume_agp_for_card); + +int pmac_get_uninorth_variant(void) +{ + return uninorth_maj; +} diff --git a/drivers/macintosh/smu.c b/drivers/macintosh/smu.c index 8ba49385c3f..77ad192962c 100644 --- a/drivers/macintosh/smu.c +++ b/drivers/macintosh/smu.c @@ -85,6 +85,7 @@ struct smu_device { u32 cmd_buf_abs; /* command buffer absolute */ struct list_head cmd_list; struct smu_cmd *cmd_cur; /* pending command */ + int broken_nap; struct list_head cmd_i2c_list; struct smu_i2c_cmd *cmd_i2c_cur; /* pending i2c command */ struct timer_list i2c_timer; @@ -135,6 +136,19 @@ static void smu_start_cmd(void) fend = faddr + smu->cmd_buf->length + 2; flush_inval_dcache_range(faddr, fend); + + /* We also disable NAP mode for the duration of the command + * on U3 based machines. + * This is slightly racy as it can be written back to 1 by a sysctl + * but that never happens in practice. There seem to be an issue with + * U3 based machines such as the iMac G5 where napping for the + * whole duration of the command prevents the SMU from fetching it + * from memory. This might be related to the strange i2c based + * mechanism the SMU uses to access memory. + */ + if (smu->broken_nap) + powersave_nap = 0; + /* This isn't exactly a DMA mapping here, I suspect * the SMU is actually communicating with us via i2c to the * northbridge or the CPU to access RAM. @@ -211,6 +225,10 @@ static irqreturn_t smu_db_intr(int irq, void *arg) misc = cmd->misc; mb(); cmd->status = rc; + + /* Re-enable NAP mode */ + if (smu->broken_nap) + powersave_nap = 1; bail: /* Start next command if any */ smu_start_cmd(); @@ -461,7 +479,7 @@ int __init smu_init (void) if (np == NULL) return -ENODEV; - printk(KERN_INFO "SMU driver %s %s\n", VERSION, AUTHOR); + printk(KERN_INFO "SMU: Driver %s %s\n", VERSION, AUTHOR); if (smu_cmdbuf_abs == 0) { printk(KERN_ERR "SMU: Command buffer not allocated !\n"); @@ -533,6 +551,11 @@ int __init smu_init (void) goto fail; } + /* U3 has an issue with NAP mode when issuing SMU commands */ + smu->broken_nap = pmac_get_uninorth_variant() < 4; + if (smu->broken_nap) + printk(KERN_INFO "SMU: using NAP mode workaround\n"); + sys_ctrler = SYS_CTRLER_SMU; return 0; diff --git a/include/asm-powerpc/pmac_feature.h b/include/asm-powerpc/pmac_feature.h index 26bcb0aa164..877c35a4356 100644 --- a/include/asm-powerpc/pmac_feature.h +++ b/include/asm-powerpc/pmac_feature.h @@ -392,6 +392,14 @@ extern u32 __iomem *uninorth_base; #define UN_BIS(r,v) (UN_OUT((r), UN_IN(r) | (v))) #define UN_BIC(r,v) (UN_OUT((r), UN_IN(r) & ~(v))) +/* Uninorth variant: + * + * 0 = not uninorth + * 1 = U1.x or U2.x + * 3 = U3 + * 4 = U4 + */ +extern int pmac_get_uninorth_variant(void); #endif /* __ASM_POWERPC_PMAC_FEATURE_H */ #endif /* __KERNEL__ */ |