Recently I've been reading the PASR patch, and I am really interested in
that. Cause I am a total freshman to linux kernel, there are a few
questions about the framework. I would very appreciate it if anyone
could take a look at them and give me some suggestions.
Now I am trying to put several memory banks into no_refresh state on a
real device, Nexus 9. Nexus 9 is based on Nvidia Tegra K1, with LPDDR3
as the RAM. Its kernel version is tegra-flounder-3.10. From this kernel
version, tegra 12 seems to support PASR. But tegra K1(tegra 132) does
not have a supporting function like that.
static void tegra12_pasr_apply_mask(u16 *mem_reg, void *cookie)
{
u32 val = 0;
int device = (int)cookie;
val = TEGRA_EMC_MODE_REG_17 | *mem_reg;
val |= device << TEGRA_EMC_MRW_DEV_SHIFT;
emc_writel(val, EMC_MRW);
pr_debug("%s: cookie = %d mem_reg = 0x%04x val = 0x%08x\n",
__func__,
(int)cookie, *mem_reg, val);
}
1. Does tegra 12 really supports PASR?
2. Why doesn't tegra 132 have a PASR driver? Is it because of some
hardware differences? Is it possible if I rewrite a similar driver on
tegra 132, just like tegra 12?
Thanks very much!
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@xxxxxxxxx. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>