Am Montag, den 29.12.2014, 10:49 +0800 schrieb Vince Hsu: [...] > >> That's a read fence to assure the post of the previous writes through > >> Tegra interconnect. (copy-paster from > >> https://android.googlesource.com/kernel/tegra.git/+/28b107dcb3aa122de8e94e48af548140d519298f) > > I see what it does, the question is more about why this is needed. > > What is the Tegra interconnect? According to the TRM the Tegra contains > > some standard AXI <-> AHB <-> APB bridges. That a read is needed to > > assure the write is posted to the APB bus seems to imply that there is > > some write buffering in one of those bridges. Can we get this documented > > somewhere? > The TRM does mention a read after the write. Check the section 32.2.2.3. > Unfortunately this doesn't seem to be included in the public TRM. It would be nice if this could be documented either in the next version of the TRM or as a public Appnote. Thanks, Lucas -- To unsubscribe from this list: send the line "unsubscribe linux-tegra" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
