On Mon, Apr 22, 2013 at 01:43:29AM +0200, Rafael J. Wysocki wrote: > On Friday, April 19, 2013 07:00:57 PM Zhao Chenhui wrote: > > ----- Forwarded message from Zhao Chenhui <chenhui.z...@freescale.com> ----- > > > > Date: Fri, 19 Apr 2013 18:47:39 +0800 > > From: Zhao Chenhui <chenhui.z...@freescale.com> > > To: linuxppc-dev@lists.ozlabs.org > > CC: linux-ker...@vger.kernel.org > > Subject: [linuxppc-release] [PATCH v2 06/15] powerpc/85xx: add support to > > JOG feature using cpufreq interface > > X-Mailer: git-send-email 1.7.3 > > > > From: chenhui zhao <chenhui.z...@freescale.com> > > > > Some 85xx silicons like MPC8536 and P1022 have a JOG feature, which provides > > a dynamic mechanism to lower or raise the CPU core clock at runtime. > > > > This patch adds the support to change CPU frequency using the standard > > cpufreq interface. The ratio CORE to CCB can be 1:1(except MPC8536), 3:2, > > 2:1, 5:2, 3:1, 7:2 and 4:1. > > > > Two CPU cores on P1022 must not in the low power state during the frequency > > transition. The driver uses a atomic counter to meet the requirement. > > > > The jog mode frequency transition process on the MPC8536 is similar to > > the deep sleep process. The driver need save the CPU state and restore > > it after CPU warm reset. > > > > Note: > > * The I/O peripherals such as PCIe and eTSEC may lose packets during > > the jog mode frequency transition. > > * The driver doesn't support MPC8536 Rev 1.0 due to a JOG erratum. > > Subsequent revisions of MPC8536 have corrected the erratum. > > > > Signed-off-by: Dave Liu <dave...@freescale.com> > > Signed-off-by: Li Yang <le...@freescale.com> > > Signed-off-by: Jerry Huang <chang-ming.hu...@freescale.com> > > Signed-off-by: Zhao Chenhui <chenhui.z...@freescale.com> > > CC: Scott Wood <scottw...@freescale.com> > > Well, I'd like someone from the PowerPC camp to comment on this before I take > it. > > Thanks, > Rafael >
OK. Thanks. -Chenhui _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
