Re: [U-Boot] AM/DM37X How to configure registers to get 1000MHz
> -Original Message- > From: Enric Balletbò i Serra [mailto:eballe...@gmail.com] > Sent: Friday, November 19, 2010 6:43 PM > To: Premi, Sanjeev > Cc: u-boot@lists.denx.de; Steve Sakoman > Subject: Re: [U-Boot] AM/DM37X How to configure registers to > get 1000MHz [snip]...[snip] > >> > >> I'm thinking in two scenarios : > >> > >> 1. For OMAP35X there are devices that support 600MHz as > max frequency > >> but others supports 720MHz, I want to set by default 600MHz and if > >> device supports 720MHz change to this frequency. > > > > [sp] You can look at one of my patches on linux kernel to > identify the > > device capability for 600/720MHz. > > I''ll do, thanks > > > > >> 2. For AM/DM37X, maybe I'm wrong, but the default frequency for > >> AM/DM37X is set to 600MHz, Like OMAP35X i want to set default to > >> 800MHz and i device supports change to 1000MHz. > > > > [sp] The device comes up at 600MHz for now, but there is no > limitation > > on device to go all the way to 1GHz. > > > >> > >> Which is the better way to do this ? > > > > [sp] So, you are looking for common mechanism to go to > highest supported > > frequency. Right? > > Yes, I think should be interesting for all OMAP35/AM/DM37 a > mechanism like this. [sp] I am stuck is a critical activity for next few days; would be able to work on this only next week. However, if you could start on it, I have quick thought process here: 1) Have a function that returns max supported freq for each device. - Function for OMAP35x can internally check the capability bit - While the one for AM37x would return 1GHz. 2) There is a mapping table for freq. and corresponding M, N, M2 values that can be used to pick select the right values. 3) Such a table exists in ASM; I have an intent to make it more readable in C - but always goes low in priority. 4) Another twist to 2) above can be use of env variable that gets pref. e.g. 37x support 1GHz; but you wantto still boot at 800MHz for some reason; then setting env var would make the function return 800 instead of 1000. ~sanjeev > > > > >> > >> Thanks in advance, > >> Enric > >> > >> > > >> > ~sanjeev > >> > > >> >> > >> >> Thanks in advance, > >> >> Enric > >> >> ___ > >> >> U-Boot mailing list > >> >> U-Boot@lists.denx.de > >> >> http://lists.denx.de/mailman/listinfo/u-boot > >> >> > >> > ___ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
Re: [U-Boot] AM/DM37X How to configure registers to get 1000MHz
Hi, 2010/11/19 Premi, Sanjeev : >> -Original Message- >> From: Enric Balletbò i Serra [mailto:eballe...@gmail.com] >> Sent: Friday, November 19, 2010 6:30 PM >> To: Premi, Sanjeev >> Cc: u-boot@lists.denx.de; Steve Sakoman >> Subject: Re: [U-Boot] AM/DM37X How to configure registers to >> get 1000MHz >> >> Hi, >> >> Thanks for your reply >> >> 2010/11/19 Premi, Sanjeev : >> >> -Original Message- >> >> From: u-boot-boun...@lists.denx.de >> >> [mailto:u-boot-boun...@lists.denx.de] On Behalf Of Enric >> >> Balletbò i Serra >> >> Sent: Friday, November 19, 2010 2:42 PM >> >> To: u-boot@lists.denx.de; Steve Sakoman >> >> Subject: [U-Boot] AM/DM37X How to configure registers to >> get 1000MHz >> >> >> >> Hi all, >> >> >> >> I would ask a question, maybe someone can help, which is the better >> >> way to configure the PRCM registers to get 1000MHz on AM/DM37X >> >> processor ? >> > >> > You need set the multipliers and dividers apprioriately - >> based on the >> > sysclk. >> > >> > Would help to understand the context of "better"? >> >> I'm thinking in two scenarios : >> >> 1. For OMAP35X there are devices that support 600MHz as max frequency >> but others supports 720MHz, I want to set by default 600MHz and if >> device supports 720MHz change to this frequency. > > [sp] You can look at one of my patches on linux kernel to identify the > device capability for 600/720MHz. I''ll do, thanks > >> 2. For AM/DM37X, maybe I'm wrong, but the default frequency for >> AM/DM37X is set to 600MHz, Like OMAP35X i want to set default to >> 800MHz and i device supports change to 1000MHz. > > [sp] The device comes up at 600MHz for now, but there is no limitation > on device to go all the way to 1GHz. > >> >> Which is the better way to do this ? > > [sp] So, you are looking for common mechanism to go to highest supported > frequency. Right? Yes, I think should be interesting for all OMAP35/AM/DM37 a mechanism like this. > >> >> Thanks in advance, >> Enric >> >> > >> > ~sanjeev >> > >> >> >> >> Thanks in advance, >> >> Enric >> >> ___ >> >> U-Boot mailing list >> >> U-Boot@lists.denx.de >> >> http://lists.denx.de/mailman/listinfo/u-boot >> >> >> ___ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
Re: [U-Boot] AM/DM37X How to configure registers to get 1000MHz
> -Original Message- > From: Enric Balletbò i Serra [mailto:eballe...@gmail.com] > Sent: Friday, November 19, 2010 6:30 PM > To: Premi, Sanjeev > Cc: u-boot@lists.denx.de; Steve Sakoman > Subject: Re: [U-Boot] AM/DM37X How to configure registers to > get 1000MHz > > Hi, > > Thanks for your reply > > 2010/11/19 Premi, Sanjeev : > >> -Original Message- > >> From: u-boot-boun...@lists.denx.de > >> [mailto:u-boot-boun...@lists.denx.de] On Behalf Of Enric > >> Balletbò i Serra > >> Sent: Friday, November 19, 2010 2:42 PM > >> To: u-boot@lists.denx.de; Steve Sakoman > >> Subject: [U-Boot] AM/DM37X How to configure registers to > get 1000MHz > >> > >> Hi all, > >> > >> I would ask a question, maybe someone can help, which is the better > >> way to configure the PRCM registers to get 1000MHz on AM/DM37X > >> processor ? > > > > You need set the multipliers and dividers apprioriately - > based on the > > sysclk. > > > > Would help to understand the context of "better"? > > I'm thinking in two scenarios : > > 1. For OMAP35X there are devices that support 600MHz as max frequency > but others supports 720MHz, I want to set by default 600MHz and if > device supports 720MHz change to this frequency. [sp] You can look at one of my patches on linux kernel to identify the device capability for 600/720MHz. > 2. For AM/DM37X, maybe I'm wrong, but the default frequency for > AM/DM37X is set to 600MHz, Like OMAP35X i want to set default to > 800MHz and i device supports change to 1000MHz. [sp] The device comes up at 600MHz for now, but there is no limitation on device to go all the way to 1GHz. > > Which is the better way to do this ? [sp] So, you are looking for common mechanism to go to highest supported frequency. Right? > > Thanks in advance, >Enric > > > > > ~sanjeev > > > >> > >> Thanks in advance, > >> Enric > >> ___ > >> U-Boot mailing list > >> U-Boot@lists.denx.de > >> http://lists.denx.de/mailman/listinfo/u-boot > >> > ___ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
Re: [U-Boot] AM/DM37X How to configure registers to get 1000MHz
Hi, Thanks for your reply 2010/11/19 Premi, Sanjeev : >> -Original Message- >> From: u-boot-boun...@lists.denx.de >> [mailto:u-boot-boun...@lists.denx.de] On Behalf Of Enric >> Balletbò i Serra >> Sent: Friday, November 19, 2010 2:42 PM >> To: u-boot@lists.denx.de; Steve Sakoman >> Subject: [U-Boot] AM/DM37X How to configure registers to get 1000MHz >> >> Hi all, >> >> I would ask a question, maybe someone can help, which is the better >> way to configure the PRCM registers to get 1000MHz on AM/DM37X >> processor ? > > You need set the multipliers and dividers apprioriately - based on the > sysclk. > > Would help to understand the context of "better"? I'm thinking in two scenarios : 1. For OMAP35X there are devices that support 600MHz as max frequency but others supports 720MHz, I want to set by default 600MHz and if device supports 720MHz change to this frequency. 2. For AM/DM37X, maybe I'm wrong, but the default frequency for AM/DM37X is set to 600MHz, Like OMAP35X i want to set default to 800MHz and i device supports change to 1000MHz. Which is the better way to do this ? Thanks in advance, Enric > > ~sanjeev > >> >> Thanks in advance, >> Enric >> ___ >> U-Boot mailing list >> U-Boot@lists.denx.de >> http://lists.denx.de/mailman/listinfo/u-boot >> ___ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
Re: [U-Boot] AM/DM37X How to configure registers to get 1000MHz
> -Original Message- > From: u-boot-boun...@lists.denx.de > [mailto:u-boot-boun...@lists.denx.de] On Behalf Of Enric > Balletbò i Serra > Sent: Friday, November 19, 2010 2:42 PM > To: u-boot@lists.denx.de; Steve Sakoman > Subject: [U-Boot] AM/DM37X How to configure registers to get 1000MHz > > Hi all, > > I would ask a question, maybe someone can help, which is the better > way to configure the PRCM registers to get 1000MHz on AM/DM37X > processor ? You need set the multipliers and dividers apprioriately - based on the sysclk. Would help to understand the context of "better"? ~sanjeev > > Thanks in advance, >Enric > ___ > U-Boot mailing list > U-Boot@lists.denx.de > http://lists.denx.de/mailman/listinfo/u-boot > ___ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
[U-Boot] AM/DM37X How to configure registers to get 1000MHz
Hi all, I would ask a question, maybe someone can help, which is the better way to configure the PRCM registers to get 1000MHz on AM/DM37X processor ? Thanks in advance, Enric ___ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
