Re: [alsa-devel] [PATCH v2] [ALSA] Add ASoC drivers for the Freescale MPC8610 SoC
Olof Johansson wrote: > Having been in a similar situation myself (needing to share resources > between DMA, ethernet and function offload), I recommend creating a > separate small library that all those drivers use, instead of making > some sort of dependency between drivers in completely different parts > of the kernel. Well, the DMA driver should be in soon. Actually, it should be in now, because I saw a blurb in this month's Linux Journal about it. As soon as I find it :-), I'll post a new patch that adds arbitration. -- Timur Tabi Linux kernel developer at Freescale ___ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
Re: [alsa-devel] [PATCH v2] [ALSA] Add ASoC drivers for the Freescale MPC8610 SoC
On Thu, Jan 10, 2008 at 05:12:16PM -0600, Timur Tabi wrote: > Grant Likely wrote: > > > Does the driver access the DMA and GUTS registers directly? If so, > > what do you have to protect against race conditions of other drivers > > accessing them also. > > I don't have any more protection than any other driver that accesses SOC > registers directly. Last I heard, Zhang's DMA driver was in limbo, and that > driver would be the best place to arbitrate DMA register access. I was > planning > on adding arbitration support to that driver after both drivers were applied. Having been in a similar situation myself (needing to share resources between DMA, ethernet and function offload), I recommend creating a separate small library that all those drivers use, instead of making some sort of dependency between drivers in completely different parts of the kernel. -Olof ___ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
Re: [alsa-devel] [PATCH v2] [ALSA] Add ASoC drivers for the Freescale MPC8610 SoC
Grant Likely wrote: >> As for the GUTS driver, well, I just program a few registers at startup, and >> I >> don't think any other driver touches them. > > Okay; at some point in the future they'll need to be accessed from a > common routine too. I'll add that to my to-do list. -- Timur Tabi Linux kernel developer at Freescale ___ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
Re: [alsa-devel] [PATCH v2] [ALSA] Add ASoC drivers for the Freescale MPC8610 SoC
On 1/10/08, Timur Tabi <[EMAIL PROTECTED]> wrote: > Grant Likely wrote: > > > Does the driver access the DMA and GUTS registers directly? If so, > > what do you have to protect against race conditions of other drivers > > accessing them also. > > I don't have any more protection than any other driver that accesses SOC > registers directly. Last I heard, Zhang's DMA driver was in limbo, and that > driver would be the best place to arbitrate DMA register access. I was > planning > on adding arbitration support to that driver after both drivers were applied. That sounds appropriate > > As for the GUTS driver, well, I just program a few registers at startup, and I > don't think any other driver touches them. Okay; at some point in the future they'll need to be accessed from a common routine too. g. -- Grant Likely, B.Sc., P.Eng. Secret Lab Technologies Ltd. ___ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
Re: [alsa-devel] [PATCH v2] [ALSA] Add ASoC drivers for the Freescale MPC8610 SoC
Grant Likely wrote: > Does the driver access the DMA and GUTS registers directly? If so, > what do you have to protect against race conditions of other drivers > accessing them also. I don't have any more protection than any other driver that accesses SOC registers directly. Last I heard, Zhang's DMA driver was in limbo, and that driver would be the best place to arbitrate DMA register access. I was planning on adding arbitration support to that driver after both drivers were applied. As for the GUTS driver, well, I just program a few registers at startup, and I don't think any other driver touches them. -- Timur Tabi Linux kernel developer at Freescale ___ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
