Hi Felipe, On Friday 20 May 2016 12:06 AM, Felipe Balbi wrote: > > Hi, > > Tony Lindgren <tony@xxxxxxxxxxx> writes: >> * Peter Ujfalusi <peter.ujfalusi@xxxxxx> [160519 01:10]: >>> On 05/18/2016 10:30 PM, Tony Lindgren wrote: >>>> Ideally the adma support would be a separate loadable module, >>>> similar how the cppi41dma is a child of the OTG controller. >>> >>> The Master DMA is part of the hsmmc IP block. If the same ADMA module is >>> present on other IPs it might be beneficial to have a helper library to handle >>> it (allocating the descriptor pool, wrinting, updating descriptors, etc). >> >> OK. Yeah if it's part of the MMC controller it makes no sense to >> separate it. So then the conecrns are using alternate DMA >> implementations and keeping PM runtime working :) >> >> BTW, Felipe mentioned that the best thing to do in the long run would >> be to set up sdhci-omap.c operating in ADMA mode. >> >> Felipe, care to summarize what you had in mind? > > yeah, just write a new sdhci-omap.c to start moving away from > omap-hsmmc.c, just like it was done for 8250-omap. > > At the beginning, it could be just the bare minimum to get it working > and slowly move over stuff like pm runtime, dmaengine, PIO. Move more > platforms over to that driver and, eventually, get rid of omap-hsmmc.c > altogether. > > That way, development can be focussed on generic layers (SDHCI) to which > OMAP MMC controller is compliant (apart from the VERSION register > quirk). About an year back, when I tried using SDHCI for OMAP I ran into issues and was not able to get it working. IIRC SDHCI_PRESENT_STATE (or OMAP_HSMMC_PSTATE) was not showing the correct state for card present and is unable to raise an interrupt when a card is inserted. I didn't debug this further. It also kept me wondering why gpio interrupt was always used for card detect instead of using mmci_sdcd line of the controller. Thanks Kishon -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
