Re: [PATCH 0/2] OMAP2+: DMA: fix src/dst position reporting
On 10/31/2011 04:20 PM, Peter Ujfalusi wrote: Hello, If the user asks for the sDMA current position before the first data has been transmitted (before the first DMA request has been generated), the reported position is not valid: src position: CSAC is uninitialized dst position: CDAC is 0 The return values in both case considered invalid. This sitation can be identified by checking if the CDAC register is 0 (it is initialized to 0 in omap_dam_start call). In this case return the programmed source/destination address. The affected omap_get_dma_src_pos/omap_get_dma_dst_pos functions are used by the audio stack mainly for checking the current position of the audio stream. Regards, Peter --- Peter Ujfalusi (2): OMAP2+: DMA: Workaround for invalid source position OMAP2+: DMA: Workaround for invalid destination position arch/arm/plat-omap/dma.c | 25 ++--- 1 files changed, 22 insertions(+), 3 deletions(-) Both, Reviewed-by: Jarkko Nikula jarkko.nik...@bitmer.com -- To unsubscribe from this list: send the line unsubscribe linux-omap in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
[PATCH 0/2] OMAP2+: DMA: fix src/dst position reporting
Hello, If the user asks for the sDMA current position before the first data has been transmitted (before the first DMA request has been generated), the reported position is not valid: src position: CSAC is uninitialized dst position: CDAC is 0 The return values in both case considered invalid. This sitation can be identified by checking if the CDAC register is 0 (it is initialized to 0 in omap_dam_start call). In this case return the programmed source/destination address. The affected omap_get_dma_src_pos/omap_get_dma_dst_pos functions are used by the audio stack mainly for checking the current position of the audio stream. Regards, Peter --- Peter Ujfalusi (2): OMAP2+: DMA: Workaround for invalid source position OMAP2+: DMA: Workaround for invalid destination position arch/arm/plat-omap/dma.c | 25 ++--- 1 files changed, 22 insertions(+), 3 deletions(-) -- 1.7.7.1 -- To unsubscribe from this list: send the line unsubscribe linux-omap in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
