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47b7de2f6c
It was found that in IDMAC mode after soft-reset driver switches to PIO mode. That's what happens in case of DTO timeout overflow calculation failure: 1. soft-reset is called 2. driver restarts dma 3. descriptors states are checked, one of descriptor is owned by the IDMAC. 4. driver can't use DMA and then switches to PIO mode. Failure was already fixed in: https://www.spinics.net/lists/linux-mmc/msg48125.html. Behaviour while soft-reset is not something we except or even want to happen. So we switch from dw_mci_idmac_reset to dw_mci_idmac_init, so descriptors are cleaned before starting dma. And while at it explicitly zero des0 which otherwise might contain garbage as being allocated by dmam_alloc_coherent(). Signed-off-by: Evgeniy Didin <Evgeniy.Didin@synopsys.com> Cc: Jaehoon Chung <jh80.chung@samsung.com> Cc: Ulf Hansson <ulf.hansson@linaro.org> Cc: Andy Shevchenko <andy.shevchenko@gmail.com> Cc: Jisheng Zhang <Jisheng.Zhang@synaptics.com> Cc: Shawn Lin <shawn.lin@rock-chips.com> Cc: Alexey Brodkin <abrodkin@synopsys.com> Cc: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com> Cc: linux-snps-arc@lists.infradead.org Cc: <stable@vger.kernel.org> # 4.4+ Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> |
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