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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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After dmaengine_terminate_all() has been invoked then both DMA drivers (edma and omap-dma) do not invoke dma_cookie_complete() to mark the transfer as complete. This dma_cookie_complete() is performed by the Synopsys DesignWare driver which is probably the only one that is used by omap8250-dma and hence don't see following problem… …which is that once a RX transfer has been terminated then following query of channel status reports DMA_IN_PROGRESS (again: the actual transfer has been canceled, there is nothing going on anymore). This means that serial8250_rx_dma() never enqueues another DMA transfer because it (wrongly) assumes that there is a transer already pending. Vinod Koul refuses to accept a patch which adds this dma_cookie_complete() to both drivers and so dmaengine_tx_status() would report DMA_COMPLETE instead (and behave like the Synopsys DesignWare driver already does). He argues that I am not allowed to use the cookie to query the status and that the driver already cleaned everything up after the invokation of dmaengine_terminate_all(). To end this I add a bookkeeping whether or not a RX-transfer has been started to the 8250-dma code. It has already been done for the TX side. *Now* we learn about the RX status based on our bookkeeping and don't need dmaengine_tx_status() for this anymore. Cc: vinod.koul@intel.com Reviewed-by: Tony Lindgren <tony@atomide.com> Tested-by: Tony Lindgren <tony@atomide.com> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Reviewed-by: Peter Hurley <peter@hurleysoftware.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
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| .. | ||
| 8250_accent.c | ||
| 8250_acorn.c | ||
| 8250_boca.c | ||
| 8250_core.c | ||
| 8250_dma.c | ||
| 8250_dw.c | ||
| 8250_early.c | ||
| 8250_em.c | ||
| 8250_exar_st16c554.c | ||
| 8250_fintek.c | ||
| 8250_fourport.c | ||
| 8250_fsl.c | ||
| 8250_gsc.c | ||
| 8250_hp300.c | ||
| 8250_hub6.c | ||
| 8250_mtk.c | ||
| 8250_omap.c | ||
| 8250_pci.c | ||
| 8250_pnp.c | ||
| 8250.h | ||
| Kconfig | ||
| Makefile | ||
| serial_cs.c | ||