The new version of the HW supports MSI interrupts instead of wired interrupts. The MSI interrupts are especially useful for the guest machine execution. The wired interrupts usually trap to the hypervisor and then are relayed to the actual interrupt. The MSI interrupts can be directly fed into the interrupt controller. Adding a new OF compat string (qcom,hidma-1.1) and ACPI string (QCOM8062) to distinguish newer HW from the older ones. v6: * rebase 4.9 kernel v5: http://www.spinics.net/lists/arm-kernel/msg537014.html * dmaengine: qcom_hidma: add MSI support for interrupts ** Return MSI interrupts before calling platform_msi_domain_free_irqs. Also cleanup MSI interrupts on the error path. ** Free the legacy IRQ only if MSI is disabled * add dmaengine: qcom_hidma: break completion processing on error in order to break the completions if an error is observed while servicing completed work. * drop dmaengine: qcom_hidma: make error and success path common as the success path assumes that we'll get the number of notifications for the jobs queued. This is not true under error conditions. * simplify dmaengine: qcom_hidma: protect common data structures. We just need to protect the TRE processed offset. It is the variable that keeps track of outstanding requests. v4: http://www.spinics.net/lists/devicetree/msg144563.html * device tree binding update to refer to msi.txt v3: * day 0 fix for when ACPI is not compiled in * https://www.spinics.net/lists/arm-kernel/msg532179.html v2: https://patchwork.kernel.org/patch/9326399/ * Documentation update for DT bindings * Rebased to slave-next * Dropped dmaengine: qcom_hidma: eliminate processed variables. Replaced it with dmaengine: qcom_hidma: protect common data structures v1: http://lists.infradead.org/pipermail/linux-arm-kernel/2016-July/444167.html * initial implementation Sinan Kaya (10): Documentation: DT: qcom_hidma: update binding for MSI Documentation: DT: qcom_hidma: correct spelling mistakes of: irq: make of_msi_configure accessible from modules dmaengine: qcom_hidma: configure DMA and MSI for OF dmaengine: qcom_hidma: make pending_tre_count atomic dmaengine: qcom_hidma: bring out interrupt cause dmaengine: qcom_hidma: add a common API to setup the interrupt dmaengine: qcom_hidma: protect common data structures dmaengine: qcom_hidma: break completion processing on error dmaengine: qcom_hidma: add MSI support for interrupts .../devicetree/bindings/dma/qcom_hidma_mgmt.txt | 12 +- drivers/dma/qcom/hidma.c | 143 +++++++++++++++++- drivers/dma/qcom/hidma.h | 6 +- drivers/dma/qcom/hidma_dbg.c | 3 +- drivers/dma/qcom/hidma_ll.c | 161 +++++++++++---------- drivers/dma/qcom/hidma_mgmt.c | 9 +- drivers/of/irq.c | 1 + 7 files changed, 250 insertions(+), 85 deletions(-) -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe dmaengine" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
