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Commit a7975cf8 authored Mar 21, 2017 by Skylar Chang

msm: gsi: add support for NOP xfers



To allow more efficient event ring completion, a NOP (No Operation)
transfer is introduced. The client can use this new descriptor type to
aggregate completion to transfer for TO_GSI based on some timer. When
client sends a NOP transfer to GSI with IEOT (End of transfer indication),
GSI will generate an event when this NOP descriptor was processed.

Change-Id: I3a47bef5c02fec5c63bb8c3e7e4fe8b44fa6986e
CRs-Fixed: 2022853
Acked-by: Ady Abraham <adya@qti.qualcomm.com>
Signed-off-by: Skylar Chang <chiaweic@codeaurora.org>

parent 8568eb9e

drivers/platform/msm/gsi/gsi.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -2360,6 +2360,8 @@ int gsi_queue_xfer(unsigned long chan_hdl, uint16_t num_xfers,
		tre.re_type = GSI_RE_XFER;
		} else if (xfer[i].type == GSI_XFER_ELEM_IMME_CMD) {
		tre.re_type = GSI_RE_IMMD_CMD;
		} else if (xfer[i].type == GSI_XFER_ELEM_NOP) {
		tre.re_type = GSI_RE_NOP;
		} else {
		GSIERR("chan_hdl=%lu bad RE type=%u\n", chan_hdl,
		xfer[i].type);

drivers/platform/msm/gsi/gsi.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -209,6 +209,7 @@ struct gsi_ctx {
		enum gsi_re_type {
		GSI_RE_XFER = 0x2,
		GSI_RE_IMMD_CMD = 0x3,
		GSI_RE_NOP = 0x4,
		};

		struct __packed gsi_tre {

include/linux/msm_gsi.h

+2 −0

Original line number	Diff line number	Diff line
		@@ -367,6 +367,7 @@ enum gsi_xfer_flag {
		enum gsi_xfer_elem_type {
		GSI_XFER_ELEM_DATA,
		GSI_XFER_ELEM_IMME_CMD,
		GSI_XFER_ELEM_NOP,
		};

		/**
		@@ -409,6 +410,7 @@ enum gsi_xfer_elem_type {
		*
		* GSI_XFER_ELEM_DATA: for all data transfers
		* GSI_XFER_ELEM_IMME_CMD: for IPA immediate commands
		* GSI_XFER_ELEM_NOP: for event generation only
		*
		* @xfer_user_data: cookie used in xfer_cb
		*