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author | Daniel Baluta <daniel.baluta@nxp.com> | 2020-11-11 13:11:18 +0200 |
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committer | Shawn Guo <shawnguo@kernel.org> | 2020-11-16 16:33:48 +0800 |
commit | 23d89aa0c2192f2d4582198b381d8805492c7925 (patch) | |
tree | a4f331d9c2613db9ca7ab53cc253d727902535e1 /drivers/clk/qcom/mss-sc7180.c | |
parent | 046326989a1845db321d3b3db637e1336383b047 (diff) |
firmware: imx-dsp: Export functions to request/free channels
In order to save power, we only need to request a channel
when the communication with the DSP active.
For this we export the following functions:
- imx_dsp_request_channel, gets a channel with a given index
- imx_dsp_free_channel, frees a channel with a given index
Notice that we still request channels at probe to support devices
that do not have PM callbacks implemented.
More explanations about why requesting a channel has an effect
on power savings:
- requesting an mailbox channel will call mailbox's startup
function.
- startup function calls pm_runtime_get_sync which increments device
usage count and will keep the device active. Specifically, mailbox
clock will be always ON when a mailbox channel is requested.
Signed-off-by: Daniel Baluta <daniel.baluta@nxp.com>
Reviewed-by: Paul Olaru <paul.olaru@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
Diffstat (limited to 'drivers/clk/qcom/mss-sc7180.c')
0 files changed, 0 insertions, 0 deletions