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author | Daniel Baluta <daniel.baluta@nxp.com> | 2019-12-20 11:05:31 -0600 |
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committer | Mark Brown <broonie@kernel.org> | 2019-12-24 23:57:29 +0000 |
commit | dcf08d0f8f09081b16f69071dd55d51d5e964e84 (patch) | |
tree | c2939451b6ff3b013dedb3efb696a8dfedd664eb /sound/soc/fsl | |
parent | dd836ddf4e4e1c7f1eb2ae44783ccd70872ef24e (diff) | |
download | linux-stable-dcf08d0f8f09081b16f69071dd55d51d5e964e84.tar.gz linux-stable-dcf08d0f8f09081b16f69071dd55d51d5e964e84.tar.bz2 linux-stable-dcf08d0f8f09081b16f69071dd55d51d5e964e84.zip |
ASoC: SOF: imx8: Fix dsp_box offset
dsp_box is used to keep DSP initiated messages. The value of dsp_offset
is set by the DSP with the first message, so we need a way to bootstrap
it in order to get the first message.
We do this by setting the correct default dsp_box offset which on i.MX8
is not zero.
Very interesting is why it has worked until now.
On i.MX8, DSP communicates with ARM core using a shared SDRAM memory
area. Actually, there are two shared areas:
* SDRAM0 - starting at 0x92400000, size 0x800000
* SDRAM1 - starting at 0x92C00000, size 0x800000
SDRAM0 keeps the data sections, starting with .rodata. By chance
fw_ready structure was placed at the beginning of .rodata.
dsp_box_base is defined as SDRAM0 + dsp_box_offset and it is placed
at the beginning of SDRAM1 (dsp_box_offset should be 0x800000). But
because it is zero initialized by default it points to SDRAM0 where
by chance the fw_ready was placed in the SOF firmware.
Anyhow, SOF commit 7466bee378dd811b ("clk: make freq arrays constant")
fw_ready is no longer at the beginning of SDRAM0 and everything shows
how lucky we were until now.
Fix this by properly setting the default dsp_box offset.
Fixes: 202acc565a1f050 ("ASoC: SOF: imx: Add i.MX8 HW support")
Signed-off-by: Daniel Baluta <daniel.baluta@nxp.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20191220170531.10423-1-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'sound/soc/fsl')
0 files changed, 0 insertions, 0 deletions