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authorDaniel Baluta <daniel.baluta@nxp.com>2019-12-20 20:05:31 +0300
committerMark Brown <broonie@kernel.org>2019-12-25 02:57:29 +0300
commitdcf08d0f8f09081b16f69071dd55d51d5e964e84 (patch)
treec2939451b6ff3b013dedb3efb696a8dfedd664eb /sound/soc
parentdd836ddf4e4e1c7f1eb2ae44783ccd70872ef24e (diff)
downloadlinux-dcf08d0f8f09081b16f69071dd55d51d5e964e84.tar.xz
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')
-rw-r--r--sound/soc/sof/imx/imx8.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/sound/soc/sof/imx/imx8.c b/sound/soc/sof/imx/imx8.c
index 9d926b1df0d7..aef6ca167b9c 100644
--- a/sound/soc/sof/imx/imx8.c
+++ b/sound/soc/sof/imx/imx8.c
@@ -304,6 +304,9 @@ static int imx8_probe(struct snd_sof_dev *sdev)
}
sdev->mailbox_bar = SOF_FW_BLK_TYPE_SRAM;
+ /* set default mailbox offset for FW ready message */
+ sdev->dsp_box.offset = MBOX_OFFSET;
+
return 0;
exit_pdev_unregister: