The mipi_csis_dump_regs() function reads and printout the interface
registers for debugging purposes.
Trying to access the registers without proper powering up the interface
causes the chip to hang.
Fix that by increasing the pm runtime usage count which, if necessary,
resumes the interface.
Signed-off-by: Jacopo Mondi <jacopo@xxxxxxxxxx>
---
drivers/staging/media/imx/imx7-mipi-csis.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/staging/media/imx/imx7-mipi-csis.c b/drivers/staging/media/imx/imx7-mipi-csis.c
index 2b73fa55c938..cb54bb7491d9 100644
--- a/drivers/staging/media/imx/imx7-mipi-csis.c
+++ b/drivers/staging/media/imx/imx7-mipi-csis.c
@@ -780,11 +780,15 @@ static int mipi_csis_dump_regs(struct csi_state *state)
dev_info(state->dev, "--- REGISTERS ---\n");
+ pm_runtime_resume_and_get(state->dev);
+
for (i = 0; i < ARRAY_SIZE(registers); i++) {
cfg = mipi_csis_read(state, registers[i].offset);
dev_info(state->dev, "%14s: 0x%08x\n", registers[i].name, cfg);
}
+ pm_runtime_put(state->dev);
+
return 0;
}
--
2.34.1
