On Wed Mar 11 12:15:56 2026 +0100, Jacopo Mondi wrote:
> The Iridix Tonemap engine, if not bypassed, applies a digital gain
> in order to compensate under-exposed images.
>
> This however breaks the exposure and gain regulation performed on the
> sensor.
>
> If the Iridix Tonemap has to be used, it need to be supported in the
> ISP uAPI and properly configured by userspace.
>
> As the driver doesn't support it at the moment, bypass it by default.
>
> Reviewed-by: Barnabás PÅcze <[email protected]>
> Reviewed-by: Daniel Scally <[email protected]>
> Signed-off-by: Jacopo Mondi <[email protected]>
> Signed-off-by: Hans Verkuil <[email protected]>
Patch committed.
Thanks,
Hans Verkuil
drivers/media/platform/arm/mali-c55/mali-c55-params.c | 5 +++++
1 file changed, 5 insertions(+)
---
diff --git a/drivers/media/platform/arm/mali-c55/mali-c55-params.c
b/drivers/media/platform/arm/mali-c55/mali-c55-params.c
index 773e5b6a2b7e..b9fc904a3844 100644
--- a/drivers/media/platform/arm/mali-c55/mali-c55-params.c
+++ b/drivers/media/platform/arm/mali-c55/mali-c55-params.c
@@ -825,6 +825,11 @@ void mali_c55_params_init_isp_config(struct mali_c55
*mali_c55,
/* Disable the temper module's DMA read/write */
mali_c55_ctx_write(mali_c55, MALI_C55_REG_TEMPER_DMA_IO, 0x0);
+ /* Disable IRIDIX module. */
+ mali_c55_ctx_update_bits(mali_c55, MALI_C55_REG_BYPASS_3,
+ MALI_C55_REG_BYPASS_3_IRIDIX,
+ MALI_C55_REG_BYPASS_3_IRIDIX);
+
/* Bypass the colour noise reduction */
mali_c55_ctx_write(mali_c55, MALI_C55_REG_BYPASS_4,
MALI_C55_REG_BYPASS_4_CNR);
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