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media: mali-c55: Bypass the Iridix Tonemap engine

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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 Pőcze <barnabas.pocze@ideasonboard.com>
Reviewed-by: Daniel Scally <dan.scally@ideasonboard.com>
Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>
This commit is contained in:
Jacopo Mondi 2026-03-11 12:15:56 +01:00 committed by Hans Verkuil
parent db7faf488e
commit 762ec66e13
1 changed files with 5 additions and 0 deletions
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5
drivers/media/platform/arm/mali-c55/mali-c55-params.c
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@ -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);