[PATCH 0/6] media: mali-c55: Fix ISP reset and blocks bypass

[PATCH 0/6] media: mali-c55: Fix ISP reset and blocks bypass

[Jacopo Mondi]

The ISP is initialized in two different points (s_stream and probe).
This cause two consecutive start streaming to use settings from the
previous one.

Also, not all the blocks that userspace can configure are properly
reset.

Fix that and also bypass a few ISP blocks which if not bypassed might
interfere with the image processing.

Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>

---
Daniel Scally (1):
      media: mali-c55: Fix Iridix bypass macros

Jacopo Mondi (5):
      media: mali-c55: Fix wrong comment of ISP block types
      media: mali-c55: Initialize the ISP in enable_streams()
      media: mali-c55: Fully reset the ISP configuration
      media: mali-c55: Bypass the Iridix Tonemap engine
      media: mali-c55: Bypass Purple Fringe Correction

 .../media/platform/arm/mali-c55/mali-c55-common.h  |   2 +
 .../media/platform/arm/mali-c55/mali-c55-core.c    |  35 ------
 drivers/media/platform/arm/mali-c55/mali-c55-isp.c |  37 +-----
 .../media/platform/arm/mali-c55/mali-c55-params.c  | 134 ++++++++++++++++++++-
 .../platform/arm/mali-c55/mali-c55-registers.h     |   4 +-
 5 files changed, 140 insertions(+), 72 deletions(-)
---
base-commit: f6390408a846aacc2171c17d88b062e202d84e86
change-id: 20260311-mali-c55-fixes-v7-0-5db2a04ea818

Best regards,
-- 
Jacopo Mondi <jacopo.mondi@ideasonboard.com>

[PATCH 1/6] media: mali-c55: Fix wrong comment of ISP block types

[Jacopo Mondi]

Some bad copy&paste happened in the description of the ISP block types
and AWB_CONFIG got mixed up with SHADING_CONFIG.

Fix it by assigning to each block the correct type.

As only the comment is changed, there is no uABI breakage or regression.

Cc: stable@vger.kernel.org
Fixes: d5f281f3dd29 ("media: mali-c55: Add Mali-C55 ISP driver")
Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
---
 drivers/media/platform/arm/mali-c55/mali-c55-params.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

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 be0e909bcf29..c03a6120ddbf 100644
--- a/drivers/media/platform/arm/mali-c55/mali-c55-params.c
+++ b/drivers/media/platform/arm/mali-c55/mali-c55-params.c
@@ -43,9 +43,9 @@
  * @digital_gain:	For header->type == MALI_C55_PARAM_BLOCK_DIGITAL_GAIN
  * @awb_gains:		For header->type == MALI_C55_PARAM_BLOCK_AWB_GAINS and
  *			header->type = MALI_C55_PARAM_BLOCK_AWB_GAINS_AEXP
- * @awb_config:		For header->type == MALI_C55_PARAM_MESH_SHADING_CONFIG
- * @shading_config:	For header->type == MALI_C55_PARAM_MESH_SHADING_SELECTION
- * @shading_selection:	For header->type == MALI_C55_PARAM_BLOCK_SENSOR_OFFS
+ * @awb_config:		For header->type == MALI_C55_PARAM_BLOCK_AWB_CONFIG
+ * @shading_config:	For header->type == MALI_C55_PARAM_MESH_SHADING_CONFIG
+ * @shading_selection:	For header->type == MALI_C55_PARAM_MESH_SHADING_SELECTION
  * @data:		Allows easy initialisation of a union variable with a
  *			pointer into a __u8 array.
  */

-- 
2.53.0

Re: [PATCH 1/6] media: mali-c55: Fix wrong comment of ISP block types

[Dan Scally]

Hi Jacopo

On 13/03/2026 10:49, Jacopo Mondi wrote:
> Some bad copy&paste happened in the description of the ISP block types
> and AWB_CONFIG got mixed up with SHADING_CONFIG.
> 
> Fix it by assigning to each block the correct type.
> 
> As only the comment is changed, there is no uABI breakage or regression.
> 
> Cc: stable@vger.kernel.org
> Fixes: d5f281f3dd29 ("media: mali-c55: Add Mali-C55 ISP driver")
> Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
> ---

Reviewed-by: Daniel Scally <dan.scally@ideasonboard.com>

>   drivers/media/platform/arm/mali-c55/mali-c55-params.c | 6 +++---
>   1 file changed, 3 insertions(+), 3 deletions(-)
> 
> 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 be0e909bcf29..c03a6120ddbf 100644
> --- a/drivers/media/platform/arm/mali-c55/mali-c55-params.c
> +++ b/drivers/media/platform/arm/mali-c55/mali-c55-params.c
> @@ -43,9 +43,9 @@
>    * @digital_gain:	For header->type == MALI_C55_PARAM_BLOCK_DIGITAL_GAIN
>    * @awb_gains:		For header->type == MALI_C55_PARAM_BLOCK_AWB_GAINS and
>    *			header->type = MALI_C55_PARAM_BLOCK_AWB_GAINS_AEXP
> - * @awb_config:		For header->type == MALI_C55_PARAM_MESH_SHADING_CONFIG
> - * @shading_config:	For header->type == MALI_C55_PARAM_MESH_SHADING_SELECTION
> - * @shading_selection:	For header->type == MALI_C55_PARAM_BLOCK_SENSOR_OFFS
> + * @awb_config:		For header->type == MALI_C55_PARAM_BLOCK_AWB_CONFIG
> + * @shading_config:	For header->type == MALI_C55_PARAM_MESH_SHADING_CONFIG
> + * @shading_selection:	For header->type == MALI_C55_PARAM_MESH_SHADING_SELECTION
>    * @data:		Allows easy initialisation of a union variable with a
>    *			pointer into a __u8 array.
>    */
> 

[PATCH 2/6] media: mali-c55: Initialize the ISP in enable_streams()

[Jacopo Mondi]

The Mali C55 driver initializes the ISP in two points:

1) At probe time it disables ISP blocks by configuring them in bypass
   mode
2) At enable_streams() it initializes the crop rectangles and the image
   processing pipeline using the current image format

However, as ISP blocks are configured by userspace, if their
configuration is not reset, from the second enable_streams() call
onwards the ISP configuration will depend on the previous streaming
session configuration.

To re-initialize the ISP completely at enable_strems() time consolidate
the ISP block bypass configuration and the image processing path
configuration in a single function to be called at enabled_streams()
time.

Cc: stable@vger.kernel.org
Fixes: d5f281f3dd29 ("media: mali-c55: Add Mali-C55 ISP driver")
Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
---
 .../media/platform/arm/mali-c55/mali-c55-common.h  |  2 +
 .../media/platform/arm/mali-c55/mali-c55-core.c    | 35 -----------
 drivers/media/platform/arm/mali-c55/mali-c55-isp.c | 37 ++---------
 .../media/platform/arm/mali-c55/mali-c55-params.c  | 72 ++++++++++++++++++++++
 4 files changed, 79 insertions(+), 67 deletions(-)

diff --git a/drivers/media/platform/arm/mali-c55/mali-c55-common.h b/drivers/media/platform/arm/mali-c55/mali-c55-common.h
index 31c1deaca146..13a3e9dc4243 100644
--- a/drivers/media/platform/arm/mali-c55/mali-c55-common.h
+++ b/drivers/media/platform/arm/mali-c55/mali-c55-common.h
@@ -306,5 +306,7 @@ bool mali_c55_pipeline_ready(struct mali_c55 *mali_c55);
 void mali_c55_stats_fill_buffer(struct mali_c55 *mali_c55,
 				enum mali_c55_config_spaces cfg_space);
 void mali_c55_params_write_config(struct mali_c55 *mali_c55);
+void mali_c55_params_init_isp_config(struct mali_c55 *mali_c55,
+				     const struct v4l2_subdev_state *state);
 
 #endif /* _MALI_C55_COMMON_H */
diff --git a/drivers/media/platform/arm/mali-c55/mali-c55-core.c b/drivers/media/platform/arm/mali-c55/mali-c55-core.c
index 43b834459ccf..c1a562cd214e 100644
--- a/drivers/media/platform/arm/mali-c55/mali-c55-core.c
+++ b/drivers/media/platform/arm/mali-c55/mali-c55-core.c
@@ -663,41 +663,6 @@ static int mali_c55_init_context(struct mali_c55 *mali_c55,
 		      mali_c55->base + config_space_addrs[MALI_C55_CONFIG_PING],
 		      MALI_C55_CONFIG_SPACE_SIZE);
 
-	/*
-	 * Some features of the ISP need to be disabled by default and only
-	 * enabled at the same time as they're configured by a parameters buffer
-	 */
-
-	/* Bypass the sqrt and square compression and expansion modules */
-	mali_c55_ctx_update_bits(mali_c55, MALI_C55_REG_BYPASS_1,
-				 MALI_C55_REG_BYPASS_1_FE_SQRT,
-				 MALI_C55_REG_BYPASS_1_FE_SQRT);
-	mali_c55_ctx_update_bits(mali_c55, MALI_C55_REG_BYPASS_3,
-				 MALI_C55_REG_BYPASS_3_SQUARE_BE,
-				 MALI_C55_REG_BYPASS_3_SQUARE_BE);
-
-	/* Bypass the temper module */
-	mali_c55_ctx_write(mali_c55, MALI_C55_REG_BYPASS_2,
-			   MALI_C55_REG_BYPASS_2_TEMPER);
-
-	/* Disable the temper module's DMA read/write */
-	mali_c55_ctx_write(mali_c55, MALI_C55_REG_TEMPER_DMA_IO, 0x0);
-
-	/* Bypass the colour noise reduction  */
-	mali_c55_ctx_write(mali_c55, MALI_C55_REG_BYPASS_4,
-			   MALI_C55_REG_BYPASS_4_CNR);
-
-	/* Disable the sinter module */
-	mali_c55_ctx_update_bits(mali_c55, MALI_C55_REG_SINTER_CONFIG,
-				 MALI_C55_SINTER_ENABLE_MASK, 0);
-
-	/* Disable the RGB Gamma module for each output */
-	mali_c55_ctx_write(mali_c55, MALI_C55_REG_FR_GAMMA_RGB_ENABLE, 0);
-	mali_c55_ctx_write(mali_c55, MALI_C55_REG_DS_GAMMA_RGB_ENABLE, 0);
-
-	/* Disable the colour correction matrix */
-	mali_c55_ctx_write(mali_c55, MALI_C55_REG_CCM_ENABLE, 0);
-
 	return 0;
 }
 
diff --git a/drivers/media/platform/arm/mali-c55/mali-c55-isp.c b/drivers/media/platform/arm/mali-c55/mali-c55-isp.c
index 497f25fbdd13..4c0fd1ec741c 100644
--- a/drivers/media/platform/arm/mali-c55/mali-c55-isp.c
+++ b/drivers/media/platform/arm/mali-c55/mali-c55-isp.c
@@ -112,9 +112,6 @@ static int mali_c55_isp_start(struct mali_c55 *mali_c55,
 			      const struct v4l2_subdev_state *state)
 {
 	struct mali_c55_context *ctx = mali_c55_get_active_context(mali_c55);
-	const struct mali_c55_isp_format_info *cfg;
-	const struct v4l2_mbus_framefmt *format;
-	const struct v4l2_rect *crop;
 	u32 val;
 	int ret;
 
@@ -122,35 +119,11 @@ static int mali_c55_isp_start(struct mali_c55 *mali_c55,
 			     MALI_C55_REG_MCU_CONFIG_WRITE_MASK,
 			     MALI_C55_REG_MCU_CONFIG_WRITE_PING);
 
-	/* Apply input windowing */
-	crop = v4l2_subdev_state_get_crop(state, MALI_C55_ISP_PAD_SINK_VIDEO);
-	format = v4l2_subdev_state_get_format(state,
-					      MALI_C55_ISP_PAD_SINK_VIDEO);
-	cfg = mali_c55_isp_get_mbus_config_by_code(format->code);
-
-	mali_c55_write(mali_c55, MALI_C55_REG_HC_START,
-		       MALI_C55_HC_START(crop->left));
-	mali_c55_write(mali_c55, MALI_C55_REG_HC_SIZE,
-		       MALI_C55_HC_SIZE(crop->width));
-	mali_c55_write(mali_c55, MALI_C55_REG_VC_START_SIZE,
-		       MALI_C55_VC_START(crop->top) |
-		       MALI_C55_VC_SIZE(crop->height));
-	mali_c55_ctx_update_bits(mali_c55, MALI_C55_REG_BASE_ADDR,
-				 MALI_C55_REG_ACTIVE_WIDTH_MASK, format->width);
-	mali_c55_ctx_update_bits(mali_c55, MALI_C55_REG_BASE_ADDR,
-				 MALI_C55_REG_ACTIVE_HEIGHT_MASK,
-				 format->height << 16);
-	mali_c55_ctx_update_bits(mali_c55, MALI_C55_REG_BAYER_ORDER,
-				 MALI_C55_BAYER_ORDER_MASK, cfg->order);
-	mali_c55_ctx_update_bits(mali_c55, MALI_C55_REG_INPUT_WIDTH,
-				 MALI_C55_INPUT_WIDTH_MASK,
-				 MALI_C55_INPUT_WIDTH_20BIT);
-
-	mali_c55_ctx_update_bits(mali_c55, MALI_C55_REG_ISP_RAW_BYPASS,
-				 MALI_C55_ISP_RAW_BYPASS_BYPASS_MASK,
-				 cfg->bypass ? MALI_C55_ISP_RAW_BYPASS_BYPASS_MASK :
-					     0x00);
-
+	/*
+	 * Apply default ISP configuration and the apply configurations from
+	 * the first available parameters buffer.
+	 */
+	mali_c55_params_init_isp_config(mali_c55, state);
 	mali_c55_params_write_config(mali_c55);
 	ret = mali_c55_config_write(ctx, MALI_C55_CONFIG_PING, true);
 	if (ret) {
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 c03a6120ddbf..c84a6047a570 100644
--- a/drivers/media/platform/arm/mali-c55/mali-c55-params.c
+++ b/drivers/media/platform/arm/mali-c55/mali-c55-params.c
@@ -732,6 +732,78 @@ void mali_c55_params_write_config(struct mali_c55 *mali_c55)
 	vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_DONE);
 }
 
+void mali_c55_params_init_isp_config(struct mali_c55 *mali_c55,
+				     const struct v4l2_subdev_state *state)
+{
+	const struct mali_c55_isp_format_info *cfg;
+	const struct v4l2_mbus_framefmt *format;
+	const struct v4l2_rect *crop;
+
+	/* Apply input windowing */
+	crop = v4l2_subdev_state_get_crop(state, MALI_C55_ISP_PAD_SINK_VIDEO);
+	format = v4l2_subdev_state_get_format(state,
+					      MALI_C55_ISP_PAD_SINK_VIDEO);
+	cfg = mali_c55_isp_get_mbus_config_by_code(format->code);
+
+	mali_c55_write(mali_c55, MALI_C55_REG_HC_START,
+		       MALI_C55_HC_START(crop->left));
+	mali_c55_write(mali_c55, MALI_C55_REG_HC_SIZE,
+		       MALI_C55_HC_SIZE(crop->width));
+	mali_c55_write(mali_c55, MALI_C55_REG_VC_START_SIZE,
+		       MALI_C55_VC_START(crop->top) |
+		       MALI_C55_VC_SIZE(crop->height));
+	mali_c55_ctx_update_bits(mali_c55, MALI_C55_REG_BASE_ADDR,
+				 MALI_C55_REG_ACTIVE_WIDTH_MASK, format->width);
+	mali_c55_ctx_update_bits(mali_c55, MALI_C55_REG_BASE_ADDR,
+				 MALI_C55_REG_ACTIVE_HEIGHT_MASK,
+				 format->height << 16);
+	mali_c55_ctx_update_bits(mali_c55, MALI_C55_REG_BAYER_ORDER,
+				 MALI_C55_BAYER_ORDER_MASK, cfg->order);
+	mali_c55_ctx_update_bits(mali_c55, MALI_C55_REG_INPUT_WIDTH,
+				 MALI_C55_INPUT_WIDTH_MASK,
+				 MALI_C55_INPUT_WIDTH_20BIT);
+
+	mali_c55_ctx_update_bits(mali_c55, MALI_C55_REG_ISP_RAW_BYPASS,
+				 MALI_C55_ISP_RAW_BYPASS_BYPASS_MASK,
+				 cfg->bypass ? MALI_C55_ISP_RAW_BYPASS_BYPASS_MASK :
+					     0x00);
+
+	/*
+	 * Some features of the ISP need to be disabled by default and only
+	 * enabled at the same time as they're configured by a parameters buffer
+	 */
+
+	/* Bypass the sqrt and square compression and expansion modules */
+	mali_c55_ctx_update_bits(mali_c55, MALI_C55_REG_BYPASS_1,
+				 MALI_C55_REG_BYPASS_1_FE_SQRT,
+				 MALI_C55_REG_BYPASS_1_FE_SQRT);
+	mali_c55_ctx_update_bits(mali_c55, MALI_C55_REG_BYPASS_3,
+				 MALI_C55_REG_BYPASS_3_SQUARE_BE,
+				 MALI_C55_REG_BYPASS_3_SQUARE_BE);
+
+	/* Bypass the temper module */
+	mali_c55_ctx_write(mali_c55, MALI_C55_REG_BYPASS_2,
+			   MALI_C55_REG_BYPASS_2_TEMPER);
+
+	/* Disable the temper module's DMA read/write */
+	mali_c55_ctx_write(mali_c55, MALI_C55_REG_TEMPER_DMA_IO, 0x0);
+
+	/* Bypass the colour noise reduction  */
+	mali_c55_ctx_write(mali_c55, MALI_C55_REG_BYPASS_4,
+			   MALI_C55_REG_BYPASS_4_CNR);
+
+	/* Disable the sinter module */
+	mali_c55_ctx_update_bits(mali_c55, MALI_C55_REG_SINTER_CONFIG,
+				 MALI_C55_SINTER_ENABLE_MASK, 0);
+
+	/* Disable the RGB Gamma module for each output */
+	mali_c55_ctx_write(mali_c55, MALI_C55_REG_FR_GAMMA_RGB_ENABLE, 0);
+	mali_c55_ctx_write(mali_c55, MALI_C55_REG_DS_GAMMA_RGB_ENABLE, 0);
+
+	/* Disable the colour correction matrix */
+	mali_c55_ctx_write(mali_c55, MALI_C55_REG_CCM_ENABLE, 0);
+}
+
 void mali_c55_unregister_params(struct mali_c55 *mali_c55)
 {
 	struct mali_c55_params *params = &mali_c55->params;

-- 
2.53.0

[PATCH 3/6] media: mali-c55: Fully reset the ISP configuration

[Jacopo Mondi]

The Mali C55 driver uses an auto-suspend delay of 2000 milli-seconds.

As the delay is quite large, it is certainly possible that two
consecutive calls to enable_streams() do not go through a suspend of the
peripheral, meaning we cannot rely on POW register values for the ISP
configuration.

To prevent a streaming session to be initialized with settings from the
previous one, reset the full ISP configuration to know state disabling or
bypassing all the ISP blocks the driver supports.

Cc: stable@vger.kernel.org
Fixes: d5f281f3dd29 ("media: mali-c55: Add Mali-C55 ISP driver")
Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
---
 .../media/platform/arm/mali-c55/mali-c55-params.c  | 50 ++++++++++++++++++++++
 1 file changed, 50 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 c84a6047a570..773e5b6a2b7e 100644
--- a/drivers/media/platform/arm/mali-c55/mali-c55-params.c
+++ b/drivers/media/platform/arm/mali-c55/mali-c55-params.c
@@ -781,6 +781,43 @@ void mali_c55_params_init_isp_config(struct mali_c55 *mali_c55,
 				 MALI_C55_REG_BYPASS_3_SQUARE_BE,
 				 MALI_C55_REG_BYPASS_3_SQUARE_BE);
 
+	/* Bypass the sensor offset correction (BLS) module */
+	mali_c55_ctx_update_bits(mali_c55, MALI_C55_REG_BYPASS_3,
+		MALI_C55_REG_BYPASS_3_SENSOR_OFFSET_PRE_SH,
+		MALI_C55_REG_BYPASS_3_SENSOR_OFFSET_PRE_SH);
+
+	/* Configure 1x digital gain. */
+	mali_c55_ctx_update_bits(mali_c55, MALI_C55_REG_DIGITAL_GAIN,
+				 MALI_C55_DIGITAL_GAIN_MASK, 256);
+
+	/* Set all AWB gains to 1x. at both AWB configuration points*/
+	mali_c55_ctx_update_bits(mali_c55, MALI_C55_REG_AWB_GAINS1,
+				 MALI_C55_AWB_GAIN00_MASK, 256);
+	mali_c55_ctx_update_bits(mali_c55, MALI_C55_REG_AWB_GAINS1,
+				 MALI_C55_AWB_GAIN01_MASK,
+				 MALI_C55_AWB_GAIN01(256));
+	mali_c55_ctx_update_bits(mali_c55, MALI_C55_REG_AWB_GAINS2,
+				 MALI_C55_AWB_GAIN10_MASK, 256);
+	mali_c55_ctx_update_bits(mali_c55, MALI_C55_REG_AWB_GAINS2,
+				 MALI_C55_AWB_GAIN11_MASK,
+				 MALI_C55_AWB_GAIN11(256));
+
+	mali_c55_ctx_update_bits(mali_c55, MALI_C55_REG_AWB_GAINS1_AEXP,
+				 MALI_C55_AWB_GAIN00_MASK, 256);
+	mali_c55_ctx_update_bits(mali_c55, MALI_C55_REG_AWB_GAINS1_AEXP,
+				 MALI_C55_AWB_GAIN01_MASK,
+				 MALI_C55_AWB_GAIN01(256));
+	mali_c55_ctx_update_bits(mali_c55, MALI_C55_REG_AWB_GAINS2_AEXP,
+				 MALI_C55_AWB_GAIN10_MASK, 256);
+	mali_c55_ctx_update_bits(mali_c55, MALI_C55_REG_AWB_GAINS2_AEXP,
+				 MALI_C55_AWB_GAIN11_MASK,
+				 MALI_C55_AWB_GAIN11(256));
+
+	/* Bypass mesh shading corrections (LSC). */
+	mali_c55_ctx_update_bits(mali_c55, MALI_C55_REG_MESH_SHADING_CONFIG,
+				 MALI_C55_MESH_SHADING_ENABLE_MASK,
+				 false);
+
 	/* Bypass the temper module */
 	mali_c55_ctx_write(mali_c55, MALI_C55_REG_BYPASS_2,
 			   MALI_C55_REG_BYPASS_2_TEMPER);
@@ -802,6 +839,19 @@ void mali_c55_params_init_isp_config(struct mali_c55 *mali_c55,
 
 	/* Disable the colour correction matrix */
 	mali_c55_ctx_write(mali_c55, MALI_C55_REG_CCM_ENABLE, 0);
+
+	/* Disable AWB stats. */
+	mali_c55_ctx_update_bits(mali_c55, MALI_C55_REG_METERING_CONFIG,
+				 MALI_C55_AWB_DISABLE_MASK,
+				 MALI_C55_AWB_DISABLE_MASK);
+
+	/* Disable auto-exposure 1024-bin histograms at both tap points. */
+	mali_c55_ctx_update_bits(mali_c55, MALI_C55_REG_METERING_CONFIG,
+				 MALI_C55_AEXP_HIST_DISABLE_MASK,
+				 MALI_C55_AEXP_HIST_DISABLE);
+	mali_c55_ctx_update_bits(mali_c55, MALI_C55_REG_METERING_CONFIG,
+				 MALI_C55_AEXP_IHIST_DISABLE_MASK,
+				 MALI_C55_AEXP_IHIST_DISABLE);
 }
 
 void mali_c55_unregister_params(struct mali_c55 *mali_c55)

-- 
2.53.0

[PATCH 4/6] media: mali-c55: Fix Iridix bypass macros

[Jacopo Mondi]

From: Daniel Scally <dan.scally@ideasonboard.com>

The Mali C55 Iridix block has a digital gain function and tone mapping
function, whose enablement is controlled by two different bits
in the BYPASS_3 register.

Unfortunately, the "Gain" and "Tonemap" bypass bit definitions are the
wrong way around. Swap them so that the ISP is now operated with the
"Iridix Gain" block enabled and default configured at a x1.0 gain and
with the "Iridix Tonemap" disabled, as it was originally intended.

Cc: stable@vger.kernel.org
Fixes: 8ec187829a4c ("media: mali-c55: Fix Iridix bypass macros")
Signed-off-by: Daniel Scally <dan.scally@ideasonboard.com>
Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
---
 drivers/media/platform/arm/mali-c55/mali-c55-registers.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/media/platform/arm/mali-c55/mali-c55-registers.h b/drivers/media/platform/arm/mali-c55/mali-c55-registers.h
index f5a148add1c8..f098effde7b4 100644
--- a/drivers/media/platform/arm/mali-c55/mali-c55-registers.h
+++ b/drivers/media/platform/arm/mali-c55/mali-c55-registers.h
@@ -128,8 +128,8 @@ enum mali_c55_interrupts {
 #define MALI_C55_REG_BYPASS_3_SENSOR_OFFSET_PRE_SH	BIT(1)
 #define MALI_C55_REG_BYPASS_3_MESH_SHADING		BIT(3)
 #define MALI_C55_REG_BYPASS_3_WHITE_BALANCE		BIT(4)
-#define MALI_C55_REG_BYPASS_3_IRIDIX			BIT(5)
-#define MALI_C55_REG_BYPASS_3_IRIDIX_GAIN		BIT(6)
+#define MALI_C55_REG_BYPASS_3_IRIDIX_GAIN		BIT(5)
+#define MALI_C55_REG_BYPASS_3_IRIDIX			BIT(6)
 #define MALI_C55_REG_BYPASS_4				0x18ec0
 #define MALI_C55_REG_BYPASS_4_DEMOSAIC_RGB		BIT(1)
 #define MALI_C55_REG_BYPASS_4_PF_CORRECTION		BIT(3)

-- 
2.53.0

Re: [PATCH 4/6] media: mali-c55: Fix Iridix bypass macros

[Barnabás Pőcze]

2026. 03. 13. 11:49 keltezéssel, Jacopo Mondi írta:
> From: Daniel Scally <dan.scally@ideasonboard.com>
> 
> The Mali C55 Iridix block has a digital gain function and tone mapping
> function, whose enablement is controlled by two different bits
> in the BYPASS_3 register.
> 
> Unfortunately, the "Gain" and "Tonemap" bypass bit definitions are the
> wrong way around. Swap them so that the ISP is now operated with the
> "Iridix Gain" block enabled and default configured at a x1.0 gain and
> with the "Iridix Tonemap" disabled, as it was originally intended.

As far as I can see the current upstream driver does not bypass either of them,
so swapping them will have no direct effect.


> 
> Cc: stable@vger.kernel.org
> Fixes: 8ec187829a4c ("media: mali-c55: Fix Iridix bypass macros")

Where is this commit? I cannot seem to find it.


Reviewed-by: Barnabás Pőcze <barnabas.pocze@ideasonboard.com>


> Signed-off-by: Daniel Scally <dan.scally@ideasonboard.com>
> Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
> ---
>   drivers/media/platform/arm/mali-c55/mali-c55-registers.h | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/media/platform/arm/mali-c55/mali-c55-registers.h b/drivers/media/platform/arm/mali-c55/mali-c55-registers.h
> index f5a148add1c8..f098effde7b4 100644
> --- a/drivers/media/platform/arm/mali-c55/mali-c55-registers.h
> +++ b/drivers/media/platform/arm/mali-c55/mali-c55-registers.h
> @@ -128,8 +128,8 @@ enum mali_c55_interrupts {
>   #define MALI_C55_REG_BYPASS_3_SENSOR_OFFSET_PRE_SH	BIT(1)
>   #define MALI_C55_REG_BYPASS_3_MESH_SHADING		BIT(3)
>   #define MALI_C55_REG_BYPASS_3_WHITE_BALANCE		BIT(4)
> -#define MALI_C55_REG_BYPASS_3_IRIDIX			BIT(5)
> -#define MALI_C55_REG_BYPASS_3_IRIDIX_GAIN		BIT(6)
> +#define MALI_C55_REG_BYPASS_3_IRIDIX_GAIN		BIT(5)
> +#define MALI_C55_REG_BYPASS_3_IRIDIX			BIT(6)
>   #define MALI_C55_REG_BYPASS_4				0x18ec0
>   #define MALI_C55_REG_BYPASS_4_DEMOSAIC_RGB		BIT(1)
>   #define MALI_C55_REG_BYPASS_4_PF_CORRECTION		BIT(3)
> 

Re: [PATCH 4/6] media: mali-c55: Fix Iridix bypass macros

[Jacopo Mondi]

On Fri, Mar 13, 2026 at 12:15:10PM +0100, Barnabás Pőcze wrote:
> 2026. 03. 13. 11:49 keltezéssel, Jacopo Mondi írta:
> > From: Daniel Scally <dan.scally@ideasonboard.com>
> >
> > The Mali C55 Iridix block has a digital gain function and tone mapping
> > function, whose enablement is controlled by two different bits
> > in the BYPASS_3 register.
> >
> > Unfortunately, the "Gain" and "Tonemap" bypass bit definitions are the
> > wrong way around. Swap them so that the ISP is now operated with the
> > "Iridix Gain" block enabled and default configured at a x1.0 gain and
> > with the "Iridix Tonemap" disabled, as it was originally intended.
>
> As far as I can see the current upstream driver does not bypass either of them,
> so swapping them will have no direct effect.

You're right, I swapped the patch order and in this version I sent out
this comes before the actual iridix bypass

>
>
> >
> > Cc: stable@vger.kernel.org
> > Fixes: 8ec187829a4c ("media: mali-c55: Fix Iridix bypass macros")
>
> Where is this commit? I cannot seem to find it.

Clearly, this doesn't make sense. I generated the fixes tag pointing
it to this patch. I'll fix, thanks.

>
>
> Reviewed-by: Barnabás Pőcze <barnabas.pocze@ideasonboard.com>
>
>
> > Signed-off-by: Daniel Scally <dan.scally@ideasonboard.com>
> > Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
> > ---
> >   drivers/media/platform/arm/mali-c55/mali-c55-registers.h | 4 ++--
> >   1 file changed, 2 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/media/platform/arm/mali-c55/mali-c55-registers.h b/drivers/media/platform/arm/mali-c55/mali-c55-registers.h
> > index f5a148add1c8..f098effde7b4 100644
> > --- a/drivers/media/platform/arm/mali-c55/mali-c55-registers.h
> > +++ b/drivers/media/platform/arm/mali-c55/mali-c55-registers.h
> > @@ -128,8 +128,8 @@ enum mali_c55_interrupts {
> >   #define MALI_C55_REG_BYPASS_3_SENSOR_OFFSET_PRE_SH	BIT(1)
> >   #define MALI_C55_REG_BYPASS_3_MESH_SHADING		BIT(3)
> >   #define MALI_C55_REG_BYPASS_3_WHITE_BALANCE		BIT(4)
> > -#define MALI_C55_REG_BYPASS_3_IRIDIX			BIT(5)
> > -#define MALI_C55_REG_BYPASS_3_IRIDIX_GAIN		BIT(6)
> > +#define MALI_C55_REG_BYPASS_3_IRIDIX_GAIN		BIT(5)
> > +#define MALI_C55_REG_BYPASS_3_IRIDIX			BIT(6)
> >   #define MALI_C55_REG_BYPASS_4				0x18ec0
> >   #define MALI_C55_REG_BYPASS_4_DEMOSAIC_RGB		BIT(1)
> >   #define MALI_C55_REG_BYPASS_4_PF_CORRECTION		BIT(3)
> >
>

[PATCH 5/6] media: mali-c55: Bypass the Iridix Tonemap engine

[Jacopo Mondi]

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.

Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
---
 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);

-- 
2.53.0

[PATCH 6/6] media: mali-c55: Bypass Purple Fringe Correction

[Jacopo Mondi]

The Purple Fringe Correction module is enable by default with a POR
configuration which might not be correct for the lens/sensor combination
in use.

If the Purple Fringe Correction module has to be used, it needs to be
supported in the driver's uAPI and properly configured by userspace.

As the driver doesn't support it at the moment, bypass it by default.

Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
---
 drivers/media/platform/arm/mali-c55/mali-c55-params.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

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 b9fc904a3844..de0e9d898db7 100644
--- a/drivers/media/platform/arm/mali-c55/mali-c55-params.c
+++ b/drivers/media/platform/arm/mali-c55/mali-c55-params.c
@@ -830,9 +830,10 @@ void mali_c55_params_init_isp_config(struct mali_c55 *mali_c55,
 				 MALI_C55_REG_BYPASS_3_IRIDIX,
 				 MALI_C55_REG_BYPASS_3_IRIDIX);
 
-	/* Bypass the colour noise reduction  */
+	/* Bypass the colour noise reduction and the PF modules  */
 	mali_c55_ctx_write(mali_c55, MALI_C55_REG_BYPASS_4,
-			   MALI_C55_REG_BYPASS_4_CNR);
+			   MALI_C55_REG_BYPASS_4_CNR |
+			   MALI_C55_REG_BYPASS_4_PF_CORRECTION);
 
 	/* Disable the sinter module */
 	mali_c55_ctx_update_bits(mali_c55, MALI_C55_REG_SINTER_CONFIG,

-- 
2.53.0

Re: [PATCH 6/6] media: mali-c55: Bypass Purple Fringe Correction

[Barnabás Pőcze]

2026. 03. 13. 11:49 keltezéssel, Jacopo Mondi írta:
> The Purple Fringe Correction module is enable by default with a POR
                                          enabled


> configuration which might not be correct for the lens/sensor combination
> in use.
> 
> If the Purple Fringe Correction module has to be used, it needs to be
> supported in the driver's uAPI and properly configured by userspace.
> 
> As the driver doesn't support it at the moment, bypass it by default.
> 
> Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
> ---

Reviewed-by: Barnabás Pőcze <barnabas.pocze@ideasonboard.com>


>   drivers/media/platform/arm/mali-c55/mali-c55-params.c | 5 +++--
>   1 file changed, 3 insertions(+), 2 deletions(-)
> 
> 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 b9fc904a3844..de0e9d898db7 100644
> --- a/drivers/media/platform/arm/mali-c55/mali-c55-params.c
> +++ b/drivers/media/platform/arm/mali-c55/mali-c55-params.c
> @@ -830,9 +830,10 @@ void mali_c55_params_init_isp_config(struct mali_c55 *mali_c55,
>   				 MALI_C55_REG_BYPASS_3_IRIDIX,
>   				 MALI_C55_REG_BYPASS_3_IRIDIX);
>   
> -	/* Bypass the colour noise reduction  */
> +	/* Bypass the colour noise reduction and the PF modules  */
>   	mali_c55_ctx_write(mali_c55, MALI_C55_REG_BYPASS_4,
> -			   MALI_C55_REG_BYPASS_4_CNR);
> +			   MALI_C55_REG_BYPASS_4_CNR |
> +			   MALI_C55_REG_BYPASS_4_PF_CORRECTION);
>   
>   	/* Disable the sinter module */
>   	mali_c55_ctx_update_bits(mali_c55, MALI_C55_REG_SINTER_CONFIG,
>