[PATCH v4 0/2] media: mali-c55: Add support for CCM and Gamma

[Jacopo Mondi]

Add support for Ccm and Gamma to the Mali-C55 ISP by defining the
corresponding blocks in the uAPI and implementing their handling in
the driver.

v3 implements validation of CCM and Gamma parameters using the new
block_validate() callback from v4l2-isp.

I kept the two patches unsquashed, to discuss if it is worth validating
the fields or we should rely on masking before writing to registers.

And in fact in v4 I removed them again but I expanded the documentation
a little to explicit mention the bitwidth of each field

Bonus: pahole output for the two new uAPI members

struct mali_c55_params_ccm {
	struct v4l2_isp_params_block_header header __attribute__((__aligned__(8))); /*     0     8 */
	__u16                      coeffs[3][3];         /*     8    18 */
	__u16                      gains[3];             /*    26     6 */
	__u16                      offs[3];              /*    32     6 */

	/* size: 40, cachelines: 1, members: 4 */
	/* padding: 2 */
	/* forced alignments: 1 */
	/* last cacheline: 40 bytes */
} __attribute__((__aligned__(8)));

struct mali_c55_params_gamma {
	struct v4l2_isp_params_block_header header __attribute__((__aligned__(8))); /*     0     8 */
	__u16                      gains[3];             /*     8     6 */
	__u16                      offs[3];              /*    14     6 */
	__u32                      lut[129];             /*    20   516 */

	/* size: 536, cachelines: 9, members: 4 */
	/* forced alignments: 1 */
	/* last cacheline: 24 bytes */
} __attribute__((__aligned__(8)));

Thanks
   j

Signed-off-by: Jacopo Mondi <jacopo.mondi+renesas@xxxxxxxxxxxxxxxx>
---
Changes in v4:
- Rebase on media-committers next
- Drop validation patches
- Explicily mention the bit width of each field in uAPI
- Link to v3: https://lore.kernel.org/r/20260627-mali-c55-ccm-gamma-v3-0-113584c05174@xxxxxxxxxxxxxxxx

Changes in v3:
- Address review comments from Linus and Vincenzo (changelog per patch)
- Rebase on top of
  "[PATCH v3 0/6] media: v4l2-isp: Add support for extensible statistics"
  https://patchwork.linuxtv.org/project/linux-media/list/?series=26929
  to perform per-block validation
- Add 2 patches for validating CCM and Gamma parameters
- Collect tags
- Link to v2: https://lore.kernel.org/r/20260616-mali-c55-ccm-gamma-v2-0-0f93e9a95d98@xxxxxxxxxxxxxxxx

Changes in v2:
- remove unused 'rgb_enable' in gamma uapi
- address checkpatch issues
- Link to v1: https://lore.kernel.org/r/20260616-mali-c55-ccm-gamma-v1-0-174fe4fedea3@xxxxxxxxxxxxxxxx

---
Jacopo Mondi (2):
      media: mali-c55: Add support for CCM
      media: mali-c55: Add support for RGB Gamma

 .../media/platform/arm/mali-c55/mali-c55-params.c  | 127 +++++++++++++++++++++
 .../platform/arm/mali-c55/mali-c55-registers.h     |  13 ++-
 include/uapi/linux/media/arm/mali-c55-config.h     |  86 +++++++++++++-
 3 files changed, 221 insertions(+), 5 deletions(-)
---
base-commit: a1d83d1b810665bd53ce8a7b7867e054d68676c7
change-id: 20260616-mali-c55-ccm-gamma-c02a0df59f98

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