[v3,2/2] media: rcar-vin: Add support for R-Car V4M

Commit Message

Niklas Söderlund June 19, 2024, 3:35 p.m. UTC

Add support for R-Car V4M. The V4M is similar to the other Gen4 SoC
supported V4H, and uses the ISP Channel Selector as its only possible
video input source.

The datasheet for the two SoCs have small nuances around the Pre-Clip
registers ELPrC and EPPrC in three use-cases, interlaced images,
embedded data and RAW8 input. On V4H the values written to the registers
are based on odd numbers while on V4M they are even numbers, based on
the input image size.

No board that uses these SoCs which also have the external peripherals
to test these nuances exists. Most likely this is an issue in the
datasheet, but to make this easy to address in the future do not add a
common Gen4 fallback compatible. Instead uses SoC specific compatibles
for both SoCs. This is what was done for Gen3 SoCs, which also had
similar nuances in the register documentation.

Signed-off-by: Niklas Söderlund <[e-mail]>
Reviewed-by: Geert Uytterhoeven <[e-mail]>
Reviewed-by: Laurent Pinchart <[e-mail]>
---
* Changes since v2
- Extend commit message to explain why SoC specific compatibles are use
  in the driver instead of adding a new Gen4 fallback to cover both V4H
  and V4M.
- Add review tags.

* Changes since v1
- Create a shared Gen4 info strucutre.
---
 drivers/media/platform/renesas/rcar-vin/rcar-core.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

Patch

diff --git a/drivers/media/platform/renesas/rcar-vin/rcar-core.c b/drivers/media/platform/renesas/rcar-vin/rcar-core.c
index 809c3a38cc4a..6992b61f0d48 100644
--- a/drivers/media/platform/renesas/rcar-vin/rcar-core.c
+++ b/drivers/media/platform/renesas/rcar-vin/rcar-core.c
@@ -1283,7 +1283,7 @@  static const struct rvin_info rcar_info_r8a779a0 = {
 	.max_height = 4096,
 };
 
-static const struct rvin_info rcar_info_r8a779g0 = {
+static const struct rvin_info rcar_info_gen4 = {
 	.model = RCAR_GEN3,
 	.use_mc = true,
 	.use_isp = true,
@@ -1359,7 +1359,11 @@  static const struct of_device_id rvin_of_id_table[] = {
 	},
 	{
 		.compatible = "renesas,vin-r8a779g0",
-		.data = &rcar_info_r8a779g0,
+		.data = &rcar_info_gen4,
+	},
+	{
+		.compatible = "renesas,vin-r8a779h0",
+		.data = &rcar_info_gen4,
 	},
 	{ /* Sentinel */ },
 };