linux-kernel - [PATCH] staging: media: ipu3: Fix AWB x_start position when rightmost stripe is used

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Date:   Thu,  7 Apr 2022 14:42:41 +0800
From:   Kate Hsuan <hpa@...hat.com>
To:     Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Bingbu Cao <bingbu.cao@...el.com>,
        Tianshu Qiu <tian.shu.qiu@...el.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Jean-Michel Hautbois <jeanmichel.hautbois@...asonboard.com>,
        linux-media@...r.kernel.org, linux-staging@...ts.linux.dev,
        linux-kernel@...r.kernel.org, hdegoede@...hat.com,
        Kate Hsuan <hpa@...hat.com>
Subject: [PATCH] staging: media: ipu3: Fix AWB x_start position when rightmost stripe is used

A not calibrated x_start setting would result in an incorrect AWB location
configuration on a sensor when only the rightmost stripe is used. x_start
should be calibrated by subtracting the stripe offset to set the coordinate
to the correct position on the second stripe.

Signed-off-by: Kate Hsuan <hpa@...hat.com>
---
 drivers/staging/media/ipu3/ipu3-css-params.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/staging/media/ipu3/ipu3-css-params.c b/drivers/staging/media/ipu3/ipu3-css-params.c
index f84cf11358a8..050d7df7e72a 100644
--- a/drivers/staging/media/ipu3/ipu3-css-params.c
+++ b/drivers/staging/media/ipu3/ipu3-css-params.c
@@ -2393,6 +2393,15 @@ int imgu_css_cfg_acc(struct imgu_css *css, unsigned int pipe,
 		/* Enable only for rightmost stripe, disable left */
 		acc->awb_fr.stripes[0].grid_cfg.y_start &=
 					~IPU3_UAPI_GRID_Y_START_EN;
+		acc->awb_fr.stripes[1].grid_cfg.x_start =
+			(acc->awb_fr.stripes[1].grid_cfg.x_start -
+			 acc->stripe.down_scaled_stripes[1].offset) &
+			IPU3_UAPI_GRID_START_MASK;
+		b_w_log2 = acc->awb_fr.stripes[1].grid_cfg.block_width_log2;
+		acc->awb_fr.stripes[1].grid_cfg.x_end  =
+					imgu_css_grid_end(acc->awb_fr.stripes[1].grid_cfg.x_start,
+							  acc->awb_fr.stripes[1].grid_cfg.width,
+							  b_w_log2);
 	} else if (acc->awb_fr.config.grid_cfg.x_end <=
 		   acc->stripe.bds_out_stripes[0].width - min_overlap) {
 		/* Enable only for leftmost stripe, disable right */
-- 
2.35.1