linux-kernel - [PATCH 13/15] media: atomisp: set DFS to MAX if sensor doesn't report fps

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Date:   Wed,  3 Jun 2020 09:00:59 +0200
From:   Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
To:     Linux Media Mailing List <linux-media@...r.kernel.org>
Cc:     Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: [PATCH 13/15] media: atomisp: set DFS to MAX if sensor doesn't report fps

If the sensor doesn't implement support for g_frame_interval,
it won't return the expected fps rate.

Instead of keeping DFS on its minimal value (which will likely
not work), set it to the max.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
---
 drivers/staging/media/atomisp/pci/atomisp_cmd.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/media/atomisp/pci/atomisp_cmd.c b/drivers/staging/media/atomisp/pci/atomisp_cmd.c
index 6c324815c0f6..845fa851029a 100644
--- a/drivers/staging/media/atomisp/pci/atomisp_cmd.c
+++ b/drivers/staging/media/atomisp/pci/atomisp_cmd.c
@@ -243,8 +243,12 @@ int atomisp_freq_scaling(struct atomisp_device *isp,
 	}
 
 	fps = atomisp_get_sensor_fps(asd);
-	if (fps == 0)
-		return -EINVAL;
+	if (fps == 0) {
+		dev_info(isp->dev,
+			 "Sensor didn't report FPS. Using DFS max mode.\n");
+		new_freq = dfs->highest_freq;
+		goto done;
+	}
 
 	curr_rules.width = asd->fmt[asd->capture_pad].fmt.width;
 	curr_rules.height = asd->fmt[asd->capture_pad].fmt.height;
-- 
2.26.2