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[2/3] media: rcar-csi2: Add warning for PHY speed less than minimum

Message ID 20210813150756.131826-3-niklas.soderlund+renesas@ragnatech.se (mailing list archive)
State Accepted
Delegated to: Kieran Bingham
Headers show
Series rcar-csi2: Improve link frequency selection | expand

Commit Message

Niklas Söderlund Aug. 13, 2021, 3:07 p.m. UTC 
From: Suresh Udipi <sudipi@jp.adit-jv.com>

Add a warning message when the selected PHY speed is less
than supported minimum PHY speed given in the hsfreq table[1].

For raspberry pi camera capture on Kingfisher board with resolution
640x480, the calculated PHY speed is 48 mbps which is less than
the minimum PHY speed 80 Mbps from the table[1]. But in this cases
capture is successful.

[1] specs r19uh0105ej0200-r-car-3rd-generation.pdf [Table 25.9]

Signed-off-by: Suresh Udipi <sudipi@jp.adit-jv.com>
Signed-off-by: Michael Rodin <mrodin@de.adit-jv.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
---
 drivers/media/platform/rcar-vin/rcar-csi2.c | 4 ++++
 1 file changed, 4 insertions(+)
diff mbox series

Patch

diff --git a/drivers/media/platform/rcar-vin/rcar-csi2.c b/drivers/media/platform/rcar-vin/rcar-csi2.c
index d042967335edbd6a..5b531e0bb5a08f9c 100644
--- a/drivers/media/platform/rcar-vin/rcar-csi2.c
+++ b/drivers/media/platform/rcar-vin/rcar-csi2.c
@@ -545,6 +545,10 @@  static int rcsi2_set_phypll(struct rcar_csi2 *priv, unsigned int mbps)
 	const struct rcsi2_mbps_reg *hsfreq;
 	const struct rcsi2_mbps_reg *hsfreq_prev = NULL;
 
+	if (mbps < priv->info->hsfreqrange->mbps)
+		dev_warn(priv->dev, "%u Mbps less than min PHY speed %u Mbps",
+			 mbps, priv->info->hsfreqrange->mbps);
+
 	for (hsfreq = priv->info->hsfreqrange; hsfreq->mbps != 0; hsfreq++) {
 		if (hsfreq->mbps >= mbps)
 			break;