From: Hans de Goede <hansg@kernel.org>
To: Sakari Ailus <sakari.ailus@linux.intel.com>,
Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: Hans de Goede <hansg@kernel.org>,
Mathis Foerst <mathis.foerst@mt.com>,
linux-media@vger.kernel.org
Subject: [PATCH v3 06/15] media: mt9m114: Tweak default hblank and vblank for more accurate fps
Date: Sun, 29 Jun 2025 22:56:16 +0200 [thread overview]
Message-ID: <20250629205626.68341-7-hansg@kernel.org> (raw)
In-Reply-To: <20250629205626.68341-1-hansg@kernel.org>
The PLL gets programmed to achieve a 48 MHz pixelclock, with the current
vblank + hblank defaults this results in a fps of:
48000000 / ((1296 + 307) * (976 + 23) = 29.974 fps
Tweak the defaults to get closer to 30 fps:
48000000 / ((1296 + 308) * (976 + 21) = 30.015 fps
This improves things from being 0.026 fps too low to 0.015 fps too high.
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Hans de Goede <hansg@kernel.org>
---
drivers/media/i2c/mt9m114.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/media/i2c/mt9m114.c b/drivers/media/i2c/mt9m114.c
index 10ddcc102b8a..06f835b08f8e 100644
--- a/drivers/media/i2c/mt9m114.c
+++ b/drivers/media/i2c/mt9m114.c
@@ -333,8 +333,8 @@
*/
#define MT9M114_MIN_HBLANK 303
#define MT9M114_MIN_VBLANK 21
-#define MT9M114_DEF_HBLANK 307
-#define MT9M114_DEF_VBLANK 23
+#define MT9M114_DEF_HBLANK 308
+#define MT9M114_DEF_VBLANK 21
#define MT9M114_DEF_FRAME_RATE 30
#define MT9M114_MAX_FRAME_RATE 120
--
2.49.0
next prev parent reply other threads:[~2025-06-29 20:56 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-06-29 20:56 [PATCH v3 00/15] media: mt9m114: Changes to make it work with atomisp devices Hans de Goede
2025-06-29 20:56 ` [PATCH v3 01/15] media: aptina-pll: Debug log p1 min and max values Hans de Goede
2025-06-29 20:56 ` [PATCH v3 02/15] media: mt9m114: Add support for clock-frequency property Hans de Goede
2025-06-29 20:56 ` [PATCH v3 03/15] media: mt9m114: Use aptina-PLL helper to get PLL values Hans de Goede
2025-06-29 20:56 ` [PATCH v3 04/15] media: mt9m114: Lower minimum vblank value Hans de Goede
2025-06-29 20:56 ` [PATCH v3 05/15] media: mt9m114: Fix default hblank and vblank values Hans de Goede
2025-06-29 20:56 ` Hans de Goede [this message]
2025-06-29 20:56 ` [PATCH v3 07/15] media: mt9m114: Avoid a reset low spike during probe() Hans de Goede
2025-06-29 20:56 ` [PATCH v3 08/15] media: mt9m114: Put sensor in reset on power down Hans de Goede
2025-06-29 20:56 ` [PATCH v3 09/15] media: mt9m114: Add and use mt9m114_ifp_get_border() helper function Hans de Goede
2025-07-02 0:17 ` Laurent Pinchart
2025-06-29 20:56 ` [PATCH v3 10/15] media: mt9m114: Adjust IFP selections and src format when src pixelfmt changes to/from RAW10 Hans de Goede
2025-07-02 0:32 ` Laurent Pinchart
2025-12-23 13:33 ` Hans de Goede
2025-06-29 20:56 ` [PATCH v3 11/15] media: mt9m114: Update src pad sel and format when sink pad format changes Hans de Goede
2025-07-02 0:36 ` Laurent Pinchart
2025-06-29 20:56 ` [PATCH v3 12/15] media: mt9m114: Don't allow changing the IFP crop/compose selections when bypassing the scaler Hans de Goede
2025-07-02 0:42 ` Laurent Pinchart
2025-06-29 20:56 ` [PATCH v3 13/15] media: mt9m114: Drop start-, stop-streaming sequence from initialize Hans de Goede
2025-07-02 1:08 ` Laurent Pinchart
2025-12-23 13:37 ` Hans de Goede
2025-12-23 16:50 ` Laurent Pinchart
2025-12-23 16:57 ` Hans de Goede
2025-06-29 20:56 ` [PATCH v3 14/15] media: mt9m114: Return -EPROBE_DEFER if no endpoint is found Hans de Goede
2025-07-02 0:53 ` Laurent Pinchart
2025-12-24 12:12 ` Hans de Goede
2025-12-27 14:54 ` Laurent Pinchart
2025-06-29 20:56 ` [PATCH v3 15/15] media: mt9m114: Add ACPI enumeration support Hans de Goede
[not found] ` <6861b00f.050a0220.379e4a.5185@mx.google.com>
2025-06-30 7:34 ` [v3,00/15] media: mt9m114: Changes to make it work with atomisp devices Hans de Goede
2025-06-30 22:28 ` [PATCH v3 00/15] " Laurent Pinchart
2025-07-01 13:21 ` Hans de Goede
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