2022-04-22 15:00:47 +00:00
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From 42d31aa3af358f376e5a97fbb72d529f2e5e4a91 Mon Sep 17 00:00:00 2001
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2021-11-24 17:32:01 +00:00
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From: Dave Stevenson <dave.stevenson@raspberrypi.com>
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Date: Thu, 17 Jun 2021 13:00:39 +0100
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2022-04-22 15:00:47 +00:00
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Subject: [PATCH 416/828] media: i2c: imx290: Fix the pixel rate at 148.5Mpix/s
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2021-11-24 17:32:01 +00:00
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Whilst the datasheet lists the link frequency changing between
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1080p and 720p modes, reality is that with the default blanking
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we have
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(1920 + 280) * (1080 + 45) * 60fps = 148.5MPix/s
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and
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(1280 + 2020) * (720 + 30) * 60fps = 148.5MPix/s
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and this reflects reality whether in 10 or 12 bit readout modes.
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How this relates to link frequency is unclear as it differs
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from the datasheet, but all exposure and frame rate calcs need
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the pixel rate to be correct, so make it so.
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Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
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---
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drivers/media/i2c/imx290.c | 16 +---------------
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1 file changed, 1 insertion(+), 15 deletions(-)
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--- a/drivers/media/i2c/imx290.c
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+++ b/drivers/media/i2c/imx290.c
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2022-04-22 15:00:47 +00:00
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@@ -853,23 +853,9 @@ static inline u8 imx290_get_link_freq_in
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2021-11-24 17:32:01 +00:00
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return imx290->current_mode->link_freq_index;
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}
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-static s64 imx290_get_link_freq(struct imx290 *imx290)
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-{
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- u8 index = imx290_get_link_freq_index(imx290);
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-
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- return *(imx290_link_freqs_ptr(imx290) + index);
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-}
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-
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static u64 imx290_calc_pixel_rate(struct imx290 *imx290)
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{
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- s64 link_freq = imx290_get_link_freq(imx290);
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- u8 nlanes = imx290->nlanes;
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- u64 pixel_rate;
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-
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- /* pixel rate = link_freq * 2 * nr_of_lanes / bits_per_sample */
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- pixel_rate = link_freq * 2 * nlanes;
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- do_div(pixel_rate, imx290->bpp);
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- return pixel_rate;
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+ return 148500000;
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}
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static int imx290_set_fmt(struct v4l2_subdev *sd,
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