From acc294519f1749041e1b8c74d46bbf6c57d8b061 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Andr=C3=A9=20Apitzsch?= Date: Fri, 20 Dec 2024 14:26:12 +0100 Subject: [PATCH] media: i2c: imx214: Fix link frequency validation MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit The driver defines IMX214_DEFAULT_LINK_FREQ 480000000, and then IMX214_DEFAULT_PIXEL_RATE ((IMX214_DEFAULT_LINK_FREQ * 8LL) / 10), which works out as 384MPix/s. (The 8 is 4 lanes and DDR.) Parsing the PLL registers with the defined 24MHz input. We're in single PLL mode, so MIPI frequency is directly linked to pixel rate. VTCK ends up being 1200MHz, and VTPXCK and OPPXCK both are 120MHz. Section 5.3 "Frame rate calculation formula" says "Pixel rate [pixels/s] = VTPXCK [MHz] * 4", so 120 * 4 = 480MPix/s, which basically agrees with my number above. 3.1.4. MIPI global timing setting says "Output bitrate = OPPXCK * reg 0x113[7:0]", so 120MHz * 10, or 1200Mbit/s. That would be a link frequency of 600MHz due to DDR. That also matches to 480MPix/s * 10bpp / 4 lanes / 2 for DDR. Keep the previous link frequency for backward compatibility. Acked-by: Ricardo Ribalda Signed-off-by: André Apitzsch Fixes: 436190596241 ("media: imx214: Add imx214 camera sensor driver") Cc: stable@vger.kernel.org Signed-off-by: Sakari Ailus Signed-off-by: Hans Verkuil --- drivers/media/i2c/imx214.c | 28 +++++++++++++++++++--------- 1 file changed, 19 insertions(+), 9 deletions(-) diff --git a/drivers/media/i2c/imx214.c b/drivers/media/i2c/imx214.c index 4d7044cd9b7f1..6c3f6f3c8b1f7 100644 --- a/drivers/media/i2c/imx214.c +++ b/drivers/media/i2c/imx214.c @@ -31,7 +31,9 @@ #define IMX214_REG_FAST_STANDBY_CTRL CCI_REG8(0x0106) #define IMX214_DEFAULT_CLK_FREQ 24000000 -#define IMX214_DEFAULT_LINK_FREQ 480000000 +#define IMX214_DEFAULT_LINK_FREQ 600000000 +/* Keep wrong link frequency for backward compatibility */ +#define IMX214_DEFAULT_LINK_FREQ_LEGACY 480000000 #define IMX214_DEFAULT_PIXEL_RATE ((IMX214_DEFAULT_LINK_FREQ * 8LL) / 10) #define IMX214_FPS 30 @@ -1225,18 +1227,26 @@ static int imx214_parse_fwnode(struct device *dev) goto done; } - for (i = 0; i < bus_cfg.nr_of_link_frequencies; i++) + if (bus_cfg.nr_of_link_frequencies != 1) + dev_warn(dev, "Only one link-frequency supported, please review your DT. Continuing anyway\n"); + + for (i = 0; i < bus_cfg.nr_of_link_frequencies; i++) { if (bus_cfg.link_frequencies[i] == IMX214_DEFAULT_LINK_FREQ) break; - - if (i == bus_cfg.nr_of_link_frequencies) { - dev_err_probe(dev, -EINVAL, - "link-frequencies %d not supported, Please review your DT\n", - IMX214_DEFAULT_LINK_FREQ); - ret = -EINVAL; - goto done; + if (bus_cfg.link_frequencies[i] == + IMX214_DEFAULT_LINK_FREQ_LEGACY) { + dev_warn(dev, + "link-frequencies %d not supported, please review your DT. Continuing anyway\n", + IMX214_DEFAULT_LINK_FREQ); + break; + } } + if (i == bus_cfg.nr_of_link_frequencies) + ret = dev_err_probe(dev, -EINVAL, + "link-frequencies %d not supported, please review your DT\n", + IMX214_DEFAULT_LINK_FREQ); + done: v4l2_fwnode_endpoint_free(&bus_cfg); fwnode_handle_put(endpoint); -- 2.50.1