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media: imx: imx7_mipi_csis: Calculate Ths_settle from source lane rate

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The Ths_settle timing parameter depends solely on the lane data rate of
the source. Calculate it at runtime instead of requiring it to be
specified in the device tree.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
This commit is contained in:
Laurent Pinchart 2021-03-01 17:40:19 +01:00 committed by Mauro Carvalho Chehab
parent bef63005e3
commit 74f815840e
1 changed files with 41 additions and 7 deletions
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48
drivers/staging/media/imx/imx7-mipi-csis.c
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@ -24,6 +24,7 @@
#include <linux/reset.h>
#include <linux/spinlock.h>
#include <media/v4l2-common.h>
#include <media/v4l2-device.h>
#include <media/v4l2-fwnode.h>
#include <media/v4l2-mc.h>
@ -482,6 +483,39 @@ static void __mipi_csis_set_format(struct csi_state *state)
mipi_csis_write(state, MIPI_CSIS_ISPRESOL_CH0, val);
}
static int mipi_csis_calculate_params(struct csi_state *state)
{
s64 link_freq;
u32 lane_rate;
/* Calculate the line rate from the pixel rate. */
link_freq = v4l2_get_link_freq(state->src_sd->ctrl_handler,
state->csis_fmt->width,
state->bus.num_data_lanes * 2);
if (link_freq < 0) {
dev_err(state->dev, "Unable to obtain link frequency: %d\n",
(int)link_freq);
return link_freq;
}
lane_rate = link_freq * 2;
if (lane_rate < 80000000 || lane_rate > 1500000000) {
dev_dbg(state->dev, "Out-of-bound lane rate %u\n", lane_rate);
return -EINVAL;
}
/*
* The HSSETTLE counter value is document in a table, but can also
* easily be calculated.
*/
state->hs_settle = (lane_rate - 5000000) / 45000000;
dev_dbg(state->dev, "lane rate %u, Ths_settle %u\n",
lane_rate, state->hs_settle);
return 0;
}
static void mipi_csis_set_params(struct csi_state *state)
{
int lanes = state->bus.num_data_lanes;
@ -608,9 +642,13 @@ static void mipi_csis_log_counters(struct csi_state *state, bool non_errors)
static int mipi_csis_s_stream(struct v4l2_subdev *mipi_sd, int enable)
{
struct csi_state *state = mipi_sd_to_csis_state(mipi_sd);
int ret = 0;
int ret;
if (enable) {
ret = mipi_csis_calculate_params(state);
if (ret < 0)
return ret;
mipi_csis_clear_counters(state);
ret = pm_runtime_get_sync(&state->pdev->dev);
if (ret < 0) {
@ -943,9 +981,6 @@ static int mipi_csis_parse_dt(struct platform_device *pdev,
if (IS_ERR(state->mrst))
return PTR_ERR(state->mrst);
/* Get MIPI CSI-2 bus configuration from the endpoint node. */
of_property_read_u32(node, "fsl,csis-hs-settle", &state->hs_settle);
return 0;
}
@ -1143,9 +1178,8 @@ static int mipi_csis_probe(struct platform_device *pdev)
goto unregister_all;
}
dev_info(&pdev->dev, "lanes: %d, hs_settle: %d, freq: %u\n",
state->bus.num_data_lanes, state->hs_settle,
state->clk_frequency);
dev_info(&pdev->dev, "lanes: %d, freq: %u\n",
state->bus.num_data_lanes, state->clk_frequency);
return 0;