Instead of reinventing the wheel, use v4l2_find_nearest_size()
in order to get the closest resolution.
This should address a bug where the wrong resolution was
selected.
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@xxxxxxxxxx>
---
.../media/atomisp/i2c/atomisp-mt9m114.c | 130 ++----------------
1 file changed, 15 insertions(+), 115 deletions(-)
diff --git a/drivers/staging/media/atomisp/i2c/atomisp-mt9m114.c b/drivers/staging/media/atomisp/i2c/atomisp-mt9m114.c
index 49f4090856d3..00d6842c07d6 100644
--- a/drivers/staging/media/atomisp/i2c/atomisp-mt9m114.c
+++ b/drivers/staging/media/atomisp/i2c/atomisp-mt9m114.c
@@ -579,107 +579,6 @@ static int mt9m114_s_power(struct v4l2_subdev *sd, int power)
return mt9m114_init_common(sd);
}
-/*
- * distance - calculate the distance
- * @res: resolution
- * @w: width
- * @h: height
- *
- * Get the gap between resolution and w/h.
- * res->width/height smaller than w/h wouldn't be considered.
- * Returns the value of gap or -1 if fail.
- */
-#define LARGEST_ALLOWED_RATIO_MISMATCH 600
-static int distance(struct mt9m114_res_struct const *res, u32 w, u32 h)
-{
- unsigned int w_ratio;
- unsigned int h_ratio;
- int match;
-
- if (w == 0)
- return -1;
- w_ratio = (res->width << 13) / w;
- if (h == 0)
- return -1;
- h_ratio = (res->height << 13) / h;
- if (h_ratio == 0)
- return -1;
- match = abs(((w_ratio << 13) / h_ratio) - 8192);
-
- if ((w_ratio < 8192) || (h_ratio < 8192) ||
- (match > LARGEST_ALLOWED_RATIO_MISMATCH))
- return -1;
-
- return w_ratio + h_ratio;
-}
-
-/* Return the nearest higher resolution index */
-static int nearest_resolution_index(int w, int h)
-{
- int i;
- int idx = -1;
- int dist;
- int min_dist = INT_MAX;
- const struct mt9m114_res_struct *tmp_res = NULL;
-
- for (i = 0; i < ARRAY_SIZE(mt9m114_res); i++) {
- tmp_res = &mt9m114_res[i];
- dist = distance(tmp_res, w, h);
- if (dist == -1)
- continue;
- if (dist < min_dist) {
- min_dist = dist;
- idx = i;
- }
- }
-
- return idx;
-}
-
-static int mt9m114_try_res(u32 *w, u32 *h)
-{
- int idx = 0;
-
- if ((*w > MT9M114_RES_960P_SIZE_H)
- || (*h > MT9M114_RES_960P_SIZE_V)) {
- *w = MT9M114_RES_960P_SIZE_H;
- *h = MT9M114_RES_960P_SIZE_V;
- } else {
- idx = nearest_resolution_index(*w, *h);
-
- /*
- * nearest_resolution_index() doesn't return smaller
- * resolutions. If it fails, it means the requested
- * resolution is higher than wecan support. Fallback
- * to highest possible resolution in this case.
- */
- if (idx == -1)
- idx = ARRAY_SIZE(mt9m114_res) - 1;
-
- *w = mt9m114_res[idx].width;
- *h = mt9m114_res[idx].height;
- }
-
- return 0;
-}
-
-static struct mt9m114_res_struct *mt9m114_to_res(u32 w, u32 h)
-{
- int index;
-
- for (index = 0; index < N_RES; index++) {
- if ((mt9m114_res[index].width == w) &&
- (mt9m114_res[index].height == h))
- break;
- }
-
- /* No mode found */
- if (index >= N_RES)
- return NULL;
-
- return &mt9m114_res[index];
-}
-
static int mt9m114_res2size(struct v4l2_subdev *sd, int *h_size, int *v_size)
{
struct mt9m114_device *dev = to_mt9m114_sensor(sd);
@@ -829,7 +728,7 @@ static int mt9m114_set_fmt(struct v4l2_subdev *sd,
struct v4l2_mbus_framefmt *fmt = &format->format;
struct i2c_client *c = v4l2_get_subdevdata(sd);
struct mt9m114_device *dev = to_mt9m114_sensor(sd);
- struct mt9m114_res_struct *res_index;
+ struct mt9m114_res_struct *res;
u32 width = fmt->width;
u32 height = fmt->height;
struct camera_mipi_info *mt9m114_info = NULL;
@@ -845,20 +744,21 @@ static int mt9m114_set_fmt(struct v4l2_subdev *sd,
if (!mt9m114_info)
return -EINVAL;
- mt9m114_try_res(&width, &height);
+ res = v4l2_find_nearest_size(mt9m114_res,
+ ARRAY_SIZE(mt9m114_res), width,
+ height, fmt->width, fmt->height);
+ if (!res)
+ res = &mt9m114_res[N_RES - 1];
+
+ fmt->width = res->width;
+ fmt->height = res->height;
+
if (format->which == V4L2_SUBDEV_FORMAT_TRY) {
sd_state->pads->try_fmt = *fmt;
return 0;
}
- res_index = mt9m114_to_res(width, height);
- /* Sanity check */
- if (unlikely(!res_index)) {
- WARN_ON(1);
- return -EINVAL;
- }
-
- switch (res_index->res) {
+ switch (res->res) {
case MT9M114_RES_736P:
ret = mt9m114_write_reg_array(c, mt9m114_736P_init, NO_POLLING);
ret += misensor_rmw_reg(c, MISENSOR_16BIT, MISENSOR_READ_MODE,
@@ -876,7 +776,7 @@ static int mt9m114_set_fmt(struct v4l2_subdev *sd,
MISENSOR_R_MODE_MASK, MISENSOR_NORMAL_SET);
break;
default:
- v4l2_err(sd, "set resolution: %d failed!\n", res_index->res);
+ v4l2_err(sd, "set resolution: %d failed!\n", res->res);
return -EINVAL;
}
@@ -890,7 +790,7 @@ static int mt9m114_set_fmt(struct v4l2_subdev *sd,
if (mt9m114_set_suspend(sd))
return -EINVAL;
- if (dev->res != res_index->res) {
+ if (dev->res != res->res) {
int index;
/* Switch to different size */
@@ -922,7 +822,7 @@ static int mt9m114_set_fmt(struct v4l2_subdev *sd,
}
}
ret = mt9m114_get_intg_factor(c, mt9m114_info,
- &mt9m114_res[res_index->res]);
+ &mt9m114_res[res->res]);
if (ret) {
dev_err(&c->dev, "failed to get integration_factor\n");
return -EINVAL;
@@ -931,7 +831,7 @@ static int mt9m114_set_fmt(struct v4l2_subdev *sd,
* mt9m114 - we don't poll for context switch
* because it does not happen with streaming disabled.
*/
- dev->res = res_index->res;
+ dev->res = res->res;
fmt->width = width;
fmt->height = height;
--
2.31.1
