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Subject: media: atomisp: Remove atomisp_try_fmt() call from atomisp_set_fmt()
Author:  Hans de Goede <hdego...@redhat.com>
Date:    Sun Mar 5 18:53:15 2023 +0000

atomisp_set_fmt() first calls:

v4l2_subdev_call(isp->inputs[asd->input_curr].camera,
                 pad, set_fmt, ...);

with v4l2_subdev_format.which set to V4L2_SUBDEV_FORMAT_ACTIVE and then
reduces width + height by padding_w / padding_h followed by calling
atomisp_try_fmt() which then sets res_overflow if the requested resolution
is larger then the sensor's max resolution, but that will never happen
since we are requesting for the result of a set_fmt call minus padding,
so res_overflow will always be false.

And when called with a res_overflow parameter, combined with there
being no overflow then atomisp_try_fmt() does not change the passed
in width/height.

Except when using JPEG or CUSTOM_M10MO_RAW as pixelformat, then
atomisp_try_fmt() does change the width/height but in that case
atomisp_set_fmt actually restores the old widht/height which it
has saved before the atomisp_try_fmt() call. So this too is a no-op.

TL;DR: The atomisp_try_fmt() call in atomisp_set_fmt() is a no-op,
remove it.

Reviewed-by: Andy Shevchenko <andy.shevche...@gmail.com>
Signed-off-by: Hans de Goede <hdego...@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mche...@kernel.org>

 drivers/staging/media/atomisp/pci/atomisp_cmd.c | 56 +++----------------------
 1 file changed, 6 insertions(+), 50 deletions(-)

---

diff --git a/drivers/staging/media/atomisp/pci/atomisp_cmd.c 
b/drivers/staging/media/atomisp/pci/atomisp_cmd.c
index f9a942639703..315971905ee0 100644
--- a/drivers/staging/media/atomisp/pci/atomisp_cmd.c
+++ b/drivers/staging/media/atomisp/pci/atomisp_cmd.c
@@ -4431,7 +4431,7 @@ static void atomisp_get_dis_envelop(struct 
atomisp_sub_device *asd,
 }
 
 static void atomisp_check_copy_mode(struct atomisp_sub_device *asd,
-                                   int source_pad, struct v4l2_pix_format *f)
+                                   int source_pad, const struct 
v4l2_pix_format *f)
 {
        struct v4l2_mbus_framefmt *sink, *src;
 
@@ -4454,8 +4454,7 @@ static void atomisp_check_copy_mode(struct 
atomisp_sub_device *asd,
        dev_dbg(asd->isp->dev, "copy_mode: %d\n", asd->copy_mode);
 }
 
-static int atomisp_set_fmt_to_snr(struct video_device *vdev,
-                                 struct v4l2_pix_format *f, unsigned int 
pixelformat,
+static int atomisp_set_fmt_to_snr(struct video_device *vdev, const struct 
v4l2_pix_format *f,
                                  unsigned int padding_w, unsigned int 
padding_h,
                                  unsigned int dvs_env_w, unsigned int 
dvs_env_h)
 {
@@ -4488,7 +4487,7 @@ static int atomisp_set_fmt_to_snr(struct video_device 
*vdev,
 
        v4l2_fh_init(&fh.vfh, vdev);
 
-       format = atomisp_get_format_bridge(pixelformat);
+       format = atomisp_get_format_bridge(f->pixelformat);
        if (!format)
                return -EINVAL;
 
@@ -4564,8 +4563,6 @@ int atomisp_set_fmt(struct video_device *vdev, struct 
v4l2_format *f)
        const struct atomisp_format_bridge *format_bridge;
        const struct atomisp_format_bridge *snr_format_bridge;
        struct ia_css_frame_info output_info;
-       struct v4l2_pix_format snr_fmt;
-       struct v4l2_pix_format backup_fmt, s_fmt;
        unsigned int dvs_env_w = 0, dvs_env_h = 0;
        unsigned int padding_w = pad_w, padding_h = pad_h;
        struct v4l2_mbus_framefmt isp_source_fmt = {0};
@@ -4574,7 +4571,6 @@ int atomisp_set_fmt(struct video_device *vdev, struct 
v4l2_format *f)
        };
        struct v4l2_rect isp_sink_crop;
        u16 source_pad = atomisp_subdev_source_pad(vdev);
-       bool res_overflow = false;
        struct v4l2_subdev_fh fh;
        int ret;
 
@@ -4623,19 +4619,7 @@ int atomisp_set_fmt(struct video_device *vdev, struct 
v4l2_format *f)
        f->fmt.pix.width = vformat.format.width - padding_w;
        f->fmt.pix.height = vformat.format.height - padding_h;
 
-       snr_fmt = f->fmt.pix;
-       backup_fmt = snr_fmt;
-
-       /* get sensor resolution and format */
-       ret = atomisp_try_fmt(vdev, &snr_fmt, &res_overflow);
-       if (ret) {
-               dev_warn(isp->dev, "Try format failed with error %d\n", ret);
-               return ret;
-       }
-       f->fmt.pix.width = snr_fmt.width;
-       f->fmt.pix.height = snr_fmt.height;
-
-       snr_format_bridge = atomisp_get_format_bridge(snr_fmt.pixelformat);
+       snr_format_bridge = 
atomisp_get_format_bridge_from_mbus(vformat.format.code);
        if (!snr_format_bridge) {
                dev_warn(isp->dev, "Can't find bridge format\n");
                return -EINVAL;
@@ -4656,40 +4640,12 @@ int atomisp_set_fmt(struct video_device *vdev, struct 
v4l2_format *f)
                padding_h = 0;
        }
 
-       /* construct resolution supported by isp */
-       if (res_overflow) {
-               f->fmt.pix.width = rounddown(
-                                      clamp_t(u32, f->fmt.pix.width - 
padding_w,
-                                              ATOM_ISP_MIN_WIDTH,
-                                              ATOM_ISP_MAX_WIDTH), 
ATOM_ISP_STEP_WIDTH);
-               f->fmt.pix.height = rounddown(
-                                       clamp_t(u32, f->fmt.pix.height - 
padding_h,
-                                               ATOM_ISP_MIN_HEIGHT,
-                                               ATOM_ISP_MAX_HEIGHT), 
ATOM_ISP_STEP_HEIGHT);
-       }
-
        atomisp_get_dis_envelop(asd, f->fmt.pix.width, f->fmt.pix.height,
                                &dvs_env_w, &dvs_env_h);
 
        asd->capture_pad = source_pad;
 
-       /*
-        * For jpeg or custom raw format the sensor will return constant
-        * width and height. Because we already had quried try_mbus_fmt,
-        * f->fmt.pix.width and f->fmt.pix.height has been changed to
-        * this fixed width and height. So we cannot select the correct
-        * resolution with that information. So use the original width
-        * and height while set_mbus_fmt() so actual resolutions are
-        * being used in while set media bus format.
-        */
-       s_fmt = f->fmt.pix;
-       if (f->fmt.pix.pixelformat == V4L2_PIX_FMT_JPEG ||
-           f->fmt.pix.pixelformat == V4L2_PIX_FMT_CUSTOM_M10MO_RAW) {
-               s_fmt.width = backup_fmt.width;
-               s_fmt.height = backup_fmt.height;
-       }
-
-       ret = atomisp_set_fmt_to_snr(vdev, &s_fmt, f->fmt.pix.pixelformat,
+       ret = atomisp_set_fmt_to_snr(vdev, &f->fmt.pix,
                                     padding_w, padding_h, dvs_env_w, 
dvs_env_h);
        if (ret) {
                dev_warn(isp->dev,
@@ -4699,7 +4655,7 @@ int atomisp_set_fmt(struct video_device *vdev, struct 
v4l2_format *f)
 
        atomisp_csi_lane_config(isp);
 
-       atomisp_check_copy_mode(asd, source_pad, &backup_fmt);
+       atomisp_check_copy_mode(asd, source_pad, &f->fmt.pix);
 
        isp_sink_crop = *atomisp_subdev_get_rect(&asd->subdev, NULL,
                        V4L2_SUBDEV_FORMAT_ACTIVE,

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