[media] mt9m111: properly implement .s_crop and .s_fmt(), reset on STREAMON

mt9m111 camera sensors support cropping and scaling. The current
implementation is broken. For example, .s_crop() sets output frame sizes
instead of the input cropping window. This patch adds a proper implementation
of these methods. Besides it adds a sensor-disable and -enable operations
on first open() and last close() respectively, to save power while closed and
to return the camera to the default power-on state.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --git a/drivers/media/video/mt9m111.c b/drivers/media/video/mt9m111.c
index 1405005..bee65bf 100644 (file)
--- a/drivers/media/video/mt9m111.c
+++ b/drivers/media/video/mt9m111.c
@@ -185,19 +185,6 @@ struct mt9m111_datafmt {
        enum v4l2_colorspace            colorspace;
 };
 
-/* Find a data format by a pixel code in an array */
-static const struct mt9m111_datafmt *mt9m111_find_datafmt(
-       enum v4l2_mbus_pixelcode code, const struct mt9m111_datafmt *fmt,
-       int n)
-{
-       int i;
-       for (i = 0; i < n; i++)
-               if (fmt[i].code == code)
-                       return fmt + i;
-
-       return NULL;
-}
-
 static const struct mt9m111_datafmt mt9m111_colour_fmts[] = {
        {V4L2_MBUS_FMT_YUYV8_2X8, V4L2_COLORSPACE_JPEG},
        {V4L2_MBUS_FMT_YVYU8_2X8, V4L2_COLORSPACE_JPEG},
@@ -220,7 +207,9 @@ struct mt9m111 {
        int model;      /* V4L2_IDENT_MT9M111 or V4L2_IDENT_MT9M112 code
                         * from v4l2-chip-ident.h */
        struct mt9m111_context *ctx;
-       struct v4l2_rect rect;
+       struct v4l2_rect rect;  /* cropping rectangle */
+       int width;              /* output */
+       int height;             /* sizes */
        struct mutex power_lock; /* lock to protect power_count */
        int power_count;
        const struct mt9m111_datafmt *fmt;
@@ -228,6 +217,18 @@ struct mt9m111 {
        unsigned char datawidth;
 };
 
+/* Find a data format by a pixel code */
+static const struct mt9m111_datafmt *mt9m111_find_datafmt(struct mt9m111 *mt9m111,
+                                               enum v4l2_mbus_pixelcode code)
+{
+       int i;
+       for (i = 0; i < ARRAY_SIZE(mt9m111_colour_fmts); i++)
+               if (mt9m111_colour_fmts[i].code == code)
+                       return mt9m111_colour_fmts + i;
+
+       return mt9m111->fmt;
+}
+
 static struct mt9m111 *to_mt9m111(const struct i2c_client *client)
 {
        return container_of(i2c_get_clientdata(client), struct mt9m111, subdev);
@@ -316,43 +317,49 @@ static int mt9m111_set_context(struct mt9m111 *mt9m111,
 }
 
 static int mt9m111_setup_rect_ctx(struct mt9m111 *mt9m111,
-                       struct v4l2_rect *rect, struct mt9m111_context *ctx)
+                       struct mt9m111_context *ctx, struct v4l2_rect *rect,
+                       unsigned int width, unsigned int height)
 {
        struct i2c_client *client = v4l2_get_subdevdata(&mt9m111->subdev);
-       int ret = mt9m111_reg_write(client, ctx->reducer_xzoom, MT9M111_MAX_WIDTH);
+       int ret = mt9m111_reg_write(client, ctx->reducer_xzoom, rect->width);
        if (!ret)
-               ret = mt9m111_reg_write(client, ctx->reducer_yzoom, MT9M111_MAX_HEIGHT);
+               ret = mt9m111_reg_write(client, ctx->reducer_yzoom, rect->height);
        if (!ret)
-               ret = mt9m111_reg_write(client, ctx->reducer_xsize, rect->width);
+               ret = mt9m111_reg_write(client, ctx->reducer_xsize, width);
        if (!ret)
-               ret = mt9m111_reg_write(client, ctx->reducer_ysize, rect->height);
+               ret = mt9m111_reg_write(client, ctx->reducer_ysize, height);
        return ret;
 }
 
-static int mt9m111_setup_rect(struct mt9m111 *mt9m111,
-                             struct v4l2_rect *rect)
+static int mt9m111_setup_geometry(struct mt9m111 *mt9m111, struct v4l2_rect *rect,
+                       int width, int height, enum v4l2_mbus_pixelcode code)
 {
        struct i2c_client *client = v4l2_get_subdevdata(&mt9m111->subdev);
        int ret;
-       bool is_raw_format = mt9m111->fmt->code == V4L2_MBUS_FMT_SBGGR8_1X8 ||
-               mt9m111->fmt->code == V4L2_MBUS_FMT_SBGGR10_2X8_PADHI_LE;
 
        ret = reg_write(COLUMN_START, rect->left);
        if (!ret)
                ret = reg_write(ROW_START, rect->top);
 
-       if (is_raw_format) {
-               if (!ret)
-                       ret = reg_write(WINDOW_WIDTH, rect->width);
-               if (!ret)
-                       ret = reg_write(WINDOW_HEIGHT, rect->height);
-       } else {
+       if (!ret)
+               ret = reg_write(WINDOW_WIDTH, rect->width);
+       if (!ret)
+               ret = reg_write(WINDOW_HEIGHT, rect->height);
+
+       if (code != V4L2_MBUS_FMT_SBGGR10_2X8_PADHI_LE) {
+               /* IFP in use, down-scaling possible */
                if (!ret)
-                       ret = mt9m111_setup_rect_ctx(mt9m111, rect, &context_b);
+                       ret = mt9m111_setup_rect_ctx(mt9m111, &context_b,
+                                                    rect, width, height);
                if (!ret)
-                       ret = mt9m111_setup_rect_ctx(mt9m111, rect, &context_a);
+                       ret = mt9m111_setup_rect_ctx(mt9m111, &context_a,
+                                                    rect, width, height);
        }
 
+       dev_dbg(&client->dev, "%s(%x): %ux%u@%u:%u -> %ux%u = %d\n",
+               __func__, code, rect->width, rect->height, rect->left, rect->top,
+               width, height, ret);
+
        return ret;
 }
 
@@ -377,43 +384,41 @@ static int mt9m111_reset(struct mt9m111 *mt9m111)
        return ret;
 }
 
-static int mt9m111_make_rect(struct mt9m111 *mt9m111,
-                            struct v4l2_rect *rect)
+static int mt9m111_s_crop(struct v4l2_subdev *sd, struct v4l2_crop *a)
 {
+       struct v4l2_rect rect = a->c;
+       struct mt9m111 *mt9m111 = container_of(sd, struct mt9m111, subdev);
+       int width, height;
+       int ret;
+
+       if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+               return -EINVAL;
+
        if (mt9m111->fmt->code == V4L2_MBUS_FMT_SBGGR8_1X8 ||
            mt9m111->fmt->code == V4L2_MBUS_FMT_SBGGR10_2X8_PADHI_LE) {
                /* Bayer format - even size lengths */
-               rect->width     = ALIGN(rect->width, 2);
-               rect->height    = ALIGN(rect->height, 2);
+               rect.width      = ALIGN(rect.width, 2);
+               rect.height     = ALIGN(rect.height, 2);
                /* Let the user play with the starting pixel */
        }
 
        /* FIXME: the datasheet doesn't specify minimum sizes */
-       soc_camera_limit_side(&rect->left, &rect->width,
+       soc_camera_limit_side(&rect.left, &rect.width,
                     MT9M111_MIN_DARK_COLS, 2, MT9M111_MAX_WIDTH);
 
-       soc_camera_limit_side(&rect->top, &rect->height,
+       soc_camera_limit_side(&rect.top, &rect.height,
                     MT9M111_MIN_DARK_ROWS, 2, MT9M111_MAX_HEIGHT);
 
-       return mt9m111_setup_rect(mt9m111, rect);
-}
-
-static int mt9m111_s_crop(struct v4l2_subdev *sd, struct v4l2_crop *a)
-{
-       struct v4l2_rect rect = a->c;
-       struct i2c_client *client = v4l2_get_subdevdata(sd);
-       struct mt9m111 *mt9m111 = container_of(sd, struct mt9m111, subdev);
-       int ret;
+       width = min(mt9m111->width, rect.width);
+       height = min(mt9m111->height, rect.height);
 
-       dev_dbg(&client->dev, "%s left=%d, top=%d, width=%d, height=%d\n",
-               __func__, rect.left, rect.top, rect.width, rect.height);
-
-       if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
-               return -EINVAL;
-
-       ret = mt9m111_make_rect(mt9m111, &rect);
-       if (!ret)
+       ret = mt9m111_setup_geometry(mt9m111, &rect, width, height, mt9m111->fmt->code);
+       if (!ret) {
                mt9m111->rect = rect;
+               mt9m111->width = width;
+               mt9m111->height = height;
+       }
+
        return ret;
 }
 
@@ -448,8 +453,8 @@ static int mt9m111_g_fmt(struct v4l2_subdev *sd,
 {
        struct mt9m111 *mt9m111 = container_of(sd, struct mt9m111, subdev);
 
-       mf->width       = mt9m111->rect.width;
-       mf->height      = mt9m111->rect.height;
+       mf->width       = mt9m111->width;
+       mf->height      = mt9m111->height;
        mf->code        = mt9m111->fmt->code;
        mf->colorspace  = mt9m111->fmt->colorspace;
        mf->field       = V4L2_FIELD_NONE;
@@ -527,80 +532,74 @@ static int mt9m111_set_pixfmt(struct mt9m111 *mt9m111,
        return ret;
 }
 
-static int mt9m111_s_fmt(struct v4l2_subdev *sd,
-                        struct v4l2_mbus_framefmt *mf)
-{
-       struct i2c_client *client = v4l2_get_subdevdata(sd);
-       const struct mt9m111_datafmt *fmt;
-       struct mt9m111 *mt9m111 = container_of(sd, struct mt9m111, subdev);
-       struct v4l2_rect rect = {
-               .left   = mt9m111->rect.left,
-               .top    = mt9m111->rect.top,
-               .width  = mf->width,
-               .height = mf->height,
-       };
-       int ret;
-
-       fmt = mt9m111_find_datafmt(mf->code, mt9m111_colour_fmts,
-                                  ARRAY_SIZE(mt9m111_colour_fmts));
-       if (!fmt)
-               return -EINVAL;
-
-       dev_dbg(&client->dev,
-               "%s code=%x left=%d, top=%d, width=%d, height=%d\n", __func__,
-               mf->code, rect.left, rect.top, rect.width, rect.height);
-
-       ret = mt9m111_make_rect(mt9m111, &rect);
-       if (!ret)
-               ret = mt9m111_set_pixfmt(mt9m111, mf->code);
-       if (!ret) {
-               mt9m111->rect   = rect;
-               mt9m111->fmt    = fmt;
-               mf->colorspace  = fmt->colorspace;
-       }
-
-       return ret;
-}
-
 static int mt9m111_try_fmt(struct v4l2_subdev *sd,
                           struct v4l2_mbus_framefmt *mf)
 {
+       struct i2c_client *client = v4l2_get_subdevdata(sd);
        struct mt9m111 *mt9m111 = container_of(sd, struct mt9m111, subdev);
        const struct mt9m111_datafmt *fmt;
-       bool bayer = mf->code == V4L2_MBUS_FMT_SBGGR8_1X8 ||
-               mf->code == V4L2_MBUS_FMT_SBGGR10_2X8_PADHI_LE;
-
-       fmt = mt9m111_find_datafmt(mf->code, mt9m111_colour_fmts,
-                                  ARRAY_SIZE(mt9m111_colour_fmts));
-       if (!fmt) {
-               fmt = mt9m111->fmt;
-               mf->code = fmt->code;
-       }
+       struct v4l2_rect *rect = &mt9m111->rect;
+       bool bayer;
+
+       fmt = mt9m111_find_datafmt(mt9m111, mf->code);
+
+       bayer = fmt->code == V4L2_MBUS_FMT_SBGGR8_1X8 ||
+               fmt->code == V4L2_MBUS_FMT_SBGGR10_2X8_PADHI_LE;
 
        /*
         * With Bayer format enforce even side lengths, but let the user play
         * with the starting pixel
         */
+       if (bayer) {
+               rect->width = ALIGN(rect->width, 2);
+               rect->height = ALIGN(rect->height, 2);
+       }
 
-       if (mf->height > MT9M111_MAX_HEIGHT)
-               mf->height = MT9M111_MAX_HEIGHT;
-       else if (mf->height < 2)
-               mf->height = 2;
-       else if (bayer)
-               mf->height = ALIGN(mf->height, 2);
+       if (fmt->code == V4L2_MBUS_FMT_SBGGR10_2X8_PADHI_LE) {
+               /* IFP bypass mode, no scaling */
+               mf->width = rect->width;
+               mf->height = rect->height;
+       } else {
+               /* No upscaling */
+               if (mf->width > rect->width)
+                       mf->width = rect->width;
+               if (mf->height > rect->height)
+                       mf->height = rect->height;
+       }
 
-       if (mf->width > MT9M111_MAX_WIDTH)
-               mf->width = MT9M111_MAX_WIDTH;
-       else if (mf->width < 2)
-               mf->width = 2;
-       else if (bayer)
-               mf->width = ALIGN(mf->width, 2);
+       dev_dbg(&client->dev, "%s(): %ux%u, code=%x\n", __func__,
+               mf->width, mf->height, fmt->code);
 
+       mf->code = fmt->code;
        mf->colorspace = fmt->colorspace;
 
        return 0;
 }
 
+static int mt9m111_s_fmt(struct v4l2_subdev *sd,
+                        struct v4l2_mbus_framefmt *mf)
+{
+       const struct mt9m111_datafmt *fmt;
+       struct mt9m111 *mt9m111 = container_of(sd, struct mt9m111, subdev);
+       struct v4l2_rect *rect = &mt9m111->rect;
+       int ret;
+
+       mt9m111_try_fmt(sd, mf);
+       fmt = mt9m111_find_datafmt(mt9m111, mf->code);
+       /* try_fmt() guarantees fmt != NULL && fmt->code == mf->code */
+
+       ret = mt9m111_setup_geometry(mt9m111, rect, mf->width, mf->height, mf->code);
+       if (!ret)
+               ret = mt9m111_set_pixfmt(mt9m111, mf->code);
+       if (!ret) {
+               mt9m111->width  = mf->width;
+               mt9m111->height = mf->height;
+               mt9m111->fmt    = fmt;
+       }
+
+       return ret;
+}
+
 static int mt9m111_g_chip_ident(struct v4l2_subdev *sd,
                                struct v4l2_dbg_chip_ident *id)
 {
@@ -765,7 +764,8 @@ static void mt9m111_restore_state(struct mt9m111 *mt9m111)
 {
        mt9m111_set_context(mt9m111, mt9m111->ctx);
        mt9m111_set_pixfmt(mt9m111, mt9m111->fmt->code);
-       mt9m111_setup_rect(mt9m111, &mt9m111->rect);
+       mt9m111_setup_geometry(mt9m111, &mt9m111->rect,
+                       mt9m111->width, mt9m111->height, mt9m111->fmt->code);
        v4l2_ctrl_handler_setup(&mt9m111->hdl);
 }