media: imx-jpeg: Encoder support to set jpeg quality

Implement V4L2_CID_JPEG_COMPRESSION_QUALITY
to set jpeg quality
Signed-off-by: NMing Qian <ming.qian@nxp.com>
Signed-off-by: NHans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: NMauro Carvalho Chehab <mchehab@kernel.org>

drivers/media/platform/nxp/imx-jpeg/mxc-jpeg-hw.c

@@ -100,9 +100,6 @@ void mxc_jpeg_enc_mode_conf(struct device *dev, void __iomem *reg)
 
 	/* all markers and segments */
 	writel(0x3ff, reg + CAST_CFG_MODE);
-
-	/* quality factor */
-	writel(0x4b, reg + CAST_QUALITY);
 }
 
 void mxc_jpeg_enc_mode_go(struct device *dev, void __iomem *reg)
@@ -114,6 +111,14 @@ void mxc_jpeg_enc_mode_go(struct device *dev, void __iomem *reg)
 	writel(0x140, reg + CAST_MODE);
 }
 
+void mxc_jpeg_enc_set_quality(struct device *dev, void __iomem *reg, u8 quality)
+{
+	dev_dbg(dev, "CAST Encoder Quality %d...\n", quality);
+
+	/* quality factor */
+	writel(quality, reg + CAST_QUALITY);
+}
+
 void mxc_jpeg_dec_mode_go(struct device *dev, void __iomem *reg)
 {
 	dev_dbg(dev, "CAST Decoder GO...\n");

drivers/media/platform/nxp/imx-jpeg/mxc-jpeg-hw.h

@@ -119,6 +119,7 @@ int mxc_jpeg_enable(void __iomem *reg);
 void wait_frmdone(struct device *dev, void __iomem *reg);
 void mxc_jpeg_enc_mode_conf(struct device *dev, void __iomem *reg);
 void mxc_jpeg_enc_mode_go(struct device *dev, void __iomem *reg);
+void mxc_jpeg_enc_set_quality(struct device *dev, void __iomem *reg, u8 quality);
 void mxc_jpeg_dec_mode_go(struct device *dev, void __iomem *reg);
 int mxc_jpeg_get_slot(void __iomem *reg);
 u32 mxc_jpeg_get_offset(void __iomem *reg, int slot);

drivers/media/platform/nxp/imx-jpeg/mxc-jpeg.c

@@ -623,6 +623,7 @@ static irqreturn_t mxc_jpeg_dec_irq(int irq, void *priv)
 	    ctx->enc_state == MXC_JPEG_ENC_CONF) {
 		ctx->enc_state = MXC_JPEG_ENCODING;
 		dev_dbg(dev, "Encoder config finished. Start encoding...\n");
+		mxc_jpeg_enc_set_quality(dev, reg, ctx->jpeg_quality);
 		mxc_jpeg_enc_mode_go(dev, reg);
 		goto job_unlock;
 	}
@@ -1562,6 +1563,56 @@ static void mxc_jpeg_set_default_params(struct mxc_jpeg_ctx *ctx)
 	}
 }
 
+static int mxc_jpeg_s_ctrl(struct v4l2_ctrl *ctrl)
+{
+	struct mxc_jpeg_ctx *ctx =
+		container_of(ctrl->handler, struct mxc_jpeg_ctx, ctrl_handler);
+
+	switch (ctrl->id) {
+	case V4L2_CID_JPEG_COMPRESSION_QUALITY:
+		ctx->jpeg_quality = ctrl->val;
+		break;
+	default:
+		dev_err(ctx->mxc_jpeg->dev, "Invalid control, id = %d, val = %d\n",
+			ctrl->id, ctrl->val);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static const struct v4l2_ctrl_ops mxc_jpeg_ctrl_ops = {
+	.s_ctrl = mxc_jpeg_s_ctrl,
+};
+
+static void mxc_jpeg_encode_ctrls(struct mxc_jpeg_ctx *ctx)
+{
+	v4l2_ctrl_new_std(&ctx->ctrl_handler, &mxc_jpeg_ctrl_ops,
+			  V4L2_CID_JPEG_COMPRESSION_QUALITY, 1, 100, 1, 75);
+}
+
+static int mxc_jpeg_ctrls_setup(struct mxc_jpeg_ctx *ctx)
+{
+	int err;
+
+	v4l2_ctrl_handler_init(&ctx->ctrl_handler, 2);
+
+	if (ctx->mxc_jpeg->mode == MXC_JPEG_ENCODE)
+		mxc_jpeg_encode_ctrls(ctx);
+
+	if (ctx->ctrl_handler.error) {
+		err = ctx->ctrl_handler.error;
+
+		v4l2_ctrl_handler_free(&ctx->ctrl_handler);
+		return err;
+	}
+
+	err = v4l2_ctrl_handler_setup(&ctx->ctrl_handler);
+	if (err)
+		v4l2_ctrl_handler_free(&ctx->ctrl_handler);
+	return err;
+}
+
 static int mxc_jpeg_open(struct file *file)
 {
 	struct mxc_jpeg_dev *mxc_jpeg = video_drvdata(file);
@@ -1593,6 +1644,12 @@ static int mxc_jpeg_open(struct file *file)
 		goto error;
 	}
 
+	ret = mxc_jpeg_ctrls_setup(ctx);
+	if (ret) {
+		dev_err(ctx->mxc_jpeg->dev, "failed to setup mxc jpeg controls\n");
+		goto err_ctrls_setup;
+	}
+	ctx->fh.ctrl_handler = &ctx->ctrl_handler;
 	mxc_jpeg_set_default_params(ctx);
 	ctx->slot = MXC_MAX_SLOTS; /* slot not allocated yet */
 
@@ -1604,6 +1661,8 @@ static int mxc_jpeg_open(struct file *file)
 
 	return 0;
 
+err_ctrls_setup:
+	v4l2_m2m_ctx_release(ctx->fh.m2m_ctx);
 error:
 	v4l2_fh_del(&ctx->fh);
 	v4l2_fh_exit(&ctx->fh);
@@ -1956,6 +2015,8 @@ static int mxc_jpeg_subscribe_event(struct v4l2_fh *fh,
 		return v4l2_event_subscribe(fh, sub, 0, NULL);
 	case V4L2_EVENT_SOURCE_CHANGE:
 		return v4l2_src_change_event_subscribe(fh, sub);
+	case V4L2_EVENT_CTRL:
+		return v4l2_ctrl_subscribe_event(fh, sub);
 	default:
 		return -EINVAL;
 	}
@@ -2029,6 +2090,7 @@ static int mxc_jpeg_release(struct file *file)
 	else
 		dev_dbg(dev, "Release JPEG encoder instance on slot %d.",
 			ctx->slot);
+	v4l2_ctrl_handler_free(&ctx->ctrl_handler);
 	v4l2_m2m_ctx_release(ctx->fh.m2m_ctx);
 	v4l2_fh_del(&ctx->fh);
 	v4l2_fh_exit(&ctx->fh);

drivers/media/platform/nxp/imx-jpeg/mxc-jpeg.h

@@ -97,6 +97,8 @@ struct mxc_jpeg_ctx {
 	unsigned int			slot;
 	unsigned int			source_change;
 	bool				header_parsed;
+	struct v4l2_ctrl_handler	ctrl_handler;
+	u8				jpeg_quality;
 };
 
 struct mxc_jpeg_slot_data {