media: qcom: camss: Untangle if/else spaghetti in camss

We have a very convoluted if/else legacy here which needs to be
rationalised to make it more sustainable.

Adding in another Soc or two will make some of these if statements into
increasingly large multi-clause behemoths.

Introduce switches in the obvious places to despaghetiify.
Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Acked-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>

drivers/media/platform/qcom/camss/camss-csiphy.c

@@ -558,19 +558,21 @@ int msm_csiphy_subdev_init(struct camss *camss,
 	csiphy->cfg.combo_mode = 0;
 	csiphy->ops = res->ops;
 
-	if (camss->res->version == CAMSS_8x16) {
+	switch (camss->res->version) {
+	case CAMSS_8x16:
 		csiphy->formats = csiphy_formats_8x16;
 		csiphy->nformats = ARRAY_SIZE(csiphy_formats_8x16);
-	} else if (camss->res->version == CAMSS_8x96 ||
-		   camss->res->version == CAMSS_660) {
+		break;
+	case CAMSS_8x96:
+	case CAMSS_660:
 		csiphy->formats = csiphy_formats_8x96;
 		csiphy->nformats = ARRAY_SIZE(csiphy_formats_8x96);
-	} else if (camss->res->version == CAMSS_845 ||
-		   camss->res->version == CAMSS_8250) {
+		break;
+	case CAMSS_845:
+	case CAMSS_8250:
 		csiphy->formats = csiphy_formats_sdm845;
 		csiphy->nformats = ARRAY_SIZE(csiphy_formats_sdm845);
-	} else {
-		return -EINVAL;
+		break;
 	}
 
 	/* Memory */

drivers/media/platform/qcom/camss/camss-vfe.c

@@ -170,7 +170,8 @@ static u32 vfe_src_pad_code(struct vfe_line *line, u32 sink_code,
 {
 	struct vfe_device *vfe = to_vfe(line);
 
-	if (vfe->camss->res->version == CAMSS_8x16)
+	switch (vfe->camss->res->version) {
+	case CAMSS_8x16:
 		switch (sink_code) {
 		case MEDIA_BUS_FMT_YUYV8_1X16:
 		{
@@ -218,10 +219,11 @@ static u32 vfe_src_pad_code(struct vfe_line *line, u32 sink_code,
 
 			return sink_code;
 		}
-	else if (vfe->camss->res->version == CAMSS_8x96 ||
-		 vfe->camss->res->version == CAMSS_660 ||
-		 vfe->camss->res->version == CAMSS_845 ||
-		 vfe->camss->res->version == CAMSS_8250)
+		break;
+	case CAMSS_8x96:
+	case CAMSS_660:
+	case CAMSS_845:
+	case CAMSS_8250:
 		switch (sink_code) {
 		case MEDIA_BUS_FMT_YUYV8_1X16:
 		{
@@ -281,8 +283,9 @@ static u32 vfe_src_pad_code(struct vfe_line *line, u32 sink_code,
 
 			return sink_code;
 		}
-	else
-		return 0;
+		break;
+	}
+	return 0;
 }
 
 int vfe_reset(struct vfe_device *vfe)
@@ -1379,7 +1382,8 @@ int msm_vfe_subdev_init(struct camss *camss, struct vfe_device *vfe,
 		init_completion(&l->output.sof);
 		init_completion(&l->output.reg_update);
 
-		if (camss->res->version == CAMSS_8x16) {
+		switch (camss->res->version) {
+		case CAMSS_8x16:
 			if (i == VFE_LINE_PIX) {
 				l->formats = formats_pix_8x16;
 				l->nformats = ARRAY_SIZE(formats_pix_8x16);
@@ -1387,8 +1391,9 @@ int msm_vfe_subdev_init(struct camss *camss, struct vfe_device *vfe,
 				l->formats = formats_rdi_8x16;
 				l->nformats = ARRAY_SIZE(formats_rdi_8x16);
 			}
-		} else if (camss->res->version == CAMSS_8x96 ||
-			   camss->res->version == CAMSS_660) {
+			break;
+		case CAMSS_8x96:
+		case CAMSS_660:
 			if (i == VFE_LINE_PIX) {
 				l->formats = formats_pix_8x96;
 				l->nformats = ARRAY_SIZE(formats_pix_8x96);
@@ -1396,12 +1401,12 @@ int msm_vfe_subdev_init(struct camss *camss, struct vfe_device *vfe,
 				l->formats = formats_rdi_8x96;
 				l->nformats = ARRAY_SIZE(formats_rdi_8x96);
 			}
-		} else if (camss->res->version == CAMSS_845 ||
-			   camss->res->version == CAMSS_8250) {
+			break;
+		case CAMSS_845:
+		case CAMSS_8250:
 			l->formats = formats_rdi_845;
 			l->nformats = ARRAY_SIZE(formats_rdi_845);
-		} else {
-			return -EINVAL;
+			break;
 		}
 	}
 

drivers/media/platform/qcom/camss/camss-video.c

@@ -1006,7 +1006,8 @@ int msm_video_register(struct camss_video *video, struct v4l2_device *v4l2_dev,
 
 	mutex_init(&video->lock);
 
-	if (video->camss->res->version == CAMSS_8x16) {
+	switch (video->camss->res->version) {
+	case CAMSS_8x16:
 		if (is_pix) {
 			video->formats = formats_pix_8x16;
 			video->nformats = ARRAY_SIZE(formats_pix_8x16);
@@ -1014,8 +1015,9 @@ int msm_video_register(struct camss_video *video, struct v4l2_device *v4l2_dev,
 			video->formats = formats_rdi_8x16;
 			video->nformats = ARRAY_SIZE(formats_rdi_8x16);
 		}
-	} else if (video->camss->res->version == CAMSS_8x96 ||
-		   video->camss->res->version == CAMSS_660) {
+		break;
+	case CAMSS_8x96:
+	case CAMSS_660:
 		if (is_pix) {
 			video->formats = formats_pix_8x96;
 			video->nformats = ARRAY_SIZE(formats_pix_8x96);
@@ -1023,13 +1025,12 @@ int msm_video_register(struct camss_video *video, struct v4l2_device *v4l2_dev,
 			video->formats = formats_rdi_8x96;
 			video->nformats = ARRAY_SIZE(formats_rdi_8x96);
 		}
-	}  else if (video->camss->res->version == CAMSS_845 ||
-		    video->camss->res->version == CAMSS_8250) {
+		break;
+	case CAMSS_845:
+	case CAMSS_8250:
 		video->formats = formats_rdi_845;
 		video->nformats = ARRAY_SIZE(formats_rdi_845);
-	} else {
-		ret = -EINVAL;
-		goto error_video_register;
+		break;
 	}
 
 	ret = msm_video_init_format(video);