[media] v4l: omap4iss: csi2: Replace manual if statement with a subclk field

Instead of manually checking whether the CSI2 module is CSI2a or CSI2b
in order to select the right subclock to enable/disable, add a subclk
field to the iss_csi2 structure, initialize it with the corresponding
subclock value and use it at runtime.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

drivers/staging/media/omap4iss/iss_csi2.c

@@ -1062,10 +1062,7 @@ static int csi2_set_stream(struct v4l2_subdev *sd, int enable)
 		if (enable == ISS_PIPELINE_STREAM_STOPPED)
 			return 0;
 
-		if (csi2 == &iss->csi2a)
-			omap4iss_subclk_enable(iss, OMAP4_ISS_SUBCLK_CSI2_A);
-		else if (csi2 == &iss->csi2b)
-			omap4iss_subclk_enable(iss, OMAP4_ISS_SUBCLK_CSI2_B);
+		omap4iss_subclk_enable(iss, csi2->subclk);
 	}
 
 	switch (enable) {
@@ -1106,10 +1103,7 @@ static int csi2_set_stream(struct v4l2_subdev *sd, int enable)
 		csi2_if_enable(csi2, 0);
 		csi2_irq_ctx_set(csi2, 0);
 		omap4iss_csiphy_release(csi2->phy);
-		if (csi2 == &iss->csi2a)
-			omap4iss_subclk_disable(iss, OMAP4_ISS_SUBCLK_CSI2_A);
-		else if (csi2 == &iss->csi2b)
-			omap4iss_subclk_disable(iss, OMAP4_ISS_SUBCLK_CSI2_B);
+		omap4iss_subclk_disable(iss, csi2->subclk);
 		iss_video_dmaqueue_flags_clr(video_out);
 		break;
 	}
@@ -1311,6 +1305,7 @@ int omap4iss_csi2_init(struct iss_device *iss)
 	csi2a->available = 1;
 	csi2a->regs1 = OMAP4_ISS_MEM_CSI2_A_REGS1;
 	csi2a->phy = &iss->csiphy1;
+	csi2a->subclk = OMAP4_ISS_SUBCLK_CSI2_A;
 	csi2a->state = ISS_PIPELINE_STREAM_STOPPED;
 	init_waitqueue_head(&csi2a->wait);
 
@@ -1322,6 +1317,7 @@ int omap4iss_csi2_init(struct iss_device *iss)
 	csi2b->available = 1;
 	csi2b->regs1 = OMAP4_ISS_MEM_CSI2_B_REGS1;
 	csi2b->phy = &iss->csiphy2;
+	csi2b->subclk = OMAP4_ISS_SUBCLK_CSI2_B;
 	csi2b->state = ISS_PIPELINE_STREAM_STOPPED;
 	init_waitqueue_head(&csi2b->wait);
 

drivers/staging/media/omap4iss/iss_csi2.h

@@ -131,6 +131,8 @@ struct iss_csi2_device {
 	/* memory resources, as defined in enum iss_mem_resources */
 	unsigned int regs1;
 	unsigned int regs2;
+	/* ISP subclock, as defined in enum iss_isp_subclk_resource */
+	unsigned int subclk;
 
 	u32 output; /* output to IPIPEIF, memory or both? */
 	bool dpcm_decompress;