media: imx: imx7-media-csi: Merge hw_reset() with init_interface()

The imx7_csi_hw_reset() and imx7_csi_init_interface() functions are
always called together. Merge them. This allows simplifying the code by
avoiding duplicated register writes.

As the imx7_csi_hw_reset() function didn't perform a hardware reset by
initialized the registers to reset defaults (in addition to resetting
the frame counter), name the resulting function imx7_csi_init_default()
as it sets default values.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Rui Miguel Silva <rmfrfs@gmail.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/staging/media/imx/imx7-media-csi.c

@@ -212,17 +212,6 @@ static void imx7_csi_reg_write(struct imx7_csi *csi, unsigned int value,
 	writel(value, csi->regbase + offset);
 }
 
-static void imx7_csi_hw_reset(struct imx7_csi *csi)
-{
-	imx7_csi_reg_write(csi,
-			   imx7_csi_reg_read(csi, CSI_CSICR3) | BIT_FRMCNT_RST,
-			   CSI_CSICR3);
-
-	imx7_csi_reg_write(csi, BIT_EXT_VSYNC | BIT_HSYNC_POL, CSI_CSICR1);
-	imx7_csi_reg_write(csi, 0, CSI_CSICR2);
-	imx7_csi_reg_write(csi, 0, CSI_CSICR3);
-}
-
 static u32 imx7_csi_irq_clear(struct imx7_csi *csi)
 {
 	u32 isr;
@@ -233,20 +222,18 @@ static u32 imx7_csi_irq_clear(struct imx7_csi *csi)
 	return isr;
 }
 
-static void imx7_csi_init_interface(struct imx7_csi *csi)
+static void imx7_csi_init_default(struct imx7_csi *csi)
 {
-	unsigned int val = 0;
-	unsigned int imag_para;
-
-	val = BIT_SOF_POL | BIT_REDGE | BIT_GCLK_MODE | BIT_HSYNC_POL |
-		BIT_FCC | BIT_MCLKDIV(1) | BIT_MCLKEN;
-	imx7_csi_reg_write(csi, val, CSI_CSICR1);
+	imx7_csi_reg_write(csi, BIT_SOF_POL | BIT_REDGE | BIT_GCLK_MODE |
+			   BIT_HSYNC_POL | BIT_FCC | BIT_MCLKDIV(1) |
+			   BIT_MCLKEN, CSI_CSICR1);
+	imx7_csi_reg_write(csi, 0, CSI_CSICR2);
+	imx7_csi_reg_write(csi, BIT_FRMCNT_RST, CSI_CSICR3);
 
-	imag_para = BIT_IMAGE_WIDTH(800) | BIT_IMAGE_HEIGHT(600);
-	imx7_csi_reg_write(csi, imag_para, CSI_CSIIMAG_PARA);
+	imx7_csi_reg_write(csi, BIT_IMAGE_WIDTH(800) | BIT_IMAGE_HEIGHT(600),
+			   CSI_CSIIMAG_PARA);
 
-	val = BIT_DMA_REFLASH_RFF;
-	imx7_csi_reg_write(csi, val, CSI_CSICR3);
+	imx7_csi_reg_write(csi, BIT_DMA_REFLASH_RFF, CSI_CSICR3);
 }
 
 static void imx7_csi_hw_enable_irq(struct imx7_csi *csi)
@@ -578,8 +565,7 @@ static int imx7_csi_init(struct imx7_csi *csi)
 	if (ret < 0)
 		return ret;
 
-	imx7_csi_hw_reset(csi);
-	imx7_csi_init_interface(csi);
+	imx7_csi_init_default(csi);
 	imx7_csi_dmareq_rff_enable(csi);
 
 	ret = imx7_csi_dma_setup(csi);
@@ -594,8 +580,7 @@ static int imx7_csi_init(struct imx7_csi *csi)
 static void imx7_csi_deinit(struct imx7_csi *csi)
 {
 	imx7_csi_dma_cleanup(csi);
-	imx7_csi_hw_reset(csi);
-	imx7_csi_init_interface(csi);
+	imx7_csi_init_default(csi);
 	imx7_csi_dmareq_rff_disable(csi);
 	clk_disable_unprepare(csi->mclk);
 }