V4L/DVB: gspca_tv8532: remove a whole bunch of unnecessary register writes

There is a problem with certain tv8532 cams, where sometimes there
hsync/vsync locks one pixel of where it normally locks. While trying to
fix this (which I failed to do). I noticed there are lots if duplicate
register writes and unnecessary register reads in the tv8532 driver. This
patch cleanes these ups (which has no negative effects, but unfortunately
also does not help).

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/gspca/tv8532.c

@@ -129,18 +129,6 @@ static const u8 eeprom_data[][3] = {
 	{0x05, 0x09, 0xf1},
 };
 
-static int reg_r(struct gspca_dev *gspca_dev,
-		 __u16 index)
-{
-	usb_control_msg(gspca_dev->dev,
-			usb_rcvctrlpipe(gspca_dev->dev, 0),
-			0x03,
-			USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
-			0,	/* value */
-			index, gspca_dev->usb_buf, 1,
-			500);
-	return gspca_dev->usb_buf[0];
-}
 
 /* write 1 byte */
 static void reg_w1(struct gspca_dev *gspca_dev,
@@ -183,7 +171,6 @@ static void tv_8532WriteEEprom(struct gspca_dev *gspca_dev)
 	}
 	reg_w1(gspca_dev, R07_TABLE_LEN, i);
 	reg_w1(gspca_dev, R01_TIMING_CONTROL_LOW, CMD_EEprom_Close);
-	msleep(10);
 }
 
 /* this function is called at probe time */
@@ -201,49 +188,8 @@ static int sd_config(struct gspca_dev *gspca_dev,
 	return 0;
 }
 
-static void tv_8532ReadRegisters(struct gspca_dev *gspca_dev)
-{
-	int i;
-	static u8 reg_tb[] = {
-		R0C_AD_WIDTHL,
-		R0D_AD_WIDTHH,
-		R28_QUANT,
-		R29_LINE,
-		R2C_POLARITY,
-		R2D_POINT,
-		R2E_POINTH,
-		R2F_POINTB,
-		R30_POINTBH,
-		R2A_HIGH_BUDGET,
-		R2B_LOW_BUDGET,
-		R34_VID,
-		R35_VIDH,
-		R36_PID,
-		R37_PIDH,
-		R83_AD_IDH,
-		R10_AD_COL_BEGINL,
-		R11_AD_COL_BEGINH,
-		R14_AD_ROW_BEGINL,
-		R15_AD_ROWBEGINH,
-		0
-	};
-
-	i = 0;
-	do {
-		reg_r(gspca_dev, reg_tb[i]);
-		i++;
-	} while (reg_tb[i] != 0);
-}
-
 static void tv_8532_setReg(struct gspca_dev *gspca_dev)
 {
-	reg_w1(gspca_dev, R10_AD_COL_BEGINL, 0x44);
-						/* begin active line */
-	reg_w1(gspca_dev, R11_AD_COL_BEGINH, 0x00);
-						/* mirror and digital gain */
-	reg_w1(gspca_dev, R00_PART_CONTROL, LATENT_CHANGE | EXPO_CHANGE);
-						/* = 0x84 */
-
 	reg_w1(gspca_dev, R3B_Test3, 0x0a);	/* Test0Sel = 10 */
 	/******************************************************/
 	reg_w1(gspca_dev, R0E_AD_HEIGHTL, 0x90);
@@ -255,75 +201,17 @@ static void tv_8532_setReg(struct gspca_dev *gspca_dev)
 						/* mirror and digital gain */
 	reg_w1(gspca_dev, R14_AD_ROW_BEGINL, 0x0a);
 
-	reg_w1(gspca_dev, R91_AD_SLOPEREG, 0x00);
 	reg_w1(gspca_dev, R94_AD_BITCONTROL, 0x02);
-
-	reg_w1(gspca_dev, R01_TIMING_CONTROL_LOW, CMD_EEprom_Close);
-
 	reg_w1(gspca_dev, R91_AD_SLOPEREG, 0x00);
 	reg_w1(gspca_dev, R00_PART_CONTROL, LATENT_CHANGE | EXPO_CHANGE);
 						/* = 0x84 */
 }
 
-static void tv_8532_PollReg(struct gspca_dev *gspca_dev)
-{
-	int i;
-
-	/* strange polling from tgc */
-	for (i = 0; i < 10; i++) {
-		reg_w1(gspca_dev, R2C_POLARITY, 0x10);
-		reg_w1(gspca_dev, R00_PART_CONTROL,
-				LATENT_CHANGE | EXPO_CHANGE);
-		reg_w1(gspca_dev, R31_UPD, 0x01);
-	}
-}
-
 /* this function is called at probe and resume time */
 static int sd_init(struct gspca_dev *gspca_dev)
 {
 	tv_8532WriteEEprom(gspca_dev);
 
-	reg_w1(gspca_dev, R91_AD_SLOPEREG, 0x32);	/* slope begin 1,7V,
-							 * slope rate 2 */
-	reg_w1(gspca_dev, R94_AD_BITCONTROL, 0x00);
-	tv_8532ReadRegisters(gspca_dev);
-	reg_w1(gspca_dev, R3B_Test3, 0x0b);
-	reg_w2(gspca_dev, R0E_AD_HEIGHTL, 0x0190);
-	reg_w2(gspca_dev, R1C_AD_EXPOSE_TIMEL, 0x018f);
-	reg_w1(gspca_dev, R0C_AD_WIDTHL, 0xe8);
-	reg_w1(gspca_dev, R0D_AD_WIDTHH, 0x03);
-
-	/*******************************************************************/
-	reg_w1(gspca_dev, R28_QUANT, 0x90);
-					/* no compress - fixed Q - quant 0 */
-	reg_w1(gspca_dev, R29_LINE, 0x81);
-					/* 0x84; // CIF | 4 packet 0x29 */
-
-	/************************************************/
-	reg_w1(gspca_dev, R2C_POLARITY, 0x10);
-						/* 0x48; //0x08; 0x2c */
-	reg_w1(gspca_dev, R2D_POINT, 0x14);
-						/* 0x38; 0x2d */
-	reg_w1(gspca_dev, R2E_POINTH, 0x01);
-						/* 0x04; 0x2e */
-	reg_w1(gspca_dev, R2F_POINTB, 0x12);
-						/* 0x04; 0x2f */
-	reg_w1(gspca_dev, R30_POINTBH, 0x01);
-						/* 0x04; 0x30 */
-	reg_w1(gspca_dev, R00_PART_CONTROL, LATENT_CHANGE | EXPO_CHANGE);
-						/* 0x00<-0x84 */
-	/*************************************************/
-	reg_w1(gspca_dev, R31_UPD, 0x01);	/* update registers */
-	msleep(200);
-	reg_w1(gspca_dev, R31_UPD, 0x00);		/* end update */
-	/*************************************************/
-	tv_8532_setReg(gspca_dev);
-	/*************************************************/
-	reg_w1(gspca_dev, R3B_Test3, 0x0b);	/* Test0Sel = 11 = GPIO */
-	/*************************************************/
-	tv_8532_setReg(gspca_dev);
-	/*************************************************/
-	tv_8532_PollReg(gspca_dev);
 	return 0;
 }
 
@@ -341,15 +229,6 @@ static int sd_start(struct gspca_dev *gspca_dev)
 {
 	struct sd *sd = (struct sd *) gspca_dev;
 
-	reg_w1(gspca_dev, R91_AD_SLOPEREG, 0x32);	/* slope begin 1,7V,
-							 * slope rate 2 */
-	reg_w1(gspca_dev, R94_AD_BITCONTROL, 0x00);
-	tv_8532ReadRegisters(gspca_dev);
-	reg_w1(gspca_dev, R3B_Test3, 0x0b);
-
-	reg_w2(gspca_dev, R0E_AD_HEIGHTL, 0x0190);
-	setbrightness(gspca_dev);
-
 	reg_w1(gspca_dev, R0C_AD_WIDTHL, 0xe8);		/* 0x20; 0x0c */
 	reg_w1(gspca_dev, R0D_AD_WIDTHH, 0x03);
 
@@ -371,19 +250,14 @@ static int sd_start(struct gspca_dev *gspca_dev)
 	reg_w1(gspca_dev, R2E_POINTH, 0x01);
 	reg_w1(gspca_dev, R2F_POINTB, 0x12);
 	reg_w1(gspca_dev, R30_POINTBH, 0x01);
-	reg_w1(gspca_dev, R00_PART_CONTROL, LATENT_CHANGE | EXPO_CHANGE);
+
+	tv_8532_setReg(gspca_dev);
+
+	setbrightness(gspca_dev);
+
 	/************************************************/
 	reg_w1(gspca_dev, R31_UPD, 0x01);	/* update registers */
 	msleep(200);
-	reg_w1(gspca_dev, R31_UPD, 0x00);		/* end update */
-	/************************************************/
-	tv_8532_setReg(gspca_dev);
-	/************************************************/
-	reg_w1(gspca_dev, R3B_Test3, 0x0b);	/* Test0Sel = 11 = GPIO */
-	/************************************************/
-	tv_8532_setReg(gspca_dev);
-	/************************************************/
-	tv_8532_PollReg(gspca_dev);
 	reg_w1(gspca_dev, R31_UPD, 0x00);	/* end update */
 
 	gspca_dev->empty_packet = 0;		/* check the empty packets */