From ddf289f98b5ef664e4606205cf31d147eab76b18 Mon Sep 17 00:00:00 2001 From: Frank Schaefer Date: Sun, 20 Jan 2013 09:26:47 -0300 Subject: [PATCH] [media] em28xx: overhaul em28xx_capture_area_set() MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit - move the bit shifting of width+height values inside the function - fix the debug message format and output values - add comment about the size limit (e.g. EM277x supports >2MPix) - make void, because error checking is incomplete and we never check the returned value (we would continue anyway) Signed-off-by: Frank Schäfer Signed-off-by: Mauro Carvalho Chehab --- drivers/media/usb/em28xx/em28xx-core.c | 22 ++++++++++++---------- 1 file changed, 12 insertions(+), 10 deletions(-) diff --git a/drivers/media/usb/em28xx/em28xx-core.c b/drivers/media/usb/em28xx/em28xx-core.c index 80f87bb..ee00f9e 100644 --- a/drivers/media/usb/em28xx/em28xx-core.c +++ b/drivers/media/usb/em28xx/em28xx-core.c @@ -733,22 +733,24 @@ static int em28xx_accumulator_set(struct em28xx *dev, u8 xmin, u8 xmax, return em28xx_write_regs(dev, EM28XX_R2B_YMAX, &ymax, 1); } -static int em28xx_capture_area_set(struct em28xx *dev, u8 hstart, u8 vstart, +static void em28xx_capture_area_set(struct em28xx *dev, u8 hstart, u8 vstart, u16 width, u16 height) { - u8 cwidth = width; - u8 cheight = height; - u8 overflow = (height >> 7 & 0x02) | (width >> 8 & 0x01); + u8 cwidth = width >> 2; + u8 cheight = height >> 2; + u8 overflow = (height >> 9 & 0x02) | (width >> 10 & 0x01); + /* NOTE: size limit: 2047x1023 = 2MPix */ - em28xx_coredbg("em28xx Area Set: (%d,%d)\n", - (width | (overflow & 2) << 7), - (height | (overflow & 1) << 8)); + em28xx_coredbg("capture area set to (%d,%d): %dx%d\n", + hstart, vstart, + ((overflow & 2) << 9 | cwidth << 2), + ((overflow & 1) << 10 | cheight << 2)); em28xx_write_regs(dev, EM28XX_R1C_HSTART, &hstart, 1); em28xx_write_regs(dev, EM28XX_R1D_VSTART, &vstart, 1); em28xx_write_regs(dev, EM28XX_R1E_CWIDTH, &cwidth, 1); em28xx_write_regs(dev, EM28XX_R1F_CHEIGHT, &cheight, 1); - return em28xx_write_regs(dev, EM28XX_R1B_OFLOW, &overflow, 1); + em28xx_write_regs(dev, EM28XX_R1B_OFLOW, &overflow, 1); } static int em28xx_scaler_set(struct em28xx *dev, u16 h, u16 v) @@ -801,9 +803,9 @@ int em28xx_resolution_set(struct em28xx *dev) it out, we end up with the same format as the rest of the VBI region */ if (em28xx_vbi_supported(dev) == 1) - em28xx_capture_area_set(dev, 0, 2, width >> 2, height >> 2); + em28xx_capture_area_set(dev, 0, 2, width, height); else - em28xx_capture_area_set(dev, 0, 0, width >> 2, height >> 2); + em28xx_capture_area_set(dev, 0, 0, width, height); return em28xx_scaler_set(dev, dev->hscale, dev->vscale); } -- 2.7.4