diff options
author | Hans Verkuil <hans.verkuil@cisco.com> | 2013-07-29 11:40:56 (GMT) |
---|---|---|
committer | Mauro Carvalho Chehab <m.chehab@samsung.com> | 2013-08-18 11:16:54 (GMT) |
commit | 2576415846bcbad3c0a6885fc44f950837106364 (patch) | |
tree | 99772fbb135740430c638fc3eb6aa91f0a6f751a /drivers | |
parent | b18787ed1ce32eb0c2ce2323220abd4ed93c4b97 (diff) | |
download | linux-fsl-qoriq-2576415846bcbad3c0a6885fc44f950837106364.tar.xz |
[media] v4l2: move dv-timings related code to v4l2-dv-timings.c
v4l2-common.c contained a bunch of dv-timings related functions.
Move that to the new v4l2-dv-timings.c which is a more appropriate
place for them.
There aren't many drivers that do HDTV, so it is a good idea to separate
common code related to that into a module of its own.
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Acked-by: Lad, Prabhakar <prabhakar.csengg@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/media/i2c/ad9389b.c | 1 | ||||
-rw-r--r-- | drivers/media/i2c/adv7604.c | 1 | ||||
-rw-r--r-- | drivers/media/i2c/ths8200.c | 1 | ||||
-rw-r--r-- | drivers/media/usb/hdpvr/hdpvr-video.c | 1 | ||||
-rw-r--r-- | drivers/media/v4l2-core/v4l2-common.c | 357 | ||||
-rw-r--r-- | drivers/media/v4l2-core/v4l2-dv-timings.c | 358 |
6 files changed, 361 insertions, 358 deletions
diff --git a/drivers/media/i2c/ad9389b.c b/drivers/media/i2c/ad9389b.c index ba4364d..2fa8d72 100644 --- a/drivers/media/i2c/ad9389b.c +++ b/drivers/media/i2c/ad9389b.c @@ -33,6 +33,7 @@ #include <linux/v4l2-dv-timings.h> #include <media/v4l2-device.h> #include <media/v4l2-common.h> +#include <media/v4l2-dv-timings.h> #include <media/v4l2-ctrls.h> #include <media/ad9389b.h> diff --git a/drivers/media/i2c/adv7604.c b/drivers/media/i2c/adv7604.c index 1d675b5..181a6c3 100644 --- a/drivers/media/i2c/adv7604.c +++ b/drivers/media/i2c/adv7604.c @@ -38,6 +38,7 @@ #include <linux/v4l2-dv-timings.h> #include <media/v4l2-device.h> #include <media/v4l2-ctrls.h> +#include <media/v4l2-dv-timings.h> #include <media/adv7604.h> static int debug; diff --git a/drivers/media/i2c/ths8200.c b/drivers/media/i2c/ths8200.c index 8a29810..aef7c0e 100644 --- a/drivers/media/i2c/ths8200.c +++ b/drivers/media/i2c/ths8200.c @@ -21,6 +21,7 @@ #include <linux/module.h> #include <linux/v4l2-dv-timings.h> +#include <media/v4l2-dv-timings.h> #include <media/v4l2-async.h> #include <media/v4l2-device.h> diff --git a/drivers/media/usb/hdpvr/hdpvr-video.c b/drivers/media/usb/hdpvr/hdpvr-video.c index 4f8567a..9c67b6e 100644 --- a/drivers/media/usb/hdpvr/hdpvr-video.c +++ b/drivers/media/usb/hdpvr/hdpvr-video.c @@ -24,6 +24,7 @@ #include <linux/v4l2-dv-timings.h> #include <media/v4l2-dev.h> #include <media/v4l2-common.h> +#include <media/v4l2-dv-timings.h> #include <media/v4l2-ioctl.h> #include <media/v4l2-event.h> #include "hdpvr.h" diff --git a/drivers/media/v4l2-core/v4l2-common.c b/drivers/media/v4l2-core/v4l2-common.c index a95e5e2..037d7a5 100644 --- a/drivers/media/v4l2-core/v4l2-common.c +++ b/drivers/media/v4l2-core/v4l2-common.c @@ -495,363 +495,6 @@ void v4l_bound_align_image(u32 *w, unsigned int wmin, unsigned int wmax, } EXPORT_SYMBOL_GPL(v4l_bound_align_image); -/** - * v4l_match_dv_timings - check if two timings match - * @t1 - compare this v4l2_dv_timings struct... - * @t2 - with this struct. - * @pclock_delta - the allowed pixelclock deviation. - * - * Compare t1 with t2 with a given margin of error for the pixelclock. - */ -bool v4l_match_dv_timings(const struct v4l2_dv_timings *t1, - const struct v4l2_dv_timings *t2, - unsigned pclock_delta) -{ - if (t1->type != t2->type || t1->type != V4L2_DV_BT_656_1120) - return false; - if (t1->bt.width == t2->bt.width && - t1->bt.height == t2->bt.height && - t1->bt.interlaced == t2->bt.interlaced && - t1->bt.polarities == t2->bt.polarities && - t1->bt.pixelclock >= t2->bt.pixelclock - pclock_delta && - t1->bt.pixelclock <= t2->bt.pixelclock + pclock_delta && - t1->bt.hfrontporch == t2->bt.hfrontporch && - t1->bt.vfrontporch == t2->bt.vfrontporch && - t1->bt.vsync == t2->bt.vsync && - t1->bt.vbackporch == t2->bt.vbackporch && - (!t1->bt.interlaced || - (t1->bt.il_vfrontporch == t2->bt.il_vfrontporch && - t1->bt.il_vsync == t2->bt.il_vsync && - t1->bt.il_vbackporch == t2->bt.il_vbackporch))) - return true; - return false; -} -EXPORT_SYMBOL_GPL(v4l_match_dv_timings); - -/* - * CVT defines - * Based on Coordinated Video Timings Standard - * version 1.1 September 10, 2003 - */ - -#define CVT_PXL_CLK_GRAN 250000 /* pixel clock granularity */ - -/* Normal blanking */ -#define CVT_MIN_V_BPORCH 7 /* lines */ -#define CVT_MIN_V_PORCH_RND 3 /* lines */ -#define CVT_MIN_VSYNC_BP 550 /* min time of vsync + back porch (us) */ - -/* Normal blanking for CVT uses GTF to calculate horizontal blanking */ -#define CVT_CELL_GRAN 8 /* character cell granularity */ -#define CVT_M 600 /* blanking formula gradient */ -#define CVT_C 40 /* blanking formula offset */ -#define CVT_K 128 /* blanking formula scaling factor */ -#define CVT_J 20 /* blanking formula scaling factor */ -#define CVT_C_PRIME (((CVT_C - CVT_J) * CVT_K / 256) + CVT_J) -#define CVT_M_PRIME (CVT_K * CVT_M / 256) - -/* Reduced Blanking */ -#define CVT_RB_MIN_V_BPORCH 7 /* lines */ -#define CVT_RB_V_FPORCH 3 /* lines */ -#define CVT_RB_MIN_V_BLANK 460 /* us */ -#define CVT_RB_H_SYNC 32 /* pixels */ -#define CVT_RB_H_BPORCH 80 /* pixels */ -#define CVT_RB_H_BLANK 160 /* pixels */ - -/** v4l2_detect_cvt - detect if the given timings follow the CVT standard - * @frame_height - the total height of the frame (including blanking) in lines. - * @hfreq - the horizontal frequency in Hz. - * @vsync - the height of the vertical sync in lines. - * @polarities - the horizontal and vertical polarities (same as struct - * v4l2_bt_timings polarities). - * @fmt - the resulting timings. - * - * This function will attempt to detect if the given values correspond to a - * valid CVT format. If so, then it will return true, and fmt will be filled - * in with the found CVT timings. - */ -bool v4l2_detect_cvt(unsigned frame_height, unsigned hfreq, unsigned vsync, - u32 polarities, struct v4l2_dv_timings *fmt) -{ - int v_fp, v_bp, h_fp, h_bp, hsync; - int frame_width, image_height, image_width; - bool reduced_blanking; - unsigned pix_clk; - - if (vsync < 4 || vsync > 7) - return false; - - if (polarities == V4L2_DV_VSYNC_POS_POL) - reduced_blanking = false; - else if (polarities == V4L2_DV_HSYNC_POS_POL) - reduced_blanking = true; - else - return false; - - /* Vertical */ - if (reduced_blanking) { - v_fp = CVT_RB_V_FPORCH; - v_bp = (CVT_RB_MIN_V_BLANK * hfreq + 999999) / 1000000; - v_bp -= vsync + v_fp; - - if (v_bp < CVT_RB_MIN_V_BPORCH) - v_bp = CVT_RB_MIN_V_BPORCH; - } else { - v_fp = CVT_MIN_V_PORCH_RND; - v_bp = (CVT_MIN_VSYNC_BP * hfreq + 999999) / 1000000 - vsync; - - if (v_bp < CVT_MIN_V_BPORCH) - v_bp = CVT_MIN_V_BPORCH; - } - image_height = (frame_height - v_fp - vsync - v_bp + 1) & ~0x1; - - /* Aspect ratio based on vsync */ - switch (vsync) { - case 4: - image_width = (image_height * 4) / 3; - break; - case 5: - image_width = (image_height * 16) / 9; - break; - case 6: - image_width = (image_height * 16) / 10; - break; - case 7: - /* special case */ - if (image_height == 1024) - image_width = (image_height * 5) / 4; - else if (image_height == 768) - image_width = (image_height * 15) / 9; - else - return false; - break; - default: - return false; - } - - image_width = image_width & ~7; - - /* Horizontal */ - if (reduced_blanking) { - pix_clk = (image_width + CVT_RB_H_BLANK) * hfreq; - pix_clk = (pix_clk / CVT_PXL_CLK_GRAN) * CVT_PXL_CLK_GRAN; - - h_bp = CVT_RB_H_BPORCH; - hsync = CVT_RB_H_SYNC; - h_fp = CVT_RB_H_BLANK - h_bp - hsync; - - frame_width = image_width + CVT_RB_H_BLANK; - } else { - int h_blank; - unsigned ideal_duty_cycle = CVT_C_PRIME - (CVT_M_PRIME * 1000) / hfreq; - - h_blank = (image_width * ideal_duty_cycle + (100 - ideal_duty_cycle) / 2) / - (100 - ideal_duty_cycle); - h_blank = h_blank - h_blank % (2 * CVT_CELL_GRAN); - - if (h_blank * 100 / image_width < 20) { - h_blank = image_width / 5; - h_blank = (h_blank + 0x7) & ~0x7; - } - - pix_clk = (image_width + h_blank) * hfreq; - pix_clk = (pix_clk / CVT_PXL_CLK_GRAN) * CVT_PXL_CLK_GRAN; - - h_bp = h_blank / 2; - frame_width = image_width + h_blank; - - hsync = (frame_width * 8 + 50) / 100; - hsync = hsync - hsync % CVT_CELL_GRAN; - h_fp = h_blank - hsync - h_bp; - } - - fmt->bt.polarities = polarities; - fmt->bt.width = image_width; - fmt->bt.height = image_height; - fmt->bt.hfrontporch = h_fp; - fmt->bt.vfrontporch = v_fp; - fmt->bt.hsync = hsync; - fmt->bt.vsync = vsync; - fmt->bt.hbackporch = frame_width - image_width - h_fp - hsync; - fmt->bt.vbackporch = frame_height - image_height - v_fp - vsync; - fmt->bt.pixelclock = pix_clk; - fmt->bt.standards = V4L2_DV_BT_STD_CVT; - if (reduced_blanking) - fmt->bt.flags |= V4L2_DV_FL_REDUCED_BLANKING; - return true; -} -EXPORT_SYMBOL_GPL(v4l2_detect_cvt); - -/* - * GTF defines - * Based on Generalized Timing Formula Standard - * Version 1.1 September 2, 1999 - */ - -#define GTF_PXL_CLK_GRAN 250000 /* pixel clock granularity */ - -#define GTF_MIN_VSYNC_BP 550 /* min time of vsync + back porch (us) */ -#define GTF_V_FP 1 /* vertical front porch (lines) */ -#define GTF_CELL_GRAN 8 /* character cell granularity */ - -/* Default */ -#define GTF_D_M 600 /* blanking formula gradient */ -#define GTF_D_C 40 /* blanking formula offset */ -#define GTF_D_K 128 /* blanking formula scaling factor */ -#define GTF_D_J 20 /* blanking formula scaling factor */ -#define GTF_D_C_PRIME ((((GTF_D_C - GTF_D_J) * GTF_D_K) / 256) + GTF_D_J) -#define GTF_D_M_PRIME ((GTF_D_K * GTF_D_M) / 256) - -/* Secondary */ -#define GTF_S_M 3600 /* blanking formula gradient */ -#define GTF_S_C 40 /* blanking formula offset */ -#define GTF_S_K 128 /* blanking formula scaling factor */ -#define GTF_S_J 35 /* blanking formula scaling factor */ -#define GTF_S_C_PRIME ((((GTF_S_C - GTF_S_J) * GTF_S_K) / 256) + GTF_S_J) -#define GTF_S_M_PRIME ((GTF_S_K * GTF_S_M) / 256) - -/** v4l2_detect_gtf - detect if the given timings follow the GTF standard - * @frame_height - the total height of the frame (including blanking) in lines. - * @hfreq - the horizontal frequency in Hz. - * @vsync - the height of the vertical sync in lines. - * @polarities - the horizontal and vertical polarities (same as struct - * v4l2_bt_timings polarities). - * @aspect - preferred aspect ratio. GTF has no method of determining the - * aspect ratio in order to derive the image width from the - * image height, so it has to be passed explicitly. Usually - * the native screen aspect ratio is used for this. If it - * is not filled in correctly, then 16:9 will be assumed. - * @fmt - the resulting timings. - * - * This function will attempt to detect if the given values correspond to a - * valid GTF format. If so, then it will return true, and fmt will be filled - * in with the found GTF timings. - */ -bool v4l2_detect_gtf(unsigned frame_height, - unsigned hfreq, - unsigned vsync, - u32 polarities, - struct v4l2_fract aspect, - struct v4l2_dv_timings *fmt) -{ - int pix_clk; - int v_fp, v_bp, h_fp, hsync; - int frame_width, image_height, image_width; - bool default_gtf; - int h_blank; - - if (vsync != 3) - return false; - - if (polarities == V4L2_DV_VSYNC_POS_POL) - default_gtf = true; - else if (polarities == V4L2_DV_HSYNC_POS_POL) - default_gtf = false; - else - return false; - - /* Vertical */ - v_fp = GTF_V_FP; - v_bp = (GTF_MIN_VSYNC_BP * hfreq + 999999) / 1000000 - vsync; - image_height = (frame_height - v_fp - vsync - v_bp + 1) & ~0x1; - - if (aspect.numerator == 0 || aspect.denominator == 0) { - aspect.numerator = 16; - aspect.denominator = 9; - } - image_width = ((image_height * aspect.numerator) / aspect.denominator); - - /* Horizontal */ - if (default_gtf) - h_blank = ((image_width * GTF_D_C_PRIME * hfreq) - - (image_width * GTF_D_M_PRIME * 1000) + - (hfreq * (100 - GTF_D_C_PRIME) + GTF_D_M_PRIME * 1000) / 2) / - (hfreq * (100 - GTF_D_C_PRIME) + GTF_D_M_PRIME * 1000); - else - h_blank = ((image_width * GTF_S_C_PRIME * hfreq) - - (image_width * GTF_S_M_PRIME * 1000) + - (hfreq * (100 - GTF_S_C_PRIME) + GTF_S_M_PRIME * 1000) / 2) / - (hfreq * (100 - GTF_S_C_PRIME) + GTF_S_M_PRIME * 1000); - - h_blank = h_blank - h_blank % (2 * GTF_CELL_GRAN); - frame_width = image_width + h_blank; - - pix_clk = (image_width + h_blank) * hfreq; - pix_clk = pix_clk / GTF_PXL_CLK_GRAN * GTF_PXL_CLK_GRAN; - - hsync = (frame_width * 8 + 50) / 100; - hsync = hsync - hsync % GTF_CELL_GRAN; - - h_fp = h_blank / 2 - hsync; - - fmt->bt.polarities = polarities; - fmt->bt.width = image_width; - fmt->bt.height = image_height; - fmt->bt.hfrontporch = h_fp; - fmt->bt.vfrontporch = v_fp; - fmt->bt.hsync = hsync; - fmt->bt.vsync = vsync; - fmt->bt.hbackporch = frame_width - image_width - h_fp - hsync; - fmt->bt.vbackporch = frame_height - image_height - v_fp - vsync; - fmt->bt.pixelclock = pix_clk; - fmt->bt.standards = V4L2_DV_BT_STD_GTF; - if (!default_gtf) - fmt->bt.flags |= V4L2_DV_FL_REDUCED_BLANKING; - return true; -} -EXPORT_SYMBOL_GPL(v4l2_detect_gtf); - -/** v4l2_calc_aspect_ratio - calculate the aspect ratio based on bytes - * 0x15 and 0x16 from the EDID. - * @hor_landscape - byte 0x15 from the EDID. - * @vert_portrait - byte 0x16 from the EDID. - * - * Determines the aspect ratio from the EDID. - * See VESA Enhanced EDID standard, release A, rev 2, section 3.6.2: - * "Horizontal and Vertical Screen Size or Aspect Ratio" - */ -struct v4l2_fract v4l2_calc_aspect_ratio(u8 hor_landscape, u8 vert_portrait) -{ - struct v4l2_fract aspect = { 16, 9 }; - u32 tmp; - u8 ratio; - - /* Nothing filled in, fallback to 16:9 */ - if (!hor_landscape && !vert_portrait) - return aspect; - /* Both filled in, so they are interpreted as the screen size in cm */ - if (hor_landscape && vert_portrait) { - aspect.numerator = hor_landscape; - aspect.denominator = vert_portrait; - return aspect; - } - /* Only one is filled in, so interpret them as a ratio: - (val + 99) / 100 */ - ratio = hor_landscape | vert_portrait; - /* Change some rounded values into the exact aspect ratio */ - if (ratio == 79) { - aspect.numerator = 16; - aspect.denominator = 9; - } else if (ratio == 34) { - aspect.numerator = 4; - aspect.numerator = 3; - } else if (ratio == 68) { - aspect.numerator = 15; - aspect.numerator = 9; - } else { - aspect.numerator = hor_landscape + 99; - aspect.denominator = 100; - } - if (hor_landscape) - return aspect; - /* The aspect ratio is for portrait, so swap numerator and denominator */ - tmp = aspect.denominator; - aspect.denominator = aspect.numerator; - aspect.numerator = tmp; - return aspect; -} -EXPORT_SYMBOL_GPL(v4l2_calc_aspect_ratio); - const struct v4l2_frmsize_discrete *v4l2_find_nearest_format( const struct v4l2_discrete_probe *probe, s32 width, s32 height) diff --git a/drivers/media/v4l2-core/v4l2-dv-timings.c b/drivers/media/v4l2-core/v4l2-dv-timings.c index 5827946..f20b316 100644 --- a/drivers/media/v4l2-core/v4l2-dv-timings.c +++ b/drivers/media/v4l2-core/v4l2-dv-timings.c @@ -24,7 +24,6 @@ #include <linux/errno.h> #include <linux/videodev2.h> #include <linux/v4l2-dv-timings.h> -#include <media/v4l2-common.h> #include <media/v4l2-dv-timings.h> static const struct v4l2_dv_timings timings[] = { @@ -190,3 +189,360 @@ bool v4l2_find_dv_timings_cap(struct v4l2_dv_timings *t, return false; } EXPORT_SYMBOL_GPL(v4l2_find_dv_timings_cap); + +/** + * v4l_match_dv_timings - check if two timings match + * @t1 - compare this v4l2_dv_timings struct... + * @t2 - with this struct. + * @pclock_delta - the allowed pixelclock deviation. + * + * Compare t1 with t2 with a given margin of error for the pixelclock. + */ +bool v4l_match_dv_timings(const struct v4l2_dv_timings *t1, + const struct v4l2_dv_timings *t2, + unsigned pclock_delta) +{ + if (t1->type != t2->type || t1->type != V4L2_DV_BT_656_1120) + return false; + if (t1->bt.width == t2->bt.width && + t1->bt.height == t2->bt.height && + t1->bt.interlaced == t2->bt.interlaced && + t1->bt.polarities == t2->bt.polarities && + t1->bt.pixelclock >= t2->bt.pixelclock - pclock_delta && + t1->bt.pixelclock <= t2->bt.pixelclock + pclock_delta && + t1->bt.hfrontporch == t2->bt.hfrontporch && + t1->bt.vfrontporch == t2->bt.vfrontporch && + t1->bt.vsync == t2->bt.vsync && + t1->bt.vbackporch == t2->bt.vbackporch && + (!t1->bt.interlaced || + (t1->bt.il_vfrontporch == t2->bt.il_vfrontporch && + t1->bt.il_vsync == t2->bt.il_vsync && + t1->bt.il_vbackporch == t2->bt.il_vbackporch))) + return true; + return false; +} +EXPORT_SYMBOL_GPL(v4l_match_dv_timings); + +/* + * CVT defines + * Based on Coordinated Video Timings Standard + * version 1.1 September 10, 2003 + */ + +#define CVT_PXL_CLK_GRAN 250000 /* pixel clock granularity */ + +/* Normal blanking */ +#define CVT_MIN_V_BPORCH 7 /* lines */ +#define CVT_MIN_V_PORCH_RND 3 /* lines */ +#define CVT_MIN_VSYNC_BP 550 /* min time of vsync + back porch (us) */ + +/* Normal blanking for CVT uses GTF to calculate horizontal blanking */ +#define CVT_CELL_GRAN 8 /* character cell granularity */ +#define CVT_M 600 /* blanking formula gradient */ +#define CVT_C 40 /* blanking formula offset */ +#define CVT_K 128 /* blanking formula scaling factor */ +#define CVT_J 20 /* blanking formula scaling factor */ +#define CVT_C_PRIME (((CVT_C - CVT_J) * CVT_K / 256) + CVT_J) +#define CVT_M_PRIME (CVT_K * CVT_M / 256) + +/* Reduced Blanking */ +#define CVT_RB_MIN_V_BPORCH 7 /* lines */ +#define CVT_RB_V_FPORCH 3 /* lines */ +#define CVT_RB_MIN_V_BLANK 460 /* us */ +#define CVT_RB_H_SYNC 32 /* pixels */ +#define CVT_RB_H_BPORCH 80 /* pixels */ +#define CVT_RB_H_BLANK 160 /* pixels */ + +/** v4l2_detect_cvt - detect if the given timings follow the CVT standard + * @frame_height - the total height of the frame (including blanking) in lines. + * @hfreq - the horizontal frequency in Hz. + * @vsync - the height of the vertical sync in lines. + * @polarities - the horizontal and vertical polarities (same as struct + * v4l2_bt_timings polarities). + * @fmt - the resulting timings. + * + * This function will attempt to detect if the given values correspond to a + * valid CVT format. If so, then it will return true, and fmt will be filled + * in with the found CVT timings. + */ +bool v4l2_detect_cvt(unsigned frame_height, unsigned hfreq, unsigned vsync, + u32 polarities, struct v4l2_dv_timings *fmt) +{ + int v_fp, v_bp, h_fp, h_bp, hsync; + int frame_width, image_height, image_width; + bool reduced_blanking; + unsigned pix_clk; + + if (vsync < 4 || vsync > 7) + return false; + + if (polarities == V4L2_DV_VSYNC_POS_POL) + reduced_blanking = false; + else if (polarities == V4L2_DV_HSYNC_POS_POL) + reduced_blanking = true; + else + return false; + + /* Vertical */ + if (reduced_blanking) { + v_fp = CVT_RB_V_FPORCH; + v_bp = (CVT_RB_MIN_V_BLANK * hfreq + 999999) / 1000000; + v_bp -= vsync + v_fp; + + if (v_bp < CVT_RB_MIN_V_BPORCH) + v_bp = CVT_RB_MIN_V_BPORCH; + } else { + v_fp = CVT_MIN_V_PORCH_RND; + v_bp = (CVT_MIN_VSYNC_BP * hfreq + 999999) / 1000000 - vsync; + + if (v_bp < CVT_MIN_V_BPORCH) + v_bp = CVT_MIN_V_BPORCH; + } + image_height = (frame_height - v_fp - vsync - v_bp + 1) & ~0x1; + + /* Aspect ratio based on vsync */ + switch (vsync) { + case 4: + image_width = (image_height * 4) / 3; + break; + case 5: + image_width = (image_height * 16) / 9; + break; + case 6: + image_width = (image_height * 16) / 10; + break; + case 7: + /* special case */ + if (image_height == 1024) + image_width = (image_height * 5) / 4; + else if (image_height == 768) + image_width = (image_height * 15) / 9; + else + return false; + break; + default: + return false; + } + + image_width = image_width & ~7; + + /* Horizontal */ + if (reduced_blanking) { + pix_clk = (image_width + CVT_RB_H_BLANK) * hfreq; + pix_clk = (pix_clk / CVT_PXL_CLK_GRAN) * CVT_PXL_CLK_GRAN; + + h_bp = CVT_RB_H_BPORCH; + hsync = CVT_RB_H_SYNC; + h_fp = CVT_RB_H_BLANK - h_bp - hsync; + + frame_width = image_width + CVT_RB_H_BLANK; + } else { + int h_blank; + unsigned ideal_duty_cycle = CVT_C_PRIME - (CVT_M_PRIME * 1000) / hfreq; + + h_blank = (image_width * ideal_duty_cycle + (100 - ideal_duty_cycle) / 2) / + (100 - ideal_duty_cycle); + h_blank = h_blank - h_blank % (2 * CVT_CELL_GRAN); + + if (h_blank * 100 / image_width < 20) { + h_blank = image_width / 5; + h_blank = (h_blank + 0x7) & ~0x7; + } + + pix_clk = (image_width + h_blank) * hfreq; + pix_clk = (pix_clk / CVT_PXL_CLK_GRAN) * CVT_PXL_CLK_GRAN; + + h_bp = h_blank / 2; + frame_width = image_width + h_blank; + + hsync = (frame_width * 8 + 50) / 100; + hsync = hsync - hsync % CVT_CELL_GRAN; + h_fp = h_blank - hsync - h_bp; + } + + fmt->bt.polarities = polarities; + fmt->bt.width = image_width; + fmt->bt.height = image_height; + fmt->bt.hfrontporch = h_fp; + fmt->bt.vfrontporch = v_fp; + fmt->bt.hsync = hsync; + fmt->bt.vsync = vsync; + fmt->bt.hbackporch = frame_width - image_width - h_fp - hsync; + fmt->bt.vbackporch = frame_height - image_height - v_fp - vsync; + fmt->bt.pixelclock = pix_clk; + fmt->bt.standards = V4L2_DV_BT_STD_CVT; + if (reduced_blanking) + fmt->bt.flags |= V4L2_DV_FL_REDUCED_BLANKING; + return true; +} +EXPORT_SYMBOL_GPL(v4l2_detect_cvt); + +/* + * GTF defines + * Based on Generalized Timing Formula Standard + * Version 1.1 September 2, 1999 + */ + +#define GTF_PXL_CLK_GRAN 250000 /* pixel clock granularity */ + +#define GTF_MIN_VSYNC_BP 550 /* min time of vsync + back porch (us) */ +#define GTF_V_FP 1 /* vertical front porch (lines) */ +#define GTF_CELL_GRAN 8 /* character cell granularity */ + +/* Default */ +#define GTF_D_M 600 /* blanking formula gradient */ +#define GTF_D_C 40 /* blanking formula offset */ +#define GTF_D_K 128 /* blanking formula scaling factor */ +#define GTF_D_J 20 /* blanking formula scaling factor */ +#define GTF_D_C_PRIME ((((GTF_D_C - GTF_D_J) * GTF_D_K) / 256) + GTF_D_J) +#define GTF_D_M_PRIME ((GTF_D_K * GTF_D_M) / 256) + +/* Secondary */ +#define GTF_S_M 3600 /* blanking formula gradient */ +#define GTF_S_C 40 /* blanking formula offset */ +#define GTF_S_K 128 /* blanking formula scaling factor */ +#define GTF_S_J 35 /* blanking formula scaling factor */ +#define GTF_S_C_PRIME ((((GTF_S_C - GTF_S_J) * GTF_S_K) / 256) + GTF_S_J) +#define GTF_S_M_PRIME ((GTF_S_K * GTF_S_M) / 256) + +/** v4l2_detect_gtf - detect if the given timings follow the GTF standard + * @frame_height - the total height of the frame (including blanking) in lines. + * @hfreq - the horizontal frequency in Hz. + * @vsync - the height of the vertical sync in lines. + * @polarities - the horizontal and vertical polarities (same as struct + * v4l2_bt_timings polarities). + * @aspect - preferred aspect ratio. GTF has no method of determining the + * aspect ratio in order to derive the image width from the + * image height, so it has to be passed explicitly. Usually + * the native screen aspect ratio is used for this. If it + * is not filled in correctly, then 16:9 will be assumed. + * @fmt - the resulting timings. + * + * This function will attempt to detect if the given values correspond to a + * valid GTF format. If so, then it will return true, and fmt will be filled + * in with the found GTF timings. + */ +bool v4l2_detect_gtf(unsigned frame_height, + unsigned hfreq, + unsigned vsync, + u32 polarities, + struct v4l2_fract aspect, + struct v4l2_dv_timings *fmt) +{ + int pix_clk; + int v_fp, v_bp, h_fp, hsync; + int frame_width, image_height, image_width; + bool default_gtf; + int h_blank; + + if (vsync != 3) + return false; + + if (polarities == V4L2_DV_VSYNC_POS_POL) + default_gtf = true; + else if (polarities == V4L2_DV_HSYNC_POS_POL) + default_gtf = false; + else + return false; + + /* Vertical */ + v_fp = GTF_V_FP; + v_bp = (GTF_MIN_VSYNC_BP * hfreq + 999999) / 1000000 - vsync; + image_height = (frame_height - v_fp - vsync - v_bp + 1) & ~0x1; + + if (aspect.numerator == 0 || aspect.denominator == 0) { + aspect.numerator = 16; + aspect.denominator = 9; + } + image_width = ((image_height * aspect.numerator) / aspect.denominator); + + /* Horizontal */ + if (default_gtf) + h_blank = ((image_width * GTF_D_C_PRIME * hfreq) - + (image_width * GTF_D_M_PRIME * 1000) + + (hfreq * (100 - GTF_D_C_PRIME) + GTF_D_M_PRIME * 1000) / 2) / + (hfreq * (100 - GTF_D_C_PRIME) + GTF_D_M_PRIME * 1000); + else + h_blank = ((image_width * GTF_S_C_PRIME * hfreq) - + (image_width * GTF_S_M_PRIME * 1000) + + (hfreq * (100 - GTF_S_C_PRIME) + GTF_S_M_PRIME * 1000) / 2) / + (hfreq * (100 - GTF_S_C_PRIME) + GTF_S_M_PRIME * 1000); + + h_blank = h_blank - h_blank % (2 * GTF_CELL_GRAN); + frame_width = image_width + h_blank; + + pix_clk = (image_width + h_blank) * hfreq; + pix_clk = pix_clk / GTF_PXL_CLK_GRAN * GTF_PXL_CLK_GRAN; + + hsync = (frame_width * 8 + 50) / 100; + hsync = hsync - hsync % GTF_CELL_GRAN; + + h_fp = h_blank / 2 - hsync; + + fmt->bt.polarities = polarities; + fmt->bt.width = image_width; + fmt->bt.height = image_height; + fmt->bt.hfrontporch = h_fp; + fmt->bt.vfrontporch = v_fp; + fmt->bt.hsync = hsync; + fmt->bt.vsync = vsync; + fmt->bt.hbackporch = frame_width - image_width - h_fp - hsync; + fmt->bt.vbackporch = frame_height - image_height - v_fp - vsync; + fmt->bt.pixelclock = pix_clk; + fmt->bt.standards = V4L2_DV_BT_STD_GTF; + if (!default_gtf) + fmt->bt.flags |= V4L2_DV_FL_REDUCED_BLANKING; + return true; +} +EXPORT_SYMBOL_GPL(v4l2_detect_gtf); + +/** v4l2_calc_aspect_ratio - calculate the aspect ratio based on bytes + * 0x15 and 0x16 from the EDID. + * @hor_landscape - byte 0x15 from the EDID. + * @vert_portrait - byte 0x16 from the EDID. + * + * Determines the aspect ratio from the EDID. + * See VESA Enhanced EDID standard, release A, rev 2, section 3.6.2: + * "Horizontal and Vertical Screen Size or Aspect Ratio" + */ +struct v4l2_fract v4l2_calc_aspect_ratio(u8 hor_landscape, u8 vert_portrait) +{ + struct v4l2_fract aspect = { 16, 9 }; + u32 tmp; + u8 ratio; + + /* Nothing filled in, fallback to 16:9 */ + if (!hor_landscape && !vert_portrait) + return aspect; + /* Both filled in, so they are interpreted as the screen size in cm */ + if (hor_landscape && vert_portrait) { + aspect.numerator = hor_landscape; + aspect.denominator = vert_portrait; + return aspect; + } + /* Only one is filled in, so interpret them as a ratio: + (val + 99) / 100 */ + ratio = hor_landscape | vert_portrait; + /* Change some rounded values into the exact aspect ratio */ + if (ratio == 79) { + aspect.numerator = 16; + aspect.denominator = 9; + } else if (ratio == 34) { + aspect.numerator = 4; + aspect.numerator = 3; + } else if (ratio == 68) { + aspect.numerator = 15; + aspect.numerator = 9; + } else { + aspect.numerator = hor_landscape + 99; + aspect.denominator = 100; + } + if (hor_landscape) + return aspect; + /* The aspect ratio is for portrait, so swap numerator and denominator */ + tmp = aspect.denominator; + aspect.denominator = aspect.numerator; + aspect.numerator = tmp; + return aspect; +} +EXPORT_SYMBOL_GPL(v4l2_calc_aspect_ratio); |