Add a video_edid_dtd_to_ctfb_res_modes helper function to convert an EDID detailed timing to a struct ctfb_res_modes.
Signed-off-by: Hans de Goede hdegoede@redhat.com --- drivers/video/videomodes.c | 73 ++++++++++++++++++++++++++++++++++++++++++++++ drivers/video/videomodes.h | 4 +++ include/edid.h | 4 +++ 3 files changed, 81 insertions(+)
diff --git a/drivers/video/videomodes.c b/drivers/video/videomodes.c index 1f79d5f..9a4f0af 100644 --- a/drivers/video/videomodes.c +++ b/drivers/video/videomodes.c @@ -58,6 +58,8 @@ ****************************************************************************/
#include <common.h> +#include <edid.h> +#include <errno.h> #include <linux/ctype.h>
#include "videomodes.h" @@ -371,3 +373,74 @@ int video_get_option_int(const char *options, const char *name, int def) } return def; } + +/** + * Convert an EDID detailed timing to a struct ctfb_res_modes + * + * @param t The EDID detailed timing to be converted + * @param mode Returns the converted timing + * + * @return 0 on success, or a negative errno on error + */ +int video_edid_dtd_to_ctfb_res_modes(struct edid_detailed_timing *t, + struct ctfb_res_modes *mode) +{ + int margin, h_total, v_total; + + /* Check all timings are non 0 */ + if (EDID_DETAILED_TIMING_PIXEL_CLOCK(*t) == 0 || + EDID_DETAILED_TIMING_HORIZONTAL_ACTIVE(*t) == 0 || + EDID_DETAILED_TIMING_HORIZONTAL_BLANKING(*t) == 0 || + EDID_DETAILED_TIMING_VERTICAL_ACTIVE(*t) == 0 || + EDID_DETAILED_TIMING_VERTICAL_BLANKING(*t) == 0 || + EDID_DETAILED_TIMING_HSYNC_OFFSET(*t) == 0 || + EDID_DETAILED_TIMING_HSYNC_PULSE_WIDTH(*t) == 0 || + EDID_DETAILED_TIMING_VSYNC_OFFSET(*t) == 0 || + EDID_DETAILED_TIMING_VSYNC_PULSE_WIDTH(*t) == 0 || + /* 3d formats are not supported*/ + EDID_DETAILED_TIMING_FLAG_STEREO(*t) != 0) + return -EINVAL; + + mode->xres = EDID_DETAILED_TIMING_HORIZONTAL_ACTIVE(*t); + mode->yres = EDID_DETAILED_TIMING_VERTICAL_ACTIVE(*t); + + h_total = mode->xres + EDID_DETAILED_TIMING_HORIZONTAL_BLANKING(*t); + v_total = mode->yres + EDID_DETAILED_TIMING_VERTICAL_BLANKING(*t); + mode->refresh = EDID_DETAILED_TIMING_PIXEL_CLOCK(*t) / + (h_total * v_total); + + mode->pixclock = 1000000000000LL / EDID_DETAILED_TIMING_PIXEL_CLOCK(*t); + mode->pixclock_khz = (EDID_DETAILED_TIMING_PIXEL_CLOCK(*t) + 500) / + 1000; + + mode->right_margin = EDID_DETAILED_TIMING_HSYNC_OFFSET(*t); + mode->hsync_len = EDID_DETAILED_TIMING_HSYNC_PULSE_WIDTH(*t); + margin = EDID_DETAILED_TIMING_HORIZONTAL_BLANKING(*t) - + (mode->right_margin + mode->hsync_len); + if (margin <= 0) + return -EINVAL; + + mode->left_margin = margin; + + mode->lower_margin = EDID_DETAILED_TIMING_VSYNC_OFFSET(*t); + mode->vsync_len = EDID_DETAILED_TIMING_VSYNC_PULSE_WIDTH(*t); + margin = EDID_DETAILED_TIMING_VERTICAL_BLANKING(*t) - + (mode->lower_margin + mode->vsync_len); + if (margin <= 0) + return -EINVAL; + + mode->upper_margin = margin; + + mode->sync = 0; + if (EDID_DETAILED_TIMING_FLAG_HSYNC_POLARITY(*t)) + mode->sync |= FB_SYNC_HOR_HIGH_ACT; + if (EDID_DETAILED_TIMING_FLAG_VSYNC_POLARITY(*t)) + mode->sync |= FB_SYNC_VERT_HIGH_ACT; + + if (EDID_DETAILED_TIMING_FLAG_INTERLACED(*t)) + mode->vmode = FB_VMODE_INTERLACED; + else + mode->vmode = FB_VMODE_NONINTERLACED; + + return 0; +} diff --git a/drivers/video/videomodes.h b/drivers/video/videomodes.h index 047b8a9..82190a2 100644 --- a/drivers/video/videomodes.h +++ b/drivers/video/videomodes.h @@ -5,6 +5,7 @@ * SPDX-License-Identifier: GPL-2.0+ */
+#include <edid.h>
#ifndef CONFIG_SYS_DEFAULT_VIDEO_MODE #define CONFIG_SYS_DEFAULT_VIDEO_MODE 0x301 @@ -89,3 +90,6 @@ void video_get_option_string(const char *options, const char *name, char *dest, int dest_len, const char *def);
int video_get_option_int(const char *options, const char *name, int def); + +int video_edid_dtd_to_ctfb_res_modes(struct edid_detailed_timing *t, + struct ctfb_res_modes *mode); diff --git a/include/edid.h b/include/edid.h index 480a773..d3cc523 100644 --- a/include/edid.h +++ b/include/edid.h @@ -86,6 +86,10 @@ struct edid_detailed_timing { GET_BITS((_x).flags, 4, 3) #define EDID_DETAILED_TIMING_FLAG_POLARITY(_x) \ GET_BITS((_x).flags, 2, 1) +#define EDID_DETAILED_TIMING_FLAG_VSYNC_POLARITY(_x) \ + GET_BIT((_x).flags, 2) +#define EDID_DETAILED_TIMING_FLAG_HSYNC_POLARITY(_x) \ + GET_BIT((_x).flags, 1) #define EDID_DETAILED_TIMING_FLAG_INTERLEAVED(_x) \ GET_BIT((_x).flags, 0) } __attribute__ ((__packed__));