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drm/edid: index CEA/HDMI mode tables using the VIC 

Add a dummy entry to CEA/HDMI mode tables so they can be indexed
directly using the VIC, avoiding a +1/-1 dance here and there. This adds
clarity to the error checking for various functions that return the VIC
on success and zero on failure; we can now explicitly check for 0
instead of just subtracting one from an unsigned type.

Also add drm_valid_cea_vic() and drm_valid_hdmi_vic() helpers for
checking valid VICs.

v2: add drm_valid_cea_vic and drm_valid_hdmi_vic helpers (Ville)
    use { } instead of { 0 } for initializing the dummy modes

Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1452252111-6439-1-git-send-email-jani.nikula@intel.com
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Jani Nikula 2016-01-08 13:21:51 +02:00 committed by Daniel Vetter
parent 14de6c44d1
commit d9278b4c2c
1 changed files with 53 additions and 41 deletions
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94
drivers/gpu/drm/drm_edid.c
View File

@ -637,8 +637,12 @@ static const struct minimode extra_modes[] = {
/*
* Probably taken from CEA-861 spec.
* This table is converted from xorg's hw/xfree86/modes/xf86EdidModes.c.
*
* Index using the VIC.
*/
static const struct drm_display_mode edid_cea_modes[] = {
/* 0 - dummy, VICs start at 1 */
{ },
/* 1 - 640x480@60Hz */
{ DRM_MODE("640x480", DRM_MODE_TYPE_DRIVER, 25175, 640, 656,
752, 800, 0, 480, 490, 492, 525, 0,
@ -987,9 +991,11 @@ static const struct drm_display_mode edid_cea_modes[] = {
};
/*
* HDMI 1.4 4k modes.
* HDMI 1.4 4k modes. Index using the VIC.
*/
static const struct drm_display_mode edid_4k_modes[] = {
/* 0 - dummy, VICs start at 1 */
{ },
/* 1 - 3840x2160@30Hz */
{ DRM_MODE("3840x2160", DRM_MODE_TYPE_DRIVER, 297000,
3840, 4016, 4104, 4400, 0,
@ -2548,13 +2554,13 @@ cea_mode_alternate_clock(const struct drm_display_mode *cea_mode)
static u8 drm_match_cea_mode_clock_tolerance(const struct drm_display_mode *to_match,
unsigned int clock_tolerance)
{
u8 mode;
u8 vic;
if (!to_match->clock)
return 0;
for (mode = 0; mode < ARRAY_SIZE(edid_cea_modes); mode++) {
const struct drm_display_mode *cea_mode = &edid_cea_modes[mode];
for (vic = 1; vic < ARRAY_SIZE(edid_cea_modes); vic++) {
const struct drm_display_mode *cea_mode = &edid_cea_modes[vic];
unsigned int clock1, clock2;
/* Check both 60Hz and 59.94Hz */
@ -2566,7 +2572,7 @@ static u8 drm_match_cea_mode_clock_tolerance(const struct drm_display_mode *to_m
continue;
if (drm_mode_equal_no_clocks(to_match, cea_mode))
return mode + 1;
return vic;
}
return 0;
@ -2581,13 +2587,13 @@ static u8 drm_match_cea_mode_clock_tolerance(const struct drm_display_mode *to_m
*/
u8 drm_match_cea_mode(const struct drm_display_mode *to_match)
{
u8 mode;
u8 vic;
if (!to_match->clock)
return 0;
for (mode = 0; mode < ARRAY_SIZE(edid_cea_modes); mode++) {
const struct drm_display_mode *cea_mode = &edid_cea_modes[mode];
for (vic = 1; vic < ARRAY_SIZE(edid_cea_modes); vic++) {
const struct drm_display_mode *cea_mode = &edid_cea_modes[vic];
unsigned int clock1, clock2;
/* Check both 60Hz and 59.94Hz */
@ -2597,12 +2603,17 @@ u8 drm_match_cea_mode(const struct drm_display_mode *to_match)
if ((KHZ2PICOS(to_match->clock) == KHZ2PICOS(clock1) ||
KHZ2PICOS(to_match->clock) == KHZ2PICOS(clock2)) &&
drm_mode_equal_no_clocks_no_stereo(to_match, cea_mode))
return mode + 1;
return vic;
}
return 0;
}
EXPORT_SYMBOL(drm_match_cea_mode);
static bool drm_valid_cea_vic(u8 vic)
{
return vic > 0 && vic < ARRAY_SIZE(edid_cea_modes);
}
/**
* drm_get_cea_aspect_ratio - get the picture aspect ratio corresponding to
* the input VIC from the CEA mode list
@ -2612,10 +2623,7 @@ EXPORT_SYMBOL(drm_match_cea_mode);
*/
enum hdmi_picture_aspect drm_get_cea_aspect_ratio(const u8 video_code)
{
/* return picture aspect ratio for video_code - 1 to access the
* right array element
*/
return edid_cea_modes[video_code-1].picture_aspect_ratio;
return edid_cea_modes[video_code].picture_aspect_ratio;
}
EXPORT_SYMBOL(drm_get_cea_aspect_ratio);
@ -2639,13 +2647,13 @@ hdmi_mode_alternate_clock(const struct drm_display_mode *hdmi_mode)
static u8 drm_match_hdmi_mode_clock_tolerance(const struct drm_display_mode *to_match,
unsigned int clock_tolerance)
{
u8 mode;
u8 vic;
if (!to_match->clock)
return 0;
for (mode = 0; mode < ARRAY_SIZE(edid_4k_modes); mode++) {
const struct drm_display_mode *hdmi_mode = &edid_4k_modes[mode];
for (vic = 1; vic < ARRAY_SIZE(edid_4k_modes); vic++) {
const struct drm_display_mode *hdmi_mode = &edid_4k_modes[vic];
unsigned int clock1, clock2;
/* Make sure to also match alternate clocks */
@ -2657,7 +2665,7 @@ static u8 drm_match_hdmi_mode_clock_tolerance(const struct drm_display_mode *to_
continue;
if (drm_mode_equal_no_clocks(to_match, hdmi_mode))
return mode + 1;
return vic;
}
return 0;
@ -2673,13 +2681,13 @@ static u8 drm_match_hdmi_mode_clock_tolerance(const struct drm_display_mode *to_
*/
static u8 drm_match_hdmi_mode(const struct drm_display_mode *to_match)
{
u8 mode;
u8 vic;
if (!to_match->clock)
return 0;
for (mode = 0; mode < ARRAY_SIZE(edid_4k_modes); mode++) {
const struct drm_display_mode *hdmi_mode = &edid_4k_modes[mode];
for (vic = 1; vic < ARRAY_SIZE(edid_4k_modes); vic++) {
const struct drm_display_mode *hdmi_mode = &edid_4k_modes[vic];
unsigned int clock1, clock2;
/* Make sure to also match alternate clocks */
@ -2689,11 +2697,16 @@ static u8 drm_match_hdmi_mode(const struct drm_display_mode *to_match)
if ((KHZ2PICOS(to_match->clock) == KHZ2PICOS(clock1) ||
KHZ2PICOS(to_match->clock) == KHZ2PICOS(clock2)) &&
drm_mode_equal_no_clocks_no_stereo(to_match, hdmi_mode))
return mode + 1;
return vic;
}
return 0;
}
static bool drm_valid_hdmi_vic(u8 vic)
{
return vic > 0 && vic < ARRAY_SIZE(edid_4k_modes);
}
static int
add_alternate_cea_modes(struct drm_connector *connector, struct edid *edid)
{
@ -2713,16 +2726,16 @@ add_alternate_cea_modes(struct drm_connector *connector, struct edid *edid)
list_for_each_entry(mode, &connector->probed_modes, head) {
const struct drm_display_mode *cea_mode = NULL;
struct drm_display_mode *newmode;
u8 mode_idx = drm_match_cea_mode(mode) - 1;
u8 vic = drm_match_cea_mode(mode);
unsigned int clock1, clock2;
if (mode_idx < ARRAY_SIZE(edid_cea_modes)) {
cea_mode = &edid_cea_modes[mode_idx];
if (drm_valid_cea_vic(vic)) {
cea_mode = &edid_cea_modes[vic];
clock2 = cea_mode_alternate_clock(cea_mode);
} else {
mode_idx = drm_match_hdmi_mode(mode) - 1;
if (mode_idx < ARRAY_SIZE(edid_4k_modes)) {
cea_mode = &edid_4k_modes[mode_idx];
vic = drm_match_hdmi_mode(mode);
if (drm_valid_hdmi_vic(vic)) {
cea_mode = &edid_4k_modes[vic];
clock2 = hdmi_mode_alternate_clock(cea_mode);
}
}
@ -2773,17 +2786,17 @@ drm_display_mode_from_vic_index(struct drm_connector *connector,
{
struct drm_device *dev = connector->dev;
struct drm_display_mode *newmode;
u8 cea_mode;
u8 vic;
if (video_db == NULL || video_index >= video_len)
return NULL;
/* CEA modes are numbered 1..127 */
cea_mode = (video_db[video_index] & 127) - 1;
if (cea_mode >= ARRAY_SIZE(edid_cea_modes))
vic = (video_db[video_index] & 127);
if (!drm_valid_cea_vic(vic))
return NULL;
newmode = drm_mode_duplicate(dev, &edid_cea_modes[cea_mode]);
newmode = drm_mode_duplicate(dev, &edid_cea_modes[vic]);
if (!newmode)
return NULL;
@ -2878,8 +2891,7 @@ static int add_hdmi_mode(struct drm_connector *connector, u8 vic)
struct drm_device *dev = connector->dev;
struct drm_display_mode *newmode;
vic--; /* VICs start at 1 */
if (vic >= ARRAY_SIZE(edid_4k_modes)) {
if (!drm_valid_hdmi_vic(vic)) {
DRM_ERROR("Unknown HDMI VIC: %d\n", vic);
return 0;
}
@ -3170,24 +3182,24 @@ static void fixup_detailed_cea_mode_clock(struct drm_display_mode *mode)
{
const struct drm_display_mode *cea_mode;
int clock1, clock2, clock;
u8 mode_idx;
u8 vic;
const char *type;
/*
* allow 5kHz clock difference either way to account for
* the 10kHz clock resolution limit of detailed timings.
*/
mode_idx = drm_match_cea_mode_clock_tolerance(mode, 5) - 1;
if (mode_idx < ARRAY_SIZE(edid_cea_modes)) {
vic = drm_match_cea_mode_clock_tolerance(mode, 5);
if (drm_valid_cea_vic(vic)) {
type = "CEA";
cea_mode = &edid_cea_modes[mode_idx];
cea_mode = &edid_cea_modes[vic];
clock1 = cea_mode->clock;
clock2 = cea_mode_alternate_clock(cea_mode);
} else {
mode_idx = drm_match_hdmi_mode_clock_tolerance(mode, 5) - 1;
if (mode_idx < ARRAY_SIZE(edid_4k_modes)) {
vic = drm_match_hdmi_mode_clock_tolerance(mode, 5);
if (drm_valid_hdmi_vic(vic)) {
type = "HDMI";
cea_mode = &edid_4k_modes[mode_idx];
cea_mode = &edid_4k_modes[vic];
clock1 = cea_mode->clock;
clock2 = hdmi_mode_alternate_clock(cea_mode);
} else {
@ -3205,7 +3217,7 @@ static void fixup_detailed_cea_mode_clock(struct drm_display_mode *mode)
return;
DRM_DEBUG("detailed mode matches %s VIC %d, adjusting clock %d -> %d\n",
type, mode_idx + 1, mode->clock, clock);
type, vic, mode->clock, clock);
mode->clock = clock;
}