提交 1518dd8e 编写于 作者: A Alex Deucher

drm/radeon: fix audio dto calculation on DCE3+ (v3)

Need to set the wallclock ratio and adjust the phase
and module registers appropriately.  May fix problems
with audio timing at certain display timings.

v2: properly handle clocks below 24mhz
v3: rebase r600 changes
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>
上级 ce149a94
......@@ -148,18 +148,40 @@ static void evergreen_audio_set_dto(struct drm_encoder *encoder, u32 clock)
struct radeon_encoder_atom_dig *dig = radeon_encoder->enc_priv;
struct radeon_crtc *radeon_crtc = to_radeon_crtc(encoder->crtc);
u32 base_rate = 24000;
u32 max_ratio = clock / base_rate;
u32 dto_phase;
u32 dto_modulo = clock;
u32 wallclock_ratio;
u32 dto_cntl;
if (!dig || !dig->afmt)
return;
if (max_ratio >= 8) {
dto_phase = 192 * 1000;
wallclock_ratio = 3;
} else if (max_ratio >= 4) {
dto_phase = 96 * 1000;
wallclock_ratio = 2;
} else if (max_ratio >= 2) {
dto_phase = 48 * 1000;
wallclock_ratio = 1;
} else {
dto_phase = 24 * 1000;
wallclock_ratio = 0;
}
dto_cntl = RREG32(DCCG_AUDIO_DTO0_CNTL) & ~DCCG_AUDIO_DTO_WALLCLOCK_RATIO_MASK;
dto_cntl |= DCCG_AUDIO_DTO_WALLCLOCK_RATIO(wallclock_ratio);
WREG32(DCCG_AUDIO_DTO0_CNTL, dto_cntl);
/* XXX two dtos; generally use dto0 for hdmi */
/* Express [24MHz / target pixel clock] as an exact rational
* number (coefficient of two integer numbers. DCCG_AUDIO_DTOx_PHASE
* is the numerator, DCCG_AUDIO_DTOx_MODULE is the denominator
*/
WREG32(DCCG_AUDIO_DTO_SOURCE, DCCG_AUDIO_DTO0_SOURCE_SEL(radeon_crtc->crtc_id));
WREG32(DCCG_AUDIO_DTO0_PHASE, base_rate * 100);
WREG32(DCCG_AUDIO_DTO0_MODULE, clock * 100);
WREG32(DCCG_AUDIO_DTO0_PHASE, dto_phase);
WREG32(DCCG_AUDIO_DTO0_MODULE, dto_modulo);
}
......
......@@ -497,6 +497,9 @@
#define DCCG_AUDIO_DTO0_MODULE 0x05b4
#define DCCG_AUDIO_DTO0_LOAD 0x05b8
#define DCCG_AUDIO_DTO0_CNTL 0x05bc
# define DCCG_AUDIO_DTO_WALLCLOCK_RATIO(x) (((x) & 7) << 0)
# define DCCG_AUDIO_DTO_WALLCLOCK_RATIO_MASK 7
# define DCCG_AUDIO_DTO_WALLCLOCK_RATIO_SHIFT 0
#define DCCG_AUDIO_DTO1_PHASE 0x05c0
#define DCCG_AUDIO_DTO1_MODULE 0x05c4
......
......@@ -226,10 +226,29 @@ void r600_audio_set_dto(struct drm_encoder *encoder, u32 clock)
struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);
struct radeon_encoder_atom_dig *dig = radeon_encoder->enc_priv;
u32 base_rate = 24000;
u32 max_ratio = clock / base_rate;
u32 dto_phase;
u32 dto_modulo = clock;
u32 wallclock_ratio;
u32 dto_cntl;
if (!dig || !dig->afmt)
return;
if (max_ratio >= 8) {
dto_phase = 192 * 1000;
wallclock_ratio = 3;
} else if (max_ratio >= 4) {
dto_phase = 96 * 1000;
wallclock_ratio = 2;
} else if (max_ratio >= 2) {
dto_phase = 48 * 1000;
wallclock_ratio = 1;
} else {
dto_phase = 24 * 1000;
wallclock_ratio = 0;
}
/* there are two DTOs selected by DCCG_AUDIO_DTO_SELECT.
* doesn't matter which one you use. Just use the first one.
*/
......@@ -243,12 +262,18 @@ void r600_audio_set_dto(struct drm_encoder *encoder, u32 clock)
* practice it seems to cover DCE3.0 as well.
*/
if (dig->dig_encoder == 0) {
WREG32(DCCG_AUDIO_DTO0_PHASE, base_rate * 100);
WREG32(DCCG_AUDIO_DTO0_MODULE, clock * 100);
dto_cntl = RREG32(DCCG_AUDIO_DTO0_CNTL) & ~DCCG_AUDIO_DTO_WALLCLOCK_RATIO_MASK;
dto_cntl |= DCCG_AUDIO_DTO_WALLCLOCK_RATIO(wallclock_ratio);
WREG32(DCCG_AUDIO_DTO0_CNTL, dto_cntl);
WREG32(DCCG_AUDIO_DTO0_PHASE, dto_phase);
WREG32(DCCG_AUDIO_DTO0_MODULE, dto_modulo);
WREG32(DCCG_AUDIO_DTO_SELECT, 0); /* select DTO0 */
} else {
WREG32(DCCG_AUDIO_DTO1_PHASE, base_rate * 100);
WREG32(DCCG_AUDIO_DTO1_MODULE, clock * 100);
dto_cntl = RREG32(DCCG_AUDIO_DTO1_CNTL) & ~DCCG_AUDIO_DTO_WALLCLOCK_RATIO_MASK;
dto_cntl |= DCCG_AUDIO_DTO_WALLCLOCK_RATIO(wallclock_ratio);
WREG32(DCCG_AUDIO_DTO1_CNTL, dto_cntl);
WREG32(DCCG_AUDIO_DTO1_PHASE, dto_phase);
WREG32(DCCG_AUDIO_DTO1_MODULE, dto_modulo);
WREG32(DCCG_AUDIO_DTO_SELECT, 1); /* select DTO1 */
}
} else {
......
......@@ -933,6 +933,9 @@
#define DCCG_AUDIO_DTO0_LOAD 0x051c
# define DTO_LOAD (1 << 31)
#define DCCG_AUDIO_DTO0_CNTL 0x0520
# define DCCG_AUDIO_DTO_WALLCLOCK_RATIO(x) (((x) & 7) << 0)
# define DCCG_AUDIO_DTO_WALLCLOCK_RATIO_MASK 7
# define DCCG_AUDIO_DTO_WALLCLOCK_RATIO_SHIFT 0
#define DCCG_AUDIO_DTO1_PHASE 0x0524
#define DCCG_AUDIO_DTO1_MODULE 0x0528
......
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