This is a note to let you know that I've just added the patch titled
drm/radeon: Fix "slow" audio over DP on DCE8+
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-radeon-fix-slow-audio-over-dp-on-dce8.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From ac4a9350abddc51ccb897abf0d9f3fd592b97e0b Mon Sep 17 00:00:00 2001
From: Slava Grigorev <slava.grigorev@xxxxxxx>
Date: Thu, 17 Dec 2015 11:09:58 -0500
Subject: drm/radeon: Fix "slow" audio over DP on DCE8+
From: Slava Grigorev <slava.grigorev@xxxxxxx>
commit ac4a9350abddc51ccb897abf0d9f3fd592b97e0b upstream.
DP audio is derived from the dfs clock.
Signed-off-by: Slava Grigorev <slava.grigorev@xxxxxxx>
Reviewed-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/radeon/dce6_afmt.c | 16 ++++++++++++++++
drivers/gpu/drm/radeon/radeon.h | 1 +
drivers/gpu/drm/radeon/radeon_atombios.c | 7 +++++++
drivers/gpu/drm/radeon/sid.h | 5 +++++
4 files changed, 29 insertions(+)
--- a/drivers/gpu/drm/radeon/dce6_afmt.c
+++ b/drivers/gpu/drm/radeon/dce6_afmt.c
@@ -301,6 +301,22 @@ void dce6_dp_audio_set_dto(struct radeon
* is the numerator, DCCG_AUDIO_DTOx_MODULE is the denominator
*/
if (ASIC_IS_DCE8(rdev)) {
+ unsigned int div = (RREG32(DENTIST_DISPCLK_CNTL) &
+ DENTIST_DPREFCLK_WDIVIDER_MASK) >>
+ DENTIST_DPREFCLK_WDIVIDER_SHIFT;
+
+ if (div < 128 && div >= 96)
+ div -= 64;
+ else if (div >= 64)
+ div = div / 2 - 16;
+ else if (div >= 8)
+ div /= 4;
+ else
+ div = 0;
+
+ if (div)
+ clock = rdev->clock.gpupll_outputfreq * 10 / div;
+
WREG32(DCE8_DCCG_AUDIO_DTO1_PHASE, 24000);
WREG32(DCE8_DCCG_AUDIO_DTO1_MODULE, clock);
} else {
--- a/drivers/gpu/drm/radeon/radeon.h
+++ b/drivers/gpu/drm/radeon/radeon.h
@@ -268,6 +268,7 @@ struct radeon_clock {
uint32_t current_dispclk;
uint32_t dp_extclk;
uint32_t max_pixel_clock;
+ uint32_t gpupll_outputfreq;
};
/*
--- a/drivers/gpu/drm/radeon/radeon_atombios.c
+++ b/drivers/gpu/drm/radeon/radeon_atombios.c
@@ -1263,6 +1263,13 @@ bool radeon_atom_get_clock_info(struct d
rdev->mode_info.firmware_flags =
le16_to_cpu(firmware_info->info.usFirmwareCapability.susAccess);
+ if (ASIC_IS_DCE8(rdev)) {
+ rdev->clock.gpupll_outputfreq =
+ le32_to_cpu(firmware_info->info_22.ulGPUPLL_OutputFreq);
+ if (rdev->clock.gpupll_outputfreq == 0)
+ rdev->clock.gpupll_outputfreq = 360000; /* 3.6 GHz */
+ }
+
return true;
}
--- a/drivers/gpu/drm/radeon/sid.h
+++ b/drivers/gpu/drm/radeon/sid.h
@@ -915,6 +915,11 @@
#define DCCG_AUDIO_DTO1_PHASE 0x05c0
#define DCCG_AUDIO_DTO1_MODULE 0x05c4
+#define DENTIST_DISPCLK_CNTL 0x0490
+# define DENTIST_DPREFCLK_WDIVIDER(x) (((x) & 0x7f) << 24)
+# define DENTIST_DPREFCLK_WDIVIDER_MASK (0x7f << 24)
+# define DENTIST_DPREFCLK_WDIVIDER_SHIFT 24
+
#define AFMT_AUDIO_SRC_CONTROL 0x713c
#define AFMT_AUDIO_SRC_SELECT(x) (((x) & 7) << 0)
/* AFMT_AUDIO_SRC_SELECT
Patches currently in stable-queue which might be from slava.grigorev@xxxxxxx are
queue-4.4/drm-radeon-fix-dp-audio-support-for-apu-with-dce4.1-display-engine.patch
queue-4.4/drm-radeon-cleaned-up-vco-output-settings-for-dp-audio.patch
queue-4.4/drm-radeon-fix-slow-audio-over-dp-on-dce8.patch
queue-4.4/drm-radeon-add-a-common-function-for-dfs-handling.patch
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