On Wed, Dec 13, 2023 at 12:58:08PM +0200, Imre Deak wrote: > On Wed, Dec 13, 2023 at 11:31:24AM +0200, Ville Syrjälä wrote: > > On Wed, Dec 13, 2023 at 10:17:58AM +0200, Imre Deak wrote: > > > On Mon, Dec 11, 2023 at 11:37:49PM +0200, Ville Syrjala wrote: > > > > From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx> > > > > > > > > Unlike later platforms TGL has the half refresh rate (HRR) event > > > > on the main DMC (as opposed to the pipe DMC). Since we're disabling > > > > that event on all later platforms already let's do the same on > > > > TGL as well. > > > > > > > > There is supposedly a bit somewhere (DMC_CHICKEN on TGL) to make > > > > the handler not do anything, but we don't currently have code > > > > to frob it. Though that bit should be off by default, the ADL+ > > > > experience has shown us that trusting any of this isn't a good > > > > idea. So seems safer to just disable all event handlers we know > > > > that we don't need. > > > > > > > > Also the TGL DMC firmware is apparently using the wrong event > > > > (undelayed vblank) here anyway. It should be using the delayed > > > > vblank event instead (like ADL+ firmware does), but they didn't > > > > release a firmware fix for this and instead just hacked around > > > > this in the Windows driver code :/ > > > > > > > > Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx> > > > > --- > > > > drivers/gpu/drm/i915/display/intel_dmc.c | 5 +++++ > > > > drivers/gpu/drm/i915/display/intel_dmc_regs.h | 1 + > > > > 2 files changed, 6 insertions(+) > > > > > > > > diff --git a/drivers/gpu/drm/i915/display/intel_dmc.c b/drivers/gpu/drm/i915/display/intel_dmc.c > > > > index 9385898e3aa5..0722d322ec63 100644 > > > > --- a/drivers/gpu/drm/i915/display/intel_dmc.c > > > > +++ b/drivers/gpu/drm/i915/display/intel_dmc.c > > > > @@ -448,6 +448,11 @@ static bool disable_dmc_evt(struct drm_i915_private *i915, > > > > REG_FIELD_GET(DMC_EVT_CTL_EVENT_ID_MASK, data) == DMC_EVT_CTL_EVENT_ID_CLK_MSEC) > > > > return true; > > > > > > > > + /* also disable the HRR event on the main DMC on TGL */ > > > > + if (IS_TIGERLAKE(i915) && > > > > + REG_FIELD_GET(DMC_EVT_CTL_EVENT_ID_MASK, data) == DMC_EVT_CTL_EVENT_ID_VBLANK_A) > > > > > > The adls FW has the same event (but not the MSEC flip-queue one for some > > > reason). > > > > I can't see it in the binary. Though I am using hexdump so it might > > also be that I'm looking in the wrong place :P > > I see > dmc-dump -p 0 -i ~/Downloads/adls_dmc_ver2_01.bin > > CSS module > ================================= > Module type : 9 > Module header len : 128 bytes > Module header version : 1.0 > Module id : 0x00000000 > Module vendor : 0x00000000 > Module build date : 2020/05/26 > Module size : 18704 bytes > Module key size : 0 > Module modulus size : 0 > Module exponent size : 0 > Module version : 2.1 > Module kernel header : 0x0 > > Package > =================================== > Package header len : 400 bytes > Package header version : 2 > Package payload entries: 2 > > Payload#0 > ----------------------------------- > Payload type : main > Payload CPU stepping : * > Payload CPU substepping: * > Payload file offset : 528 > ----------------------------------- > FW signature : 0x40403e3e > FW header len : 256 bytes > FW header version : 3 > FW DMC HW version : 12.2 > FW Project : 0x0c00 > FW program size : 16784 bytes > FW program area : 0x080000 - 0x08418f > FW file offset : 784 > FW source version : 0.1 > FW fix MMIO count : 7 > FW fix MMIOs : > [8f074]=00086fc0 > [8f034]=c003b400 > [8f004]=01a40188 > [8f038]=c003b200 > [8f008]=3dc43bf4 > [8f03c]=c0033200 > [8f00c]=40b8408c Hmm, yeah I see that now with hexdump as well. I think I was accidentally looking at rkl firmware previously. Dunno how I managed to mistyle "adls" as "rkl" though. Oh well, I'll respin with an adls check added. > FW source file name : d12adls_fw_main_0.1.d\x00-device\x00D1 > > > > > > > > > > + return true; > > > > + > > > > return false; > > > > } > > > > > > > > diff --git a/drivers/gpu/drm/i915/display/intel_dmc_regs.h b/drivers/gpu/drm/i915/display/intel_dmc_regs.h > > > > index cf10094acae3..90d0dbb41cfe 100644 > > > > --- a/drivers/gpu/drm/i915/display/intel_dmc_regs.h > > > > +++ b/drivers/gpu/drm/i915/display/intel_dmc_regs.h > > > > @@ -60,6 +60,7 @@ > > > > > > > > #define DMC_EVT_CTL_EVENT_ID_MASK REG_GENMASK(15, 8) > > > > #define DMC_EVT_CTL_EVENT_ID_FALSE 0x01 > > > > +#define DMC_EVT_CTL_EVENT_ID_VBLANK_A 0x32 /* main DMC */ > > > > /* An event handler scheduled to run at a 1 kHz frequency. */ > > > > #define DMC_EVT_CTL_EVENT_ID_CLK_MSEC 0xbf > > > > > > > > -- > > > > 2.41.0 > > > > > > > > -- > > Ville Syrjälä > > Intel -- Ville Syrjälä Intel
