[Intel-gfx] [PATCH 5/9] drm/i915/mtl: MTL PICA hotplug detection
Jani Nikula
jani.nikula at linux.intel.com
Tue Aug 8 14:52:39 UTC 2023
On Thu, 13 Apr 2023, Radhakrishna Sripada <radhakrishna.sripada at intel.com> wrote:
> From: Mika Kahola <mika.kahola at intel.com>
>
> PICA is used for DP alt mode and TBT modes. Hotplug interruption is routed
> from PICA chip to south display engine and from there to north display
> engine. This patch adds functionality to enable hotplug detection for
> all Type-C ports (4 ports available).
>
> Differently from HPD in south display, PICA provides a dedicated HPD
> control register for each supported port, so we loop over ports
> ourselves instead of using intel_hpd_hotplug_enables() or
> intel_get_hpd_pins().
See inline for a question about this patch, i.e. commit babde06db885
("drm/i915/mtl: MTL PICA hotplug detection").
> BSpec: 49305, 55726, 65107, 65300
>
> Reviewed-by: Imre Deak <imre.deak at intel.com>
> Signed-off-by: Madhumitha Tolakanahalli Pradeep <madhumitha.tolakanahalli.pradeep at intel.com>
> Signed-off-by: Gustavo Sousa <gustavo.sousa at intel.com>
> Signed-off-by: Radhakrishna Sripada <radhakrishna.sripada at intel.com>
> Signed-off-by: Mika Kahola <mika.kahola at intel.com>
> ---
> drivers/gpu/drm/i915/i915_irq.c | 237 +++++++++++++++++++++++++++++++-
> drivers/gpu/drm/i915/i915_reg.h | 31 ++++-
> 2 files changed, 261 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
> index d24bdea65a3d..b4dd6a5a536f 100644
> --- a/drivers/gpu/drm/i915/i915_irq.c
> +++ b/drivers/gpu/drm/i915/i915_irq.c
> @@ -162,6 +162,13 @@ static const u32 hpd_gen11[HPD_NUM_PINS] = {
> [HPD_PORT_TC6] = GEN11_TC_HOTPLUG(HPD_PORT_TC6) | GEN11_TBT_HOTPLUG(HPD_PORT_TC6),
> };
>
> +static const u32 hpd_xelpdp[HPD_NUM_PINS] = {
> + [HPD_PORT_TC1] = XELPDP_TBT_HOTPLUG(HPD_PORT_TC1) | XELPDP_DP_ALT_HOTPLUG(HPD_PORT_TC1),
> + [HPD_PORT_TC2] = XELPDP_TBT_HOTPLUG(HPD_PORT_TC2) | XELPDP_DP_ALT_HOTPLUG(HPD_PORT_TC2),
> + [HPD_PORT_TC3] = XELPDP_TBT_HOTPLUG(HPD_PORT_TC3) | XELPDP_DP_ALT_HOTPLUG(HPD_PORT_TC3),
> + [HPD_PORT_TC4] = XELPDP_TBT_HOTPLUG(HPD_PORT_TC4) | XELPDP_DP_ALT_HOTPLUG(HPD_PORT_TC4),
> +};
> +
> static const u32 hpd_icp[HPD_NUM_PINS] = {
> [HPD_PORT_A] = SDE_DDI_HOTPLUG_ICP(HPD_PORT_A),
> [HPD_PORT_B] = SDE_DDI_HOTPLUG_ICP(HPD_PORT_B),
> @@ -182,6 +189,15 @@ static const u32 hpd_sde_dg1[HPD_NUM_PINS] = {
> [HPD_PORT_TC1] = SDE_TC_HOTPLUG_DG2(HPD_PORT_TC1),
> };
>
> +static const u32 hpd_mtp[HPD_NUM_PINS] = {
> + [HPD_PORT_A] = SDE_DDI_HOTPLUG_ICP(HPD_PORT_A),
> + [HPD_PORT_B] = SDE_DDI_HOTPLUG_ICP(HPD_PORT_B),
> + [HPD_PORT_TC1] = SDE_TC_HOTPLUG_ICP(HPD_PORT_TC1),
> + [HPD_PORT_TC2] = SDE_TC_HOTPLUG_ICP(HPD_PORT_TC2),
> + [HPD_PORT_TC3] = SDE_TC_HOTPLUG_ICP(HPD_PORT_TC3),
> + [HPD_PORT_TC4] = SDE_TC_HOTPLUG_ICP(HPD_PORT_TC4),
> +};
> +
> static void intel_hpd_init_pins(struct drm_i915_private *dev_priv)
> {
> struct intel_hotplug *hpd = &dev_priv->display.hotplug;
> @@ -195,7 +211,9 @@ static void intel_hpd_init_pins(struct drm_i915_private *dev_priv)
> return;
> }
>
> - if (DISPLAY_VER(dev_priv) >= 11)
> + if (DISPLAY_VER(dev_priv) >= 14)
> + hpd->hpd = hpd_xelpdp;
> + else if (DISPLAY_VER(dev_priv) >= 11)
> hpd->hpd = hpd_gen11;
> else if (IS_GEMINILAKE(dev_priv) || IS_BROXTON(dev_priv))
> hpd->hpd = hpd_bxt;
> @@ -214,6 +232,8 @@ static void intel_hpd_init_pins(struct drm_i915_private *dev_priv)
>
> if (INTEL_PCH_TYPE(dev_priv) >= PCH_DG1)
> hpd->pch_hpd = hpd_sde_dg1;
> + else if (INTEL_PCH_TYPE(dev_priv) >= PCH_MTP)
> + hpd->pch_hpd = hpd_mtp;
> else if (INTEL_PCH_TYPE(dev_priv) >= PCH_ICP)
> hpd->pch_hpd = hpd_icp;
> else if (HAS_PCH_CNP(dev_priv) || HAS_PCH_SPT(dev_priv))
> @@ -1559,6 +1579,44 @@ static void cpt_irq_handler(struct drm_i915_private *dev_priv, u32 pch_iir)
> cpt_serr_int_handler(dev_priv);
> }
>
> +static void xelpdp_pica_irq_handler(struct drm_i915_private *i915, u32 iir)
> +{
> + enum hpd_pin pin;
> + u32 hotplug_trigger = iir & (XELPDP_DP_ALT_HOTPLUG_MASK | XELPDP_TBT_HOTPLUG_MASK);
> + u32 trigger_aux = iir & XELPDP_AUX_TC_MASK;
> + u32 pin_mask = 0, long_mask = 0;
> +
> + for (pin = HPD_PORT_TC1; pin <= HPD_PORT_TC4; pin++) {
> + u32 val;
> +
> + if (!(i915->display.hotplug.hpd[pin] & hotplug_trigger))
> + continue;
> +
> + pin_mask |= BIT(pin);
> +
> + val = intel_de_read(i915, XELPDP_PORT_HOTPLUG_CTL(pin));
> + intel_de_write(i915, XELPDP_PORT_HOTPLUG_CTL(pin), val);
> +
> + if (val & (XELPDP_DP_ALT_HPD_LONG_DETECT | XELPDP_TBT_HPD_LONG_DETECT))
> + long_mask |= BIT(pin);
> + }
> +
> + if (pin_mask) {
> + drm_dbg(&i915->drm,
> + "pica hotplug event received, stat 0x%08x, pins 0x%08x, long 0x%08x\n",
> + hotplug_trigger, pin_mask, long_mask);
> +
> + intel_hpd_irq_handler(i915, pin_mask, long_mask);
> + }
> +
> + if (trigger_aux)
> + dp_aux_irq_handler(i915);
> +
> + if (!pin_mask && !trigger_aux)
> + drm_err(&i915->drm,
> + "Unexpected DE HPD/AUX interrupt 0x%08x\n", iir);
> +}
> +
> static void icp_irq_handler(struct drm_i915_private *dev_priv, u32 pch_iir)
> {
> u32 ddi_hotplug_trigger = pch_iir & SDE_DDI_HOTPLUG_MASK_ICP;
> @@ -2029,6 +2087,34 @@ u32 gen8_de_pipe_underrun_mask(struct drm_i915_private *dev_priv)
> return mask;
> }
>
> +static void gen8_read_and_ack_pch_irqs(struct drm_i915_private *i915, u32 *pch_iir, u32 *pica_iir)
> +{
> + u32 pica_ier = 0;
> +
> + *pica_iir = 0;
> + *pch_iir = intel_de_read(i915, SDEIIR);
> + if (!*pch_iir)
> + return;
> +
> + /**
> + * PICA IER must be disabled/re-enabled around clearing PICA IIR and
> + * SDEIIR, to avoid losing PICA IRQs and to ensure that such IRQs set
> + * their flags both in the PICA and SDE IIR.
> + */
> + if (*pch_iir & SDE_PICAINTERRUPT) {
> + drm_WARN_ON(&i915->drm, INTEL_PCH_TYPE(i915) < PCH_MTP);
> +
> + pica_ier = intel_de_rmw(i915, PICAINTERRUPT_IER, ~0, 0);
> + *pica_iir = intel_de_read(i915, PICAINTERRUPT_IIR);
> + intel_de_write(i915, PICAINTERRUPT_IIR, *pica_iir);
> + }
> +
> + intel_de_write(i915, SDEIIR, *pch_iir);
> +
> + if (pica_ier)
> + intel_de_write(i915, PICAINTERRUPT_IER, pica_ier);
> +}
> +
> static irqreturn_t
> gen8_de_irq_handler(struct drm_i915_private *dev_priv, u32 master_ctl)
> {
> @@ -2153,16 +2239,20 @@ gen8_de_irq_handler(struct drm_i915_private *dev_priv, u32 master_ctl)
>
> if (HAS_PCH_SPLIT(dev_priv) && !HAS_PCH_NOP(dev_priv) &&
> master_ctl & GEN8_DE_PCH_IRQ) {
> + u32 pica_iir;
> +
> /*
> * FIXME(BDW): Assume for now that the new interrupt handling
> * scheme also closed the SDE interrupt handling race we've seen
> * on older pch-split platforms. But this needs testing.
> */
> - iir = intel_uncore_read(&dev_priv->uncore, SDEIIR);
> + gen8_read_and_ack_pch_irqs(dev_priv, &iir, &pica_iir);
> if (iir) {
> - intel_uncore_write(&dev_priv->uncore, SDEIIR, iir);
> ret = IRQ_HANDLED;
>
> + if (pica_iir)
> + xelpdp_pica_irq_handler(dev_priv, pica_iir);
> +
> if (INTEL_PCH_TYPE(dev_priv) >= PCH_ICP)
> icp_irq_handler(dev_priv, iir);
> else if (INTEL_PCH_TYPE(dev_priv) >= PCH_SPT)
> @@ -2740,7 +2830,11 @@ static void gen11_display_irq_reset(struct drm_i915_private *dev_priv)
>
> GEN3_IRQ_RESET(uncore, GEN8_DE_PORT_);
> GEN3_IRQ_RESET(uncore, GEN8_DE_MISC_);
> - GEN3_IRQ_RESET(uncore, GEN11_DE_HPD_);
> +
> + if (DISPLAY_VER(dev_priv) >= 14)
> + GEN3_IRQ_RESET(uncore, PICAINTERRUPT_);
> + else
> + GEN3_IRQ_RESET(uncore, GEN11_DE_HPD_);
>
> if (INTEL_PCH_TYPE(dev_priv) >= PCH_ICP)
> GEN3_IRQ_RESET(uncore, SDE);
> @@ -3031,6 +3125,116 @@ static void gen11_hpd_irq_setup(struct drm_i915_private *dev_priv)
> icp_hpd_irq_setup(dev_priv);
> }
>
> +static u32 mtp_ddi_hotplug_enables(struct intel_encoder *encoder)
> +{
> + switch (encoder->hpd_pin) {
> + case HPD_PORT_A:
> + case HPD_PORT_B:
> + return SHOTPLUG_CTL_DDI_HPD_ENABLE(encoder->hpd_pin);
> + default:
> + return 0;
> + }
> +}
> +
> +static u32 mtp_tc_hotplug_enables(struct intel_encoder *encoder)
> +{
> + switch (encoder->hpd_pin) {
> + case HPD_PORT_TC1:
> + case HPD_PORT_TC2:
> + case HPD_PORT_TC3:
> + case HPD_PORT_TC4:
> + return ICP_TC_HPD_ENABLE(encoder->hpd_pin);
> + default:
> + return 0;
> + }
> +}
> +
> +static void mtp_ddi_hpd_detection_setup(struct drm_i915_private *i915)
> +{
> + intel_de_rmw(i915, SHOTPLUG_CTL_DDI,
> + (SHOTPLUG_CTL_DDI_HPD_ENABLE(HPD_PORT_A) |
> + SHOTPLUG_CTL_DDI_HPD_ENABLE(HPD_PORT_B)),
> + intel_hpd_hotplug_enables(i915, mtp_ddi_hotplug_enables));
> +}
> +
> +static void mtp_tc_hpd_detection_setup(struct drm_i915_private *i915)
> +{
> + intel_de_rmw(i915, SHOTPLUG_CTL_TC,
> + (ICP_TC_HPD_ENABLE(HPD_PORT_TC1) |
> + ICP_TC_HPD_ENABLE(HPD_PORT_TC2) |
> + ICP_TC_HPD_ENABLE(HPD_PORT_TC3) |
> + ICP_TC_HPD_ENABLE(HPD_PORT_TC4)),
> + intel_hpd_hotplug_enables(i915, mtp_tc_hotplug_enables));
> +}
> +
> +static void mtp_hpd_invert(struct drm_i915_private *i915)
> +{
> + u32 val = (INVERT_DDIA_HPD |
> + INVERT_DDIB_HPD |
> + INVERT_DDIC_HPD |
> + INVERT_TC1_HPD |
> + INVERT_TC2_HPD |
> + INVERT_TC3_HPD |
> + INVERT_TC4_HPD |
> + INVERT_DDID_HPD_MTP |
> + INVERT_DDIE_HPD);
> + intel_de_rmw(i915, SOUTH_CHICKEN1, 0, val);
> +}
> +
> +static void mtp_hpd_irq_setup(struct drm_i915_private *i915)
> +{
> + u32 hotplug_irqs, enabled_irqs;
> +
> + enabled_irqs = intel_hpd_enabled_irqs(i915, i915->display.hotplug.pch_hpd);
> + hotplug_irqs = intel_hpd_hotplug_irqs(i915, i915->display.hotplug.pch_hpd);
> +
> + intel_de_write(i915, SHPD_FILTER_CNT, SHPD_FILTER_CNT_500_ADJ);
> +
> + mtp_hpd_invert(i915);
> + ibx_display_interrupt_update(i915, hotplug_irqs, enabled_irqs);
> +
> + mtp_ddi_hpd_detection_setup(i915);
> + mtp_tc_hpd_detection_setup(i915);
> +}
> +
> +static void xelpdp_pica_hpd_detection_setup(struct drm_i915_private *i915)
> +{
> + struct intel_encoder *encoder;
> + enum hpd_pin pin;
> + u32 available_pins = 0;
> +
> + BUILD_BUG_ON(BITS_PER_TYPE(available_pins) < HPD_NUM_PINS);
> +
> + for_each_intel_encoder(&i915->drm, encoder)
> + available_pins |= BIT(encoder->hpd_pin);
> +
> + for (pin = HPD_PORT_TC1; pin <= HPD_PORT_TC4; pin++) {
> + u32 mask = XELPDP_TBT_HOTPLUG_ENABLE |
> + XELPDP_DP_ALT_HOTPLUG_ENABLE;
> +
> + intel_de_rmw(i915, XELPDP_PORT_HOTPLUG_CTL(pin),
> + mask,
> + available_pins & BIT(pin) ? mask : 0);
> + }
> +}
> +
> +static void xelpdp_hpd_irq_setup(struct drm_i915_private *i915)
> +{
> + u32 hotplug_irqs, enabled_irqs;
> +
> + enabled_irqs = intel_hpd_enabled_irqs(i915, i915->display.hotplug.hpd);
> + hotplug_irqs = intel_hpd_hotplug_irqs(i915, i915->display.hotplug.hpd);
> +
> + intel_de_rmw(i915, PICAINTERRUPT_IMR, hotplug_irqs,
> + ~enabled_irqs & hotplug_irqs);
> + intel_uncore_posting_read(&i915->uncore, PICAINTERRUPT_IMR);
> +
> + xelpdp_pica_hpd_detection_setup(i915);
> +
> + if (INTEL_PCH_TYPE(i915) >= PCH_MTP)
> + mtp_hpd_irq_setup(i915);
> +}
> +
> static u32 spt_hotplug_enables(struct intel_encoder *encoder)
> {
> switch (encoder->hpd_pin) {
> @@ -3363,7 +3567,7 @@ static void gen8_de_irq_postinstall(struct drm_i915_private *dev_priv)
> GEN3_IRQ_INIT(uncore, GEN8_DE_PORT_, ~de_port_masked, de_port_enables);
> GEN3_IRQ_INIT(uncore, GEN8_DE_MISC_, ~de_misc_masked, de_misc_masked);
>
> - if (DISPLAY_VER(dev_priv) >= 11) {
> + if (IS_DISPLAY_VER(dev_priv, 11, 13)) {
> u32 de_hpd_masked = 0;
> u32 de_hpd_enables = GEN11_DE_TC_HOTPLUG_MASK |
> GEN11_DE_TBT_HOTPLUG_MASK;
> @@ -3373,6 +3577,20 @@ static void gen8_de_irq_postinstall(struct drm_i915_private *dev_priv)
> }
> }
>
> +static void mtp_irq_postinstall(struct drm_i915_private *i915)
> +{
> + struct intel_uncore *uncore = &i915->uncore;
> + u32 sde_mask = SDE_GMBUS_ICP | SDE_PICAINTERRUPT;
> + u32 de_hpd_mask = XELPDP_AUX_TC_MASK;
> + u32 de_hpd_enables = de_hpd_mask | XELPDP_DP_ALT_HOTPLUG_MASK |
> + XELPDP_TBT_HOTPLUG_MASK;
> +
> + GEN3_IRQ_INIT(uncore, PICAINTERRUPT_, ~de_hpd_mask,
> + de_hpd_enables);
> +
> + GEN3_IRQ_INIT(uncore, SDE, ~sde_mask, 0xffffffff);
> +}
> +
> static void icp_irq_postinstall(struct drm_i915_private *dev_priv)
> {
> struct intel_uncore *uncore = &dev_priv->uncore;
> @@ -3434,7 +3652,11 @@ static void dg1_irq_postinstall(struct drm_i915_private *dev_priv)
> GEN3_IRQ_INIT(uncore, GEN11_GU_MISC_, ~gu_misc_masked, gu_misc_masked);
>
> if (HAS_DISPLAY(dev_priv)) {
> - icp_irq_postinstall(dev_priv);
> + if (DISPLAY_VER(dev_priv) >= 14)
> + mtp_irq_postinstall(dev_priv);
> + else
> + icp_irq_postinstall(dev_priv);
> +
So this is dg1_irq_postinstall() called for GRAPHICS_VER_FULL(i915) >=
IP_VER(12, 10).
Why do we call PCH irq postinstall functions based on display version
instead of the PCH in question?
DG1 and DG2 have south engine display on the same PCI device which we
denote by PCH_DG1 and PCH_DG2, respectively.
This might work now, but seems a bit fishy.
BR,
Jani.
> gen8_de_irq_postinstall(dev_priv);
> intel_uncore_write(&dev_priv->uncore, GEN11_DISPLAY_INT_CTL,
> GEN11_DISPLAY_IRQ_ENABLE);
> @@ -3920,6 +4142,7 @@ static const struct intel_hotplug_funcs platform##_hpd_funcs = { \
> }
>
> HPD_FUNCS(i915);
> +HPD_FUNCS(xelpdp);
> HPD_FUNCS(dg1);
> HPD_FUNCS(gen11);
> HPD_FUNCS(bxt);
> @@ -3980,6 +4203,8 @@ void intel_irq_init(struct drm_i915_private *dev_priv)
> dev_priv->display.funcs.hotplug = &icp_hpd_funcs;
> else if (HAS_PCH_DG1(dev_priv))
> dev_priv->display.funcs.hotplug = &dg1_hpd_funcs;
> + else if (DISPLAY_VER(dev_priv) >= 14)
> + dev_priv->display.funcs.hotplug = &xelpdp_hpd_funcs;
> else if (DISPLAY_VER(dev_priv) >= 11)
> dev_priv->display.funcs.hotplug = &gen11_hpd_funcs;
> else if (IS_GEMINILAKE(dev_priv) || IS_BROXTON(dev_priv))
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index d68ec36733c9..531c0ea68c05 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -4487,6 +4487,28 @@
> #define GEN11_HOTPLUG_CTL_SHORT_DETECT(hpd_pin) (1 << (_HPD_PIN_TC(hpd_pin) * 4))
> #define GEN11_HOTPLUG_CTL_NO_DETECT(hpd_pin) (0 << (_HPD_PIN_TC(hpd_pin) * 4))
>
> +#define PICAINTERRUPT_ISR _MMIO(0x16FE50)
> +#define PICAINTERRUPT_IMR _MMIO(0x16FE54)
> +#define PICAINTERRUPT_IIR _MMIO(0x16FE58)
> +#define PICAINTERRUPT_IER _MMIO(0x16FE5C)
> +
> +#define XELPDP_DP_ALT_HOTPLUG(hpd_pin) REG_BIT(16 + _HPD_PIN_TC(hpd_pin))
> +#define XELPDP_DP_ALT_HOTPLUG_MASK REG_GENMASK(19, 16)
> +
> +#define XELPDP_AUX_TC(hpd_pin) REG_BIT(8 + _HPD_PIN_TC(hpd_pin))
> +#define XELPDP_AUX_TC_MASK REG_GENMASK(11, 8)
> +
> +#define XELPDP_TBT_HOTPLUG(hpd_pin) REG_BIT(_HPD_PIN_TC(hpd_pin))
> +#define XELPDP_TBT_HOTPLUG_MASK REG_GENMASK(3, 0)
> +
> +#define XELPDP_PORT_HOTPLUG_CTL(hpd_pin) _MMIO(0x16F270 + (_HPD_PIN_TC(hpd_pin) * 0x200))
> +#define XELPDP_TBT_HOTPLUG_ENABLE REG_BIT(6)
> +#define XELPDP_TBT_HPD_LONG_DETECT REG_BIT(5)
> +#define XELPDP_TBT_HPD_SHORT_DETECT REG_BIT(4)
> +#define XELPDP_DP_ALT_HOTPLUG_ENABLE REG_BIT(2)
> +#define XELPDP_DP_ALT_HPD_LONG_DETECT REG_BIT(1)
> +#define XELPDP_DP_ALT_HPD_SHORT_DETECT REG_BIT(0)
> +
> #define ILK_DISPLAY_CHICKEN2 _MMIO(0x42004)
> /* Required on all Ironlake and Sandybridge according to the B-Spec. */
> #define ILK_ELPIN_409_SELECT (1 << 25)
> @@ -4772,7 +4794,8 @@
> SDE_FDI_RXB_CPT | \
> SDE_FDI_RXA_CPT)
>
> -/* south display engine interrupt: ICP/TGP */
> +/* south display engine interrupt: ICP/TGP/MTP */
> +#define SDE_PICAINTERRUPT REG_BIT(31)
> #define SDE_GMBUS_ICP (1 << 23)
> #define SDE_TC_HOTPLUG_ICP(hpd_pin) REG_BIT(24 + _HPD_PIN_TC(hpd_pin))
> #define SDE_TC_HOTPLUG_DG2(hpd_pin) REG_BIT(25 + _HPD_PIN_TC(hpd_pin)) /* sigh */
> @@ -5126,6 +5149,12 @@
> #define SOUTH_CHICKEN1 _MMIO(0xc2000)
> #define FDIA_PHASE_SYNC_SHIFT_OVR 19
> #define FDIA_PHASE_SYNC_SHIFT_EN 18
> +#define INVERT_DDIE_HPD REG_BIT(28)
> +#define INVERT_DDID_HPD_MTP REG_BIT(27)
> +#define INVERT_TC4_HPD REG_BIT(26)
> +#define INVERT_TC3_HPD REG_BIT(25)
> +#define INVERT_TC2_HPD REG_BIT(24)
> +#define INVERT_TC1_HPD REG_BIT(23)
> #define INVERT_DDID_HPD (1 << 18)
> #define INVERT_DDIC_HPD (1 << 17)
> #define INVERT_DDIB_HPD (1 << 16)
--
Jani Nikula, Intel Open Source Graphics Center
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