On Fri, Jun 05, 2020 at 07:57:34PM -0700, Matt Roper wrote:
> Rocket Lake uses the same 'abox0' mechanism to handle pixel data
> transfers from memory that gen11 platforms used, rather than the
> abox1/abox2 interfaces used by TGL/DG1. For the most part this is a
> hardware implementation detail that's transparent to driver software,
> but we do have to program a couple of tuning registers (MBUS_ABOX_CTL
> and BW_BUDDY registers) according to which ABOX instances are used by a
> platform. Let's track the platform's ABOX usage in the device info
> structure and use that to determine which instances of these registers
> to program.
>
> As an exception to this rule is that even though TGL/DG1 use ABOX1+ABOX2
> for data transfers, we're still directed to program the ABOX_CTL
> register for ABOX0; so we'll handle that as a special case.
>
> v2:
> - Store the mask of platform-specific abox registers in the device
> info structure.
> - Add a TLB_REQ_TIMER() helper macro. (Aditya)
>
> v3:
> - Squash ABOX and BW_BUDDY patches together and use a single mask for
> both of them, plus a special-case for programming the ABOX0 instance
> on all gen12. (Ville)
>
> Bspec: 50096
> Bspec: 49218
> Cc: Ville Syrjälä <ville.syrj...@linux.intel.com>
> Cc: Aditya Swarup <aditya.swa...@intel.com>
> Signed-off-by: Matt Roper <matthew.d.ro...@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrj...@linux.intel.com>
> ---
> .../drm/i915/display/intel_display_power.c | 55 ++++++++++---------
> drivers/gpu/drm/i915/i915_pci.c | 3 +
> drivers/gpu/drm/i915/i915_reg.h | 24 +++++---
> drivers/gpu/drm/i915/intel_device_info.h | 2 +
> 4 files changed, 52 insertions(+), 32 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_display_power.c
> b/drivers/gpu/drm/i915/display/intel_display_power.c
> index 72312b67b57a..24a2aa1fdc9c 100644
> --- a/drivers/gpu/drm/i915/display/intel_display_power.c
> +++ b/drivers/gpu/drm/i915/display/intel_display_power.c
> @@ -4760,7 +4760,8 @@ static void gen9_dbuf_disable(struct drm_i915_private
> *dev_priv)
>
> static void icl_mbus_init(struct drm_i915_private *dev_priv)
> {
> - u32 mask, val;
> + unsigned long abox_regs = INTEL_INFO(dev_priv)->abox_mask;
> + u32 mask, val, i;
>
> mask = MBUS_ABOX_BT_CREDIT_POOL1_MASK |
> MBUS_ABOX_BT_CREDIT_POOL2_MASK |
> @@ -4771,11 +4772,16 @@ static void icl_mbus_init(struct drm_i915_private
> *dev_priv)
> MBUS_ABOX_B_CREDIT(1) |
> MBUS_ABOX_BW_CREDIT(1);
>
> - intel_de_rmw(dev_priv, MBUS_ABOX_CTL, mask, val);
> - if (INTEL_GEN(dev_priv) >= 12) {
> - intel_de_rmw(dev_priv, MBUS_ABOX1_CTL, mask, val);
> - intel_de_rmw(dev_priv, MBUS_ABOX2_CTL, mask, val);
> - }
> + /*
> + * gen12 platforms that use abox1 and abox2 for pixel data reads still
> + * expect us to program the abox_ctl0 register as well, even though
> + * we don't have to program other instance-0 registers like BW_BUDDY.
> + */
> + if (IS_GEN(dev_priv, 12))
> + abox_regs |= BIT(0);
> +
> + for_each_set_bit(i, &abox_regs, sizeof(abox_regs))
> + intel_de_rmw(dev_priv, MBUS_ABOX_CTL(i), mask, val);
> }
>
> static void hsw_assert_cdclk(struct drm_i915_private *dev_priv)
> @@ -5254,7 +5260,8 @@ static void tgl_bw_buddy_init(struct drm_i915_private
> *dev_priv)
> enum intel_dram_type type = dev_priv->dram_info.type;
> u8 num_channels = dev_priv->dram_info.num_channels;
> const struct buddy_page_mask *table;
> - int i;
> + unsigned long abox_mask = INTEL_INFO(dev_priv)->abox_mask;
> + int config, i;
>
> if (IS_TGL_REVID(dev_priv, TGL_REVID_A0, TGL_REVID_B0))
> /* Wa_1409767108: tgl */
> @@ -5262,29 +5269,27 @@ static void tgl_bw_buddy_init(struct drm_i915_private
> *dev_priv)
> else
> table = tgl_buddy_page_masks;
>
> - for (i = 0; table[i].page_mask != 0; i++)
> - if (table[i].num_channels == num_channels &&
> - table[i].type == type)
> + for (config = 0; table[config].page_mask != 0; config++)
> + if (table[config].num_channels == num_channels &&
> + table[config].type == type)
> break;
>
> - if (table[i].page_mask == 0) {
> + if (table[config].page_mask == 0) {
> drm_dbg(&dev_priv->drm,
> "Unknown memory configuration; disabling address buddy
> logic.\n");
> - intel_de_write(dev_priv, BW_BUDDY1_CTL, BW_BUDDY_DISABLE);
> - intel_de_write(dev_priv, BW_BUDDY2_CTL, BW_BUDDY_DISABLE);
> + for_each_set_bit(i, &abox_mask, sizeof(abox_mask))
> + intel_de_write(dev_priv, BW_BUDDY_CTL(i),
> + BW_BUDDY_DISABLE);
> } else {
> - intel_de_write(dev_priv, BW_BUDDY1_PAGE_MASK,
> - table[i].page_mask);
> - intel_de_write(dev_priv, BW_BUDDY2_PAGE_MASK,
> - table[i].page_mask);
> -
> - /* Wa_22010178259:tgl */
> - intel_de_rmw(dev_priv, BW_BUDDY1_CTL,
> - BW_BUDDY_TLB_REQ_TIMER_MASK,
> - REG_FIELD_PREP(BW_BUDDY_TLB_REQ_TIMER_MASK, 0x8));
> - intel_de_rmw(dev_priv, BW_BUDDY2_CTL,
> - BW_BUDDY_TLB_REQ_TIMER_MASK,
> - REG_FIELD_PREP(BW_BUDDY_TLB_REQ_TIMER_MASK, 0x8));
> + for_each_set_bit(i, &abox_mask, sizeof(abox_mask)) {
> + intel_de_write(dev_priv, BW_BUDDY_PAGE_MASK(i),
> + table[config].page_mask);
> +
> + /* Wa_22010178259:tgl,rkl */
> + intel_de_rmw(dev_priv, BW_BUDDY_CTL(i),
> + BW_BUDDY_TLB_REQ_TIMER_MASK,
> + BW_BUDDY_TLB_REQ_TIMER(0x8));
> + }
> }
> }
>
> diff --git a/drivers/gpu/drm/i915/i915_pci.c b/drivers/gpu/drm/i915/i915_pci.c
> index 192f1cd172b8..e5fdf17cd9cd 100644
> --- a/drivers/gpu/drm/i915/i915_pci.c
> +++ b/drivers/gpu/drm/i915/i915_pci.c
> @@ -804,6 +804,7 @@ static const struct intel_device_info cnl_info = {
> #define GEN11_FEATURES \
> GEN10_FEATURES, \
> GEN11_DEFAULT_PAGE_SIZES, \
> + .abox_mask = BIT(0), \
> .cpu_transcoder_mask = BIT(TRANSCODER_A) | BIT(TRANSCODER_B) | \
> BIT(TRANSCODER_C) | BIT(TRANSCODER_EDP) | \
> BIT(TRANSCODER_DSI_0) | BIT(TRANSCODER_DSI_1), \
> @@ -847,6 +848,7 @@ static const struct intel_device_info ehl_info = {
> #define GEN12_FEATURES \
> GEN11_FEATURES, \
> GEN(12), \
> + .abox_mask = GENMASK(2, 1), \
> .pipe_mask = BIT(PIPE_A) | BIT(PIPE_B) | BIT(PIPE_C) | BIT(PIPE_D), \
> .cpu_transcoder_mask = BIT(TRANSCODER_A) | BIT(TRANSCODER_B) | \
> BIT(TRANSCODER_C) | BIT(TRANSCODER_D) | \
> @@ -882,6 +884,7 @@ static const struct intel_device_info tgl_info = {
> static const struct intel_device_info rkl_info = {
> GEN12_FEATURES,
> PLATFORM(INTEL_ROCKETLAKE),
> + .abox_mask = BIT(0),
> .pipe_mask = BIT(PIPE_A) | BIT(PIPE_B) | BIT(PIPE_C),
> .cpu_transcoder_mask = BIT(TRANSCODER_A) | BIT(TRANSCODER_B) |
> BIT(TRANSCODER_C),
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index 814a70945468..4c3e822e1024 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -2879,9 +2879,12 @@ static inline bool i915_mmio_reg_valid(i915_reg_t reg)
> #define LM_FIFO_WATERMARK 0x0000001F
> #define MI_ARB_STATE _MMIO(0x20e4) /* 915+ only */
>
> -#define MBUS_ABOX_CTL _MMIO(0x45038)
> -#define MBUS_ABOX1_CTL _MMIO(0x45048)
> -#define MBUS_ABOX2_CTL _MMIO(0x4504C)
> +#define _MBUS_ABOX0_CTL 0x45038
> +#define _MBUS_ABOX1_CTL 0x45048
> +#define _MBUS_ABOX2_CTL 0x4504C
> +#define MBUS_ABOX_CTL(x) _MMIO(_PICK(x, _MBUS_ABOX0_CTL, \
> + _MBUS_ABOX1_CTL, \
> + _MBUS_ABOX2_CTL))
> #define MBUS_ABOX_BW_CREDIT_MASK (3 << 20)
> #define MBUS_ABOX_BW_CREDIT(x) ((x) << 20)
> #define MBUS_ABOX_B_CREDIT_MASK (0xF << 16)
> @@ -7839,13 +7842,20 @@ enum {
> #define WAIT_FOR_PCH_RESET_ACK (1 << 1)
> #define WAIT_FOR_PCH_FLR_ACK (1 << 0)
>
> -#define BW_BUDDY1_CTL _MMIO(0x45140)
> -#define BW_BUDDY2_CTL _MMIO(0x45150)
> +#define _BW_BUDDY0_CTL 0x45130
> +#define _BW_BUDDY1_CTL 0x45140
> +#define BW_BUDDY_CTL(x) _MMIO(_PICK_EVEN(x, \
> + _BW_BUDDY0_CTL, \
> + _BW_BUDDY1_CTL))
> #define BW_BUDDY_DISABLE REG_BIT(31)
> #define BW_BUDDY_TLB_REQ_TIMER_MASK REG_GENMASK(21, 16)
> +#define BW_BUDDY_TLB_REQ_TIMER(x)
> REG_FIELD_PREP(BW_BUDDY_TLB_REQ_TIMER_MASK, x)
>
> -#define BW_BUDDY1_PAGE_MASK _MMIO(0x45144)
> -#define BW_BUDDY2_PAGE_MASK _MMIO(0x45154)
> +#define _BW_BUDDY0_PAGE_MASK 0x45134
> +#define _BW_BUDDY1_PAGE_MASK 0x45144
> +#define BW_BUDDY_PAGE_MASK(x) _MMIO(_PICK_EVEN(x, \
> + _BW_BUDDY0_PAGE_MASK, \
> + _BW_BUDDY1_PAGE_MASK))
>
> #define HSW_NDE_RSTWRN_OPT _MMIO(0x46408)
> #define RESET_PCH_HANDSHAKE_ENABLE (1 << 4)
> diff --git a/drivers/gpu/drm/i915/intel_device_info.h
> b/drivers/gpu/drm/i915/intel_device_info.h
> index 34dbffd65bad..8d62b8538585 100644
> --- a/drivers/gpu/drm/i915/intel_device_info.h
> +++ b/drivers/gpu/drm/i915/intel_device_info.h
> @@ -175,6 +175,8 @@ struct intel_device_info {
> u8 pipe_mask;
> u8 cpu_transcoder_mask;
>
> + u8 abox_mask;
> +
> #define DEFINE_FLAG(name) u8 name:1
> DEV_INFO_FOR_EACH_FLAG(DEFINE_FLAG);
> #undef DEFINE_FLAG
> --
> 2.24.1
--
Ville Syrjälä
Intel
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