[Intel-gfx] [PATCH 3/6] drm/i915/dg1: map/unmap pll clocks
Matt Roper
matthew.d.roper at intel.com
Thu Oct 22 23:22:01 UTC 2020
On Wed, Oct 21, 2020 at 01:20:31AM -0700, Lucas De Marchi wrote:
> DG1 uses 2 registers for the ddi clock mapping, with PHY A and B using
> DPCLKA_CFGCR0 and PHY C and D using DPCLKA1_CFGCR0. Hide this behind a
> single macro that chooses the correct register according to the phy
> being accessed, use the correct bitfields for each pll/phy and implement
> separate functions for DG1 since it doesn't share much with ICL/TGL
> anymore.
>
> The previous values were correct for PHY A and B since they were using
> the same register as before and the bitfields were matching.
>
> Cc: José Roberto de Souza <jose.souza at intel.com>
> Cc: Clinton Taylor <Clinton.A.Taylor at intel.com>
> Signed-off-by: Lucas De Marchi <lucas.demarchi at intel.com>
> ---
> drivers/gpu/drm/i915/display/intel_ddi.c | 92 +++++++++++++++++++-
> drivers/gpu/drm/i915/display/intel_display.c | 25 +++++-
> drivers/gpu/drm/i915/i915_reg.h | 15 ++++
> 3 files changed, 128 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
> index 3a99f209f1e6..feb9512fb204 100644
> --- a/drivers/gpu/drm/i915/display/intel_ddi.c
> +++ b/drivers/gpu/drm/i915/display/intel_ddi.c
> @@ -2970,6 +2970,38 @@ static u32 icl_dpclka_cfgcr0_clk_off(struct drm_i915_private *dev_priv,
> return 0;
> }
>
> +static void dg1_map_plls_to_ports(struct intel_encoder *encoder,
> + const struct intel_crtc_state *crtc_state)
> +{
> + struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
> + struct intel_shared_dpll *pll = crtc_state->shared_dpll;
> + enum phy phy = intel_port_to_phy(dev_priv, encoder->port);
> + u32 val;
> +
> + /*
> + * If we fail this, something went very wrong: first 2 PLLs should be
> + * used by first 2 phys and last 2 PLLs by last phys
> + */
> + if (WARN_ON((pll->info->id < DPLL_ID_DG1_DPLL2 && phy >= PHY_C) ||
> + (pll->info->id >= DPLL_ID_DG1_DPLL2 && phy < PHY_C)))
> + return;
> +
> + mutex_lock(&dev_priv->dpll.lock);
Not specifically related to this patch, but since we're adding more uses
of it --- is dpll.lock actually necessary on any modern platform? My
understanding is that it was added to prevent racing rmw operations if
we had parallel modesets on different CRTCs. But I think any modeset on
a gen9+ platform needs to update other global state (the DDB) and would
have already grabbed all CRTC locks to prevent racing commits. Am I
missing something?
> +
> + val = intel_de_read(dev_priv, DG1_DPCLKA_CFGCR0(phy));
> + WARN_ON((val & DG1_DPCLKA_CFGCR0_DDI_CLK_OFF(phy)) == 0);
> +
> + val &= ~DG1_DPCLKA_CFGCR0_DDI_CLK_SEL_MASK(phy);
> + val |= DG1_DPCLKA_CFGCR0_DDI_CLK_SEL(pll->info->id, phy);
> + intel_de_write(dev_priv, DG1_DPCLKA_CFGCR0(phy), val);
> + intel_de_posting_read(dev_priv, DG1_DPCLKA_CFGCR0(phy));
> +
> + val &= ~DG1_DPCLKA_CFGCR0_DDI_CLK_OFF(phy);
> + intel_de_write(dev_priv, DG1_DPCLKA_CFGCR0(phy), val);
> +
> + mutex_unlock(&dev_priv->dpll.lock);
> +}
> +
> static void icl_map_plls_to_ports(struct intel_encoder *encoder,
> const struct intel_crtc_state *crtc_state)
> {
> @@ -3017,6 +3049,19 @@ static void icl_map_plls_to_ports(struct intel_encoder *encoder,
> mutex_unlock(&dev_priv->dpll.lock);
> }
>
> +static void dg1_unmap_plls_to_ports(struct intel_encoder *encoder)
> +{
> + struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
> + enum phy phy = intel_port_to_phy(dev_priv, encoder->port);
> +
> + mutex_lock(&dev_priv->dpll.lock);
> +
> + intel_de_rmw(dev_priv, DG1_DPCLKA_CFGCR0(phy), 0,
> + DG1_DPCLKA_CFGCR0_DDI_CLK_OFF(phy));
> +
> + mutex_unlock(&dev_priv->dpll.lock);
> +}
> +
> static void icl_unmap_plls_to_ports(struct intel_encoder *encoder)
> {
> struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
> @@ -3032,6 +3077,40 @@ static void icl_unmap_plls_to_ports(struct intel_encoder *encoder)
> mutex_unlock(&dev_priv->dpll.lock);
> }
>
> +static void dg1_sanitize_port_clk_off(struct drm_i915_private *dev_priv,
> + u32 port_mask, bool ddi_clk_needed)
> +{
> + enum port port;
> + u32 val;
> +
> + for_each_port_masked(port, port_mask) {
> + enum phy phy = intel_port_to_phy(dev_priv, port);
> + bool ddi_clk_off;
> +
> + val = intel_de_read(dev_priv, DG1_DPCLKA_CFGCR0(phy));
> + ddi_clk_off = val & DG1_DPCLKA_CFGCR0_DDI_CLK_OFF(phy);
> +
> + if (ddi_clk_needed == !ddi_clk_off)
> + continue;
> +
> + /*
> + * Punt on the case now where clock is gated, but it would
> + * be needed by the port. Something else is really broken then.
> + */
> + if (ddi_clk_needed) {
> + WARN(1, "ddi_clk_needed=%u ddi_clk_off=%u phy=%u\n",
> + ddi_clk_needed, ddi_clk_off, phy);
> + continue;
> + }
> +
> + DRM_NOTE("PHY %c is disabled/in DSI mode with an ungated DDI clock, gate it\n",
> + phy_name(phy));
> +
> + val |= DG1_DPCLKA_CFGCR0_DDI_CLK_OFF(phy);
> + intel_de_write(dev_priv, DG1_DPCLKA_CFGCR0(phy), val);
> + }
> +}
> +
> static void icl_sanitize_port_clk_off(struct drm_i915_private *dev_priv,
> u32 port_mask, bool ddi_clk_needed)
> {
> @@ -3114,7 +3193,10 @@ void icl_sanitize_encoder_pll_mapping(struct intel_encoder *encoder)
> ddi_clk_needed = false;
> }
>
> - icl_sanitize_port_clk_off(dev_priv, port_mask, ddi_clk_needed);
> + if (IS_DG1(dev_priv))
> + dg1_sanitize_port_clk_off(dev_priv, port_mask, ddi_clk_needed);
> + else
> + icl_sanitize_port_clk_off(dev_priv, port_mask, ddi_clk_needed);
> }
>
> static void intel_ddi_clk_select(struct intel_encoder *encoder,
> @@ -3666,7 +3748,9 @@ static void intel_ddi_pre_enable(struct intel_atomic_state *state,
>
> drm_WARN_ON(&dev_priv->drm, crtc_state->has_pch_encoder);
>
> - if (INTEL_GEN(dev_priv) >= 11)
> + if (IS_DG1(dev_priv))
> + dg1_map_plls_to_ports(encoder, crtc_state);
> + else if (INTEL_GEN(dev_priv) >= 11)
> icl_map_plls_to_ports(encoder, crtc_state);
>
> intel_set_cpu_fifo_underrun_reporting(dev_priv, pipe, true);
> @@ -3848,7 +3932,9 @@ static void intel_ddi_post_disable(struct intel_atomic_state *state,
> intel_ddi_post_disable_dp(state, encoder, old_crtc_state,
> old_conn_state);
>
> - if (INTEL_GEN(dev_priv) >= 11)
> + if (IS_DG1(dev_priv))
> + dg1_unmap_plls_to_ports(encoder);
> + else if (INTEL_GEN(dev_priv) >= 11)
> icl_unmap_plls_to_ports(encoder);
>
> if (intel_crtc_has_dp_encoder(old_crtc_state) || is_tc_port)
> diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
> index 24d85b2689d5..137e4a604f74 100644
> --- a/drivers/gpu/drm/i915/display/intel_display.c
> +++ b/drivers/gpu/drm/i915/display/intel_display.c
> @@ -10897,6 +10897,27 @@ static int hsw_crtc_compute_clock(struct intel_crtc *crtc,
> return 0;
> }
>
> +static void dg1_get_ddi_pll(struct drm_i915_private *dev_priv, enum port port,
> + struct intel_crtc_state *pipe_config)
> +{
> + enum icl_port_dpll_id port_dpll_id = ICL_PORT_DPLL_DEFAULT;
> + enum phy phy = intel_port_to_phy(dev_priv, port);
> + enum intel_dpll_id id;
> + u32 val;
> +
> + val = intel_de_read(dev_priv, DG1_DPCLKA_CFGCR0(phy))
> + & DG1_DPCLKA_CFGCR0_DDI_CLK_SEL_MASK(phy);
> + id = DG1_DPCLKA_CFGCR0_DDI_CLK_SEL_VAL_TO_ID(val, phy);
> +
> + if (WARN_ON(id > DPLL_ID_DG1_DPLL3))
> + return;
> +
> + pipe_config->icl_port_dplls[port_dpll_id].pll =
> + intel_get_shared_dpll_by_id(dev_priv, id);
> +
> + icl_set_active_port_dpll(pipe_config, port_dpll_id);
> +}
> +
> static void cnl_get_ddi_pll(struct drm_i915_private *dev_priv, enum port port,
> struct intel_crtc_state *pipe_config)
> {
> @@ -11205,7 +11226,9 @@ static void hsw_get_ddi_port_state(struct intel_crtc *crtc,
> port = TRANS_DDI_FUNC_CTL_VAL_TO_PORT(tmp);
> }
>
> - if (INTEL_GEN(dev_priv) >= 11)
> + if (IS_DG1(dev_priv))
> + dg1_get_ddi_pll(dev_priv, port, pipe_config);
> + else if (INTEL_GEN(dev_priv) >= 11)
> icl_get_ddi_pll(dev_priv, port, pipe_config);
> else if (IS_CANNONLAKE(dev_priv))
> cnl_get_ddi_pll(dev_priv, port, pipe_config);
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index c7ce3d03b588..80e754a65117 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -230,12 +230,14 @@ static inline bool i915_mmio_reg_valid(i915_reg_t reg)
> #define _TRANS(tran, a, b) _PICK_EVEN(tran, a, b)
> #define _PORT(port, a, b) _PICK_EVEN(port, a, b)
> #define _PLL(pll, a, b) _PICK_EVEN(pll, a, b)
> +#define _PHY(phy, a, b) _PICK_EVEN(phy, a, b)
>
> #define _MMIO_PIPE(pipe, a, b) _MMIO(_PIPE(pipe, a, b))
> #define _MMIO_PLANE(plane, a, b) _MMIO(_PLANE(plane, a, b))
> #define _MMIO_TRANS(tran, a, b) _MMIO(_TRANS(tran, a, b))
> #define _MMIO_PORT(port, a, b) _MMIO(_PORT(port, a, b))
> #define _MMIO_PLL(pll, a, b) _MMIO(_PLL(pll, a, b))
> +#define _MMIO_PHY(phy, a, b) _MMIO(_PHY(phy, a, b))
>
> #define _PHY3(phy, ...) _PICK(phy, __VA_ARGS__)
>
> @@ -10299,6 +10301,7 @@ enum skl_power_gate {
> #define DPCLKA_CFGCR0_DDI_CLK_SEL_MASK(port) (3 << DPCLKA_CFGCR0_DDI_CLK_SEL_SHIFT(port))
> #define DPCLKA_CFGCR0_DDI_CLK_SEL(pll, port) ((pll) << DPCLKA_CFGCR0_DDI_CLK_SEL_SHIFT(port))
>
> +/* ICL Clocks */
> #define ICL_DPCLKA_CFGCR0 _MMIO(0x164280)
> #define ICL_DPCLKA_CFGCR0_DDI_CLK_OFF(phy) (1 << _PICK(phy, 10, 11, 24))
> #define RKL_DPCLKA_CFGCR0_DDI_CLK_OFF(phy) REG_BIT((phy) + 10)
> @@ -10314,6 +10317,18 @@ enum skl_power_gate {
> #define RKL_DPCLKA_CFGCR0_DDI_CLK_SEL(pll, phy) \
> ((pll) << RKL_DPCLKA_CFGCR0_DDI_CLK_SEL_SHIFT(phy))
>
> +/* DG1 Clocks */
> +#define _DG1_DPCLKA_CFGCR0 0x164280
> +#define _DG1_DPCLKA1_CFGCR0 0x16C280
> +#define DG1_DPCLKA_CFGCR0(phy) _MMIO_PHY((phy) / 2, \
> + _DG1_DPCLKA_CFGCR0, \
> + _DG1_DPCLKA1_CFGCR0)
> +#define DG1_DPCLKA_CFGCR0_DDI_CLK_OFF(phy) (1 << (10 + ((phy) % 2)))
> +#define DG1_DPCLKA_CFGCR0_DDI_CLK_SEL_MASK(phy) (0x3 << (((phy) % 2) * 2))
> +#define DG1_DPCLKA_CFGCR0_DDI_CLK_SEL(pll, phy) (((pll) % 2) << (((phy) % 2)) * 2)
> +#define DG1_DPCLKA_CFGCR0_DDI_CLK_SEL_VAL_TO_ID(val, phy) \
> + ((((val) & DG1_DPCLKA_CFGCR0_DDI_CLK_SEL_MASK(phy)) >> ((phy % 2) * 2)) + (2 * (phy / 2)))
This sure is ugly. But it looks correct.
Although the code might wind up being slightly longer, I wonder if it
would help clarify if we wrote a few at least the last part of this
expression with ternary operators and symbolic names. E.g.,
"... + (phy >= PHY_C ? DPLL_ID_DG1_DPLL2 : DPLL_ID_DG1_DPLL0)"
Up to you; the patch looks fine either way.
Reviewed-by: Matt Roper <matthew.d.roper at intel.com>
> +
> /* CNL PLL */
> #define DPLL0_ENABLE 0x46010
> #define DPLL1_ENABLE 0x46014
> --
> 2.28.0
>
--
Matt Roper
Graphics Software Engineer
VTT-OSGC Platform Enablement
Intel Corporation
(916) 356-2795
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