[Intel-gfx] [PATCH 2/3] drm/i915/dg2: use existing mechanisms for SNPS PHY translations
Matt Roper
matthew.d.roper at intel.com
Fri Aug 13 17:59:33 UTC 2021
On Fri, Aug 13, 2021 at 02:51:50PM +0300, Jani Nikula wrote:
> We use encoder->get_buf_trans() in many places, for example
> intel_ddi_dp_voltage_max(), and the hook was set to some old platform's
> function for DG2 SNPS PHY. Convert SNPS PHY to use the same translation
> mechanisms as everything else.
>
> Cc: Manasi Navare <manasi.d.navare at intel.com>
> Cc: Matt Roper <matthew.d.roper at intel.com>
> Signed-off-by: Jani Nikula <jani.nikula at intel.com>
> ---
> drivers/gpu/drm/i915/display/intel_ddi.c | 6 +-
> .../drm/i915/display/intel_ddi_buf_trans.c | 31 +++++++++-
> .../drm/i915/display/intel_ddi_buf_trans.h | 7 +++
> drivers/gpu/drm/i915/display/intel_snps_phy.c | 61 ++++++-------------
> drivers/gpu/drm/i915/display/intel_snps_phy.h | 3 +-
> 5 files changed, 59 insertions(+), 49 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
> index 8cf5d1572ee0..9e46cf5c4378 100644
> --- a/drivers/gpu/drm/i915/display/intel_ddi.c
> +++ b/drivers/gpu/drm/i915/display/intel_ddi.c
> @@ -1388,7 +1388,7 @@ dg2_set_signal_levels(struct intel_dp *intel_dp,
> struct intel_encoder *encoder = &dp_to_dig_port(intel_dp)->base;
> int level = intel_ddi_dp_level(intel_dp, crtc_state);
>
> - intel_snps_phy_ddi_vswing_sequence(encoder, level);
> + intel_snps_phy_ddi_vswing_sequence(encoder, crtc_state, level);
> }
>
> static void
> @@ -2388,7 +2388,7 @@ static void dg2_ddi_pre_enable_dp(struct intel_atomic_state *state,
> */
>
> /* 5.e Configure voltage swing and related IO settings */
> - intel_snps_phy_ddi_vswing_sequence(encoder, level);
> + intel_snps_phy_ddi_vswing_sequence(encoder, crtc_state, level);
>
> /*
> * 5.f Configure and enable DDI_BUF_CTL
> @@ -3057,7 +3057,7 @@ static void intel_enable_ddi_hdmi(struct intel_atomic_state *state,
> connector->base.id, connector->name);
>
> if (IS_DG2(dev_priv))
> - intel_snps_phy_ddi_vswing_sequence(encoder, U32_MAX);
> + intel_snps_phy_ddi_vswing_sequence(encoder, crtc_state, level);
> else if (DISPLAY_VER(dev_priv) >= 12)
> tgl_ddi_vswing_sequence(encoder, crtc_state, level);
> else if (DISPLAY_VER(dev_priv) == 11)
> diff --git a/drivers/gpu/drm/i915/display/intel_ddi_buf_trans.c b/drivers/gpu/drm/i915/display/intel_ddi_buf_trans.c
> index ba2c08f1a797..ebb39624bfc9 100644
> --- a/drivers/gpu/drm/i915/display/intel_ddi_buf_trans.c
> +++ b/drivers/gpu/drm/i915/display/intel_ddi_buf_trans.c
> @@ -983,6 +983,25 @@ static const struct intel_ddi_buf_trans adlp_dkl_phy_ddi_translations_dp_hbr2_hb
> .num_entries = ARRAY_SIZE(_adlp_dkl_phy_ddi_translations_dp_hbr2_hbr3),
> };
>
> +static const union intel_ddi_buf_trans_entry _dg2_snps_translations[] = {
> + { .snps = { 26, 0, 0 } }, /* VS 0, pre-emph 0 */
> + { .snps = { 33, 0, 6 } }, /* VS 0, pre-emph 1 */
> + { .snps = { 38, 0, 12 } }, /* VS 0, pre-emph 2 */
> + { .snps = { 43, 0, 19 } }, /* VS 0, pre-emph 3 */
> + { .snps = { 39, 0, 0 } }, /* VS 1, pre-emph 0 */
> + { .snps = { 44, 0, 8 } }, /* VS 1, pre-emph 1 */
> + { .snps = { 47, 0, 15 } }, /* VS 1, pre-emph 2 */
> + { .snps = { 52, 0, 0 } }, /* VS 2, pre-emph 0 */
> + { .snps = { 51, 0, 10 } }, /* VS 2, pre-emph 1 */
> + { .snps = { 62, 0, 0 } }, /* VS 3, pre-emph 0 */
> +};
> +
> +static const struct intel_ddi_buf_trans dg2_snps_translations = {
> + .entries = _dg2_snps_translations,
> + .num_entries = ARRAY_SIZE(_dg2_snps_translations),
> + .hdmi_default_entry = ARRAY_SIZE(_dg2_snps_translations) - 1,
> +};
> +
> bool is_hobl_buf_trans(const struct intel_ddi_buf_trans *table)
> {
> return table == &tgl_combo_phy_ddi_translations_edp_hbr2_hobl;
> @@ -1563,6 +1582,14 @@ adlp_get_dkl_buf_trans(struct intel_encoder *encoder,
> return adlp_get_dkl_buf_trans_dp(encoder, crtc_state, n_entries);
> }
>
> +static const struct intel_ddi_buf_trans *
> +dg2_get_snps_buf_trans(struct intel_encoder *encoder,
> + const struct intel_crtc_state *crtc_state,
> + int *n_entries)
> +{
> + return intel_get_buf_trans(&dg2_snps_translations, n_entries);
> +}
> +
> int intel_ddi_hdmi_num_entries(struct intel_encoder *encoder,
> const struct intel_crtc_state *crtc_state,
> int *default_entry)
> @@ -1588,7 +1615,9 @@ void intel_ddi_buf_trans_init(struct intel_encoder *encoder)
> struct drm_i915_private *i915 = to_i915(encoder->base.dev);
> enum phy phy = intel_port_to_phy(i915, encoder->port);
>
> - if (IS_ALDERLAKE_P(i915)) {
> + if (IS_DG2(i915)) {
> + encoder->get_buf_trans = dg2_get_snps_buf_trans;
> + } else if (IS_ALDERLAKE_P(i915)) {
> if (intel_phy_is_combo(i915, phy))
> encoder->get_buf_trans = adlp_get_combo_buf_trans;
> else
While we're at it, maybe change the 'else' to a IS_HASWELL check and
then add a new 'else' with MISSING_CASE to make sure we don't miss this
for future platforms?
Up to you. Either way,
Reviewed-by: Matt Roper <matthew.d.roper at intel.com>
> diff --git a/drivers/gpu/drm/i915/display/intel_ddi_buf_trans.h b/drivers/gpu/drm/i915/display/intel_ddi_buf_trans.h
> index 2acd720f9d4f..94d338287f61 100644
> --- a/drivers/gpu/drm/i915/display/intel_ddi_buf_trans.h
> +++ b/drivers/gpu/drm/i915/display/intel_ddi_buf_trans.h
> @@ -45,12 +45,19 @@ struct tgl_dkl_phy_ddi_buf_trans {
> u32 dkl_de_emphasis_control;
> };
>
> +struct dg2_snps_phy_buf_trans {
> + u8 snps_vswing;
> + u8 snps_pre_cursor;
> + u8 snps_post_cursor;
> +};
> +
> union intel_ddi_buf_trans_entry {
> struct hsw_ddi_buf_trans hsw;
> struct bxt_ddi_buf_trans bxt;
> struct icl_ddi_buf_trans icl;
> struct icl_mg_phy_ddi_buf_trans mg;
> struct tgl_dkl_phy_ddi_buf_trans dkl;
> + struct dg2_snps_phy_buf_trans snps;
> };
>
> struct intel_ddi_buf_trans {
> diff --git a/drivers/gpu/drm/i915/display/intel_snps_phy.c b/drivers/gpu/drm/i915/display/intel_snps_phy.c
> index 18b52b64af95..d81f71296297 100644
> --- a/drivers/gpu/drm/i915/display/intel_snps_phy.c
> +++ b/drivers/gpu/drm/i915/display/intel_snps_phy.c
> @@ -5,6 +5,7 @@
>
> #include <linux/util_macros.h>
>
> +#include "intel_ddi_buf_trans.h"
> #include "intel_de.h"
> #include "intel_display_types.h"
> #include "intel_snps_phy.h"
> @@ -50,58 +51,30 @@ void intel_snps_phy_update_psr_power_state(struct drm_i915_private *dev_priv,
> SNPS_PHY_TX_REQ_LN_DIS_PWR_STATE_PSR, val);
> }
>
> -static const u32 dg2_ddi_translations[] = {
> - /* VS 0, pre-emph 0 */
> - REG_FIELD_PREP(SNPS_PHY_TX_EQ_MAIN, 26),
> -
> - /* VS 0, pre-emph 1 */
> - REG_FIELD_PREP(SNPS_PHY_TX_EQ_MAIN, 33) |
> - REG_FIELD_PREP(SNPS_PHY_TX_EQ_POST, 6),
> -
> - /* VS 0, pre-emph 2 */
> - REG_FIELD_PREP(SNPS_PHY_TX_EQ_MAIN, 38) |
> - REG_FIELD_PREP(SNPS_PHY_TX_EQ_POST, 12),
> -
> - /* VS 0, pre-emph 3 */
> - REG_FIELD_PREP(SNPS_PHY_TX_EQ_MAIN, 43) |
> - REG_FIELD_PREP(SNPS_PHY_TX_EQ_POST, 19),
> -
> - /* VS 1, pre-emph 0 */
> - REG_FIELD_PREP(SNPS_PHY_TX_EQ_MAIN, 39),
> -
> - /* VS 1, pre-emph 1 */
> - REG_FIELD_PREP(SNPS_PHY_TX_EQ_MAIN, 44) |
> - REG_FIELD_PREP(SNPS_PHY_TX_EQ_POST, 8),
> -
> - /* VS 1, pre-emph 2 */
> - REG_FIELD_PREP(SNPS_PHY_TX_EQ_MAIN, 47) |
> - REG_FIELD_PREP(SNPS_PHY_TX_EQ_POST, 15),
> -
> - /* VS 2, pre-emph 0 */
> - REG_FIELD_PREP(SNPS_PHY_TX_EQ_MAIN, 52),
> -
> - /* VS 2, pre-emph 1 */
> - REG_FIELD_PREP(SNPS_PHY_TX_EQ_MAIN, 51) |
> - REG_FIELD_PREP(SNPS_PHY_TX_EQ_POST, 10),
> -
> - /* VS 3, pre-emph 0 */
> - REG_FIELD_PREP(SNPS_PHY_TX_EQ_MAIN, 62),
> -};
> -
> void intel_snps_phy_ddi_vswing_sequence(struct intel_encoder *encoder,
> - u32 level)
> + const struct intel_crtc_state *crtc_state,
> + int level)
> {
> struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
> + const struct intel_ddi_buf_trans *ddi_translations;
> enum phy phy = intel_port_to_phy(dev_priv, encoder->port);
> int n_entries, ln;
>
> - n_entries = ARRAY_SIZE(dg2_ddi_translations);
> - if (level >= n_entries)
> + ddi_translations = encoder->get_buf_trans(encoder, crtc_state, &n_entries);
> + if (drm_WARN_ON_ONCE(&dev_priv->drm, !ddi_translations))
> + return;
> + if (drm_WARN_ON_ONCE(&dev_priv->drm, level < 0 || level >= n_entries))
> level = n_entries - 1;
>
> - for (ln = 0; ln < 4; ln++)
> - intel_de_write(dev_priv, SNPS_PHY_TX_EQ(ln, phy),
> - dg2_ddi_translations[level]);
> + for (ln = 0; ln < 4; ln++) {
> + u32 val = 0;
> +
> + val |= REG_FIELD_PREP(SNPS_PHY_TX_EQ_MAIN, ddi_translations->entries[level].snps.snps_vswing);
> + val |= REG_FIELD_PREP(SNPS_PHY_TX_EQ_PRE, ddi_translations->entries[level].snps.snps_pre_cursor);
> + val |= REG_FIELD_PREP(SNPS_PHY_TX_EQ_POST, ddi_translations->entries[level].snps.snps_post_cursor);
> +
> + intel_de_write(dev_priv, SNPS_PHY_TX_EQ(ln, phy), val);
> + }
> }
>
> /*
> diff --git a/drivers/gpu/drm/i915/display/intel_snps_phy.h b/drivers/gpu/drm/i915/display/intel_snps_phy.h
> index 6261ff88ef5c..a68547a6fee5 100644
> --- a/drivers/gpu/drm/i915/display/intel_snps_phy.h
> +++ b/drivers/gpu/drm/i915/display/intel_snps_phy.h
> @@ -30,6 +30,7 @@ int intel_mpllb_calc_port_clock(struct intel_encoder *encoder,
>
> int intel_snps_phy_check_hdmi_link_rate(int clock);
> void intel_snps_phy_ddi_vswing_sequence(struct intel_encoder *encoder,
> - u32 level);
> + const struct intel_crtc_state *crtc_state,
> + int level);
>
> #endif /* __INTEL_SNPS_PHY_H__ */
> --
> 2.20.1
>
--
Matt Roper
Graphics Software Engineer
VTT-OSGC Platform Enablement
Intel Corporation
(916) 356-2795
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