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Date: Tue, 18 Jul 2023 07:40:23 +0000
From: CK Hu (胡俊光) <ck.hu@...iatek.com>
To: "angelogioacchino.delregno@...labora.com"
<angelogioacchino.delregno@...labora.com>,
"chunkuang.hu@...nel.org" <chunkuang.hu@...nel.org>
CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-mediatek@...ts.infradead.org"
<linux-mediatek@...ts.infradead.org>,
"wenst@...omium.org" <wenst@...omium.org>,
"kernel@...labora.com" <kernel@...labora.com>,
"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>,
"matthias.bgg@...il.com" <matthias.bgg@...il.com>,
"nfraprado@...labora.com" <nfraprado@...labora.com>
Subject: Re: [PATCH v5 01/10] drm/mediatek: dp: Move AUX and panel poweron/off
sequence to function
Hi, Angelo:
On Thu, 2023-07-13 at 11:01 +0200, AngeloGioacchino Del Regno wrote:
>
> External email : Please do not click links or open attachments until
> you have verified the sender or the content.
> Everytime we run bridge detection and/or EDID read we run a poweron
> and poweroff sequence for both the AUX and the panel; moreover, this
> is also done when enabling the bridge in the .atomic_enable()
> callback.
>
> Move this power on/off sequence to a new mtk_dp_aux_panel_poweron()
> function as to commonize it.
> Note that, before this commit, in mtk_dp_bridge_atomic_enable() only
> the AUX was getting powered on but the panel was left powered off if
> the DP cable wasn't plugged in while now we unconditionally send a D0
> request and this is done for two reasons:
> - First, whether this request fails or not, it takes the same time
> and anyway the DP hardware won't produce any error (or, if it
> does, it's ignorable because it won't block further commands)
> - Second, training the link between a sleeping/standby/unpowered
> display makes little sense.
Reviewed-by: CK Hu <ck.hu@...iatek.com>
>
> Signed-off-by: AngeloGioacchino Del Regno <
> angelogioacchino.delregno@...labora.com>
> Tested-by: Chen-Yu Tsai <wenst@...omium.org>
> ---
> drivers/gpu/drm/mediatek/mtk_dp.c | 76 ++++++++++++-----------------
> --
> 1 file changed, 30 insertions(+), 46 deletions(-)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_dp.c
> b/drivers/gpu/drm/mediatek/mtk_dp.c
> index 64eee77452c0..8b7ded1746f3 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dp.c
> +++ b/drivers/gpu/drm/mediatek/mtk_dp.c
> @@ -1251,6 +1251,29 @@ static void mtk_dp_audio_mute(struct mtk_dp
> *mtk_dp, bool mute)
> val[2], AU_TS_CFG_DP_ENC0_P0_MASK);
> }
>
> +static void mtk_dp_aux_panel_poweron(struct mtk_dp *mtk_dp, bool
> pwron)
> +{
> + if (pwron) {
> + /* power on aux */
> + mtk_dp_update_bits(mtk_dp, MTK_DP_TOP_PWR_STATE,
> + DP_PWR_STATE_BANDGAP_TPLL_LANE,
> + DP_PWR_STATE_MASK);
> +
> + /* power on panel */
> + drm_dp_dpcd_writeb(&mtk_dp->aux, DP_SET_POWER,
> DP_SET_POWER_D0);
> + usleep_range(2000, 5000);
> + } else {
> + /* power off panel */
> + drm_dp_dpcd_writeb(&mtk_dp->aux, DP_SET_POWER,
> DP_SET_POWER_D3);
> + usleep_range(2000, 3000);
> +
> + /* power off aux */
> + mtk_dp_update_bits(mtk_dp, MTK_DP_TOP_PWR_STATE,
> + DP_PWR_STATE_BANDGAP_TPLL,
> + DP_PWR_STATE_MASK);
> + }
> +}
> +
> static void mtk_dp_power_enable(struct mtk_dp *mtk_dp)
> {
> mtk_dp_update_bits(mtk_dp, MTK_DP_TOP_RESET_AND_PROBE,
> @@ -1936,16 +1959,9 @@ static enum drm_connector_status
> mtk_dp_bdg_detect(struct drm_bridge *bridge)
> if (!mtk_dp->train_info.cable_plugged_in)
> return ret;
>
> - if (!enabled) {
> - /* power on aux */
> - mtk_dp_update_bits(mtk_dp, MTK_DP_TOP_PWR_STATE,
> - DP_PWR_STATE_BANDGAP_TPLL_LANE,
> - DP_PWR_STATE_MASK);
> + if (!enabled)
> + mtk_dp_aux_panel_poweron(mtk_dp, true);
>
> - /* power on panel */
> - drm_dp_dpcd_writeb(&mtk_dp->aux, DP_SET_POWER,
> DP_SET_POWER_D0);
> - usleep_range(2000, 5000);
> - }
> /*
> * Some dongles still source HPD when they do not connect to
> any
> * sink device. To avoid this, we need to read the sink count
> @@ -1957,16 +1973,8 @@ static enum drm_connector_status
> mtk_dp_bdg_detect(struct drm_bridge *bridge)
> if (DP_GET_SINK_COUNT(sink_count))
> ret = connector_status_connected;
>
> - if (!enabled) {
> - /* power off panel */
> - drm_dp_dpcd_writeb(&mtk_dp->aux, DP_SET_POWER,
> DP_SET_POWER_D3);
> - usleep_range(2000, 3000);
> -
> - /* power off aux */
> - mtk_dp_update_bits(mtk_dp, MTK_DP_TOP_PWR_STATE,
> - DP_PWR_STATE_BANDGAP_TPLL,
> - DP_PWR_STATE_MASK);
> - }
> + if (!enabled)
> + mtk_dp_aux_panel_poweron(mtk_dp, false);
>
> return ret;
> }
> @@ -1982,15 +1990,7 @@ static struct edid *mtk_dp_get_edid(struct
> drm_bridge *bridge,
>
> if (!enabled) {
> drm_atomic_bridge_chain_pre_enable(bridge, connector-
> >state->state);
> -
> - /* power on aux */
> - mtk_dp_update_bits(mtk_dp, MTK_DP_TOP_PWR_STATE,
> - DP_PWR_STATE_BANDGAP_TPLL_LANE,
> - DP_PWR_STATE_MASK);
> -
> - /* power on panel */
> - drm_dp_dpcd_writeb(&mtk_dp->aux, DP_SET_POWER,
> DP_SET_POWER_D0);
> - usleep_range(2000, 5000);
> + mtk_dp_aux_panel_poweron(mtk_dp, true);
> }
>
> new_edid = drm_get_edid(connector, &mtk_dp->aux.ddc);
> @@ -2010,15 +2010,7 @@ static struct edid *mtk_dp_get_edid(struct
> drm_bridge *bridge,
> }
>
> if (!enabled) {
> - /* power off panel */
> - drm_dp_dpcd_writeb(&mtk_dp->aux, DP_SET_POWER,
> DP_SET_POWER_D3);
> - usleep_range(2000, 3000);
> -
> - /* power off aux */
> - mtk_dp_update_bits(mtk_dp, MTK_DP_TOP_PWR_STATE,
> - DP_PWR_STATE_BANDGAP_TPLL,
> - DP_PWR_STATE_MASK);
> -
> + mtk_dp_aux_panel_poweron(mtk_dp, false);
> drm_atomic_bridge_chain_post_disable(bridge, connector-
> >state->state);
> }
>
> @@ -2178,15 +2170,7 @@ static void mtk_dp_bridge_atomic_enable(struct
> drm_bridge *bridge,
> return;
> }
>
> - /* power on aux */
> - mtk_dp_update_bits(mtk_dp, MTK_DP_TOP_PWR_STATE,
> - DP_PWR_STATE_BANDGAP_TPLL_LANE,
> - DP_PWR_STATE_MASK);
> -
> - if (mtk_dp->train_info.cable_plugged_in) {
> - drm_dp_dpcd_writeb(&mtk_dp->aux, DP_SET_POWER,
> DP_SET_POWER_D0);
> - usleep_range(2000, 5000);
> - }
> + mtk_dp_aux_panel_poweron(mtk_dp, true);
>
> /* Training */
> ret = mtk_dp_training(mtk_dp);
> --
> 2.40.1
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