e7ec3ae165
Acer Aspire 1 is an WoA aarch64 laptop. This commit introduces support for it by including some patches that were already accepted upstream.
64 lines
2.2 KiB
Diff
64 lines
2.2 KiB
Diff
From c093d7dee08532d3171fab9308939308441944ea Mon Sep 17 00:00:00 2001
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From: Nikita Travkin <nikita@trvn.ru>
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Date: Sat, 8 Apr 2023 13:20:14 +0500
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Subject: [PATCH 2/5] drm/bridge: ti-sn65dsi86: Implement wait_hpd_asserted
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This bridge doesn't actually implement HPD due to it being way too slow
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but instead expects the panel driver to wait enough to assume HPD is
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asserted. However some panels (such as the generic 'edp-panel') expect
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the bridge to deal with the delay and pass maximum delay to the aux
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instead.
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In order to support such panels, add a dummy implementation of wait
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that would just sleep the maximum delay and assume no failure has
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happened.
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Signed-off-by: Nikita Travkin <nikita@trvn.ru>
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Reviewed-by: Douglas Anderson <dianders@chromium.org>
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Signed-off-by: Douglas Anderson <dianders@chromium.org>
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Link: https://patchwork.freedesktop.org/patch/msgid/20230408082014.235425-1-nikita@trvn.ru
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---
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drivers/gpu/drm/bridge/ti-sn65dsi86.c | 19 +++++++++++++++++++
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1 file changed, 19 insertions(+)
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diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi86.c b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
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index b89f7f7ca188..60930d35ea50 100644
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--- a/drivers/gpu/drm/bridge/ti-sn65dsi86.c
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+++ b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
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@@ -631,6 +631,24 @@ static ssize_t ti_sn_aux_transfer(struct drm_dp_aux *aux,
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return len;
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}
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+static int ti_sn_aux_wait_hpd_asserted(struct drm_dp_aux *aux, unsigned long wait_us)
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+{
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+ /*
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+ * The HPD in this chip is a bit useless (See comment in
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+ * ti_sn65dsi86_enable_comms) so if our driver is expected to wait
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+ * for HPD, we just assume it's asserted after the wait_us delay.
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+ *
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+ * In case we are asked to wait forever (wait_us=0) take conservative
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+ * 500ms delay.
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+ */
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+ if (wait_us == 0)
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+ wait_us = 500000;
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+
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+ usleep_range(wait_us, wait_us + 1000);
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+
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+ return 0;
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+}
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+
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static int ti_sn_aux_probe(struct auxiliary_device *adev,
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const struct auxiliary_device_id *id)
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{
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@@ -640,6 +658,7 @@ static int ti_sn_aux_probe(struct auxiliary_device *adev,
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pdata->aux.name = "ti-sn65dsi86-aux";
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pdata->aux.dev = &adev->dev;
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pdata->aux.transfer = ti_sn_aux_transfer;
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+ pdata->aux.wait_hpd_asserted = ti_sn_aux_wait_hpd_asserted;
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drm_dp_aux_init(&pdata->aux);
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ret = devm_of_dp_aux_populate_ep_devices(&pdata->aux);
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--
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2.41.0
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