linux-kernel - [RESEND PATCH v7 2/2] drm/tidss: Move OLDI mode validation to OLDI bridge mode

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Message-ID: <20251028033958.369100-3-s-jain1@ti.com>
Date: Tue, 28 Oct 2025 09:09:58 +0530
From: Swamil Jain <s-jain1@...com>
To: <aradhya.bhatia@...ux.dev>, <devarsht@...com>, <mripard@...nel.org>,
        <tomi.valkeinen@...asonboard.com>, <jyri.sarha@....fi>,
        <maarten.lankhorst@...ux.intel.com>, <simona@...ll.ch>,
        <airlied@...il.com>, <tzimmermann@...e.de>, <h-shenoy@...com>
CC: <praneeth@...com>, <u-kumar1@...com>, <vigneshr@...com>,
        <dri-devel@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>,
        <s-jain1@...com>
Subject: [RESEND PATCH v7 2/2] drm/tidss: Move OLDI mode validation to OLDI bridge mode_valid hook

From: Jayesh Choudhary <j-choudhary@...com>

After integrating OLDI support[0], it is necessary to identify which VP
instances use OLDI, since the OLDI driver owns the video port clock
(as a serial clock). Clock operations on these VPs must be delegated to
the OLDI driver, not handled by the TIDSS driver. This issue also
emerged in upstream discussions when DSI-related clock management was
attempted in the TIDSS driver[1].

To address this, add an 'is_ext_vp_clk' array to the 'tidss_device'
structure, marking a VP as 'true' during 'tidss_oldi_init()' and as
'false' during 'tidss_oldi_deinit()'. TIDSS then uses 'is_ext_vp_clk'
to skip clock validation checks in 'dispc_vp_mode_valid()' for VPs
under OLDI control.

Since OLDI uses the DSS VP clock directly as a serial interface and
manages its own rate, mode validation should be implemented in the OLDI
bridge's 'mode_valid' hook. This patch adds that logic, ensuring proper
delegation and avoiding spurious clock handling in the TIDSS driver.

[0]: https://lore.kernel.org/all/20250528122544.817829-1-aradhya.bhatia@linux.dev/
[1]: https://lore.kernel.org/all/DA6TT575Z82D.3MPK8HG5GRL8U@kernel.org/

Fixes: 7246e0929945 ("drm/tidss: Add OLDI bridge support")
Tested-by: Michael Walle <mwalle@...nel.org>
Reviewed-by: Devarsh Thakkar <devarsht@...com>
Signed-off-by: Jayesh Choudhary <j-choudhary@...com>
Signed-off-by: Swamil Jain <s-jain1@...com>
---
 drivers/gpu/drm/tidss/tidss_dispc.c |  2 ++
 drivers/gpu/drm/tidss/tidss_drv.h   |  2 ++
 drivers/gpu/drm/tidss/tidss_oldi.c  | 21 +++++++++++++++++++++
 3 files changed, 25 insertions(+)

diff --git a/drivers/gpu/drm/tidss/tidss_dispc.c b/drivers/gpu/drm/tidss/tidss_dispc.c
index 07731b02490f..0c3337a7b163 100644
--- a/drivers/gpu/drm/tidss/tidss_dispc.c
+++ b/drivers/gpu/drm/tidss/tidss_dispc.c
@@ -1315,6 +1315,8 @@ static int check_pixel_clock(struct dispc_device *dispc,
 {
 	unsigned long round_clock;
 
+	if (dispc->tidss->is_ext_vp_clk[hw_videoport])
+		return 0;
 	round_clock = clk_round_rate(dispc->vp_clk[hw_videoport], clock);
 	/*
 	 * To keep the check consistent with dispc_vp_set_clk_rate(), we
diff --git a/drivers/gpu/drm/tidss/tidss_drv.h b/drivers/gpu/drm/tidss/tidss_drv.h
index 84454a4855d1..e1c1f41d8b4b 100644
--- a/drivers/gpu/drm/tidss/tidss_drv.h
+++ b/drivers/gpu/drm/tidss/tidss_drv.h
@@ -24,6 +24,8 @@ struct tidss_device {
 
 	const struct dispc_features *feat;
 	struct dispc_device *dispc;
+	bool is_ext_vp_clk[TIDSS_MAX_PORTS];
+
 
 	unsigned int num_crtcs;
 	struct drm_crtc *crtcs[TIDSS_MAX_PORTS];
diff --git a/drivers/gpu/drm/tidss/tidss_oldi.c b/drivers/gpu/drm/tidss/tidss_oldi.c
index 7688251beba2..d1a5fdac93ff 100644
--- a/drivers/gpu/drm/tidss/tidss_oldi.c
+++ b/drivers/gpu/drm/tidss/tidss_oldi.c
@@ -309,6 +309,24 @@ static u32 *tidss_oldi_atomic_get_input_bus_fmts(struct drm_bridge *bridge,
 	return input_fmts;
 }
 
+static enum drm_mode_status
+tidss_oldi_mode_valid(struct drm_bridge *bridge,
+		      const struct drm_display_info *info,
+		      const struct drm_display_mode *mode)
+{
+	struct tidss_oldi *oldi = drm_bridge_to_tidss_oldi(bridge);
+	unsigned long round_clock;
+
+	round_clock = clk_round_rate(oldi->serial, mode->clock * 7 * 1000);
+	/*
+	 * To keep the check consistent with dispc_vp_set_clk_rate(),
+	 * we use the same 5% check here.
+	 */
+	if (dispc_pclk_diff(mode->clock * 7 * 1000, round_clock) > 5)
+		return -EINVAL;
+	return 0;
+}
+
 static const struct drm_bridge_funcs tidss_oldi_bridge_funcs = {
 	.attach	= tidss_oldi_bridge_attach,
 	.atomic_pre_enable = tidss_oldi_atomic_pre_enable,
@@ -317,6 +335,7 @@ static const struct drm_bridge_funcs tidss_oldi_bridge_funcs = {
 	.atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
 	.atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
 	.atomic_reset = drm_atomic_helper_bridge_reset,
+	.mode_valid = tidss_oldi_mode_valid,
 };
 
 static int get_oldi_mode(struct device_node *oldi_tx, int *companion_instance)
@@ -430,6 +449,7 @@ void tidss_oldi_deinit(struct tidss_device *tidss)
 	for (int i = 0; i < tidss->num_oldis; i++) {
 		if (tidss->oldis[i]) {
 			drm_bridge_remove(&tidss->oldis[i]->bridge);
+			tidss->is_ext_vp_clk[tidss->oldis[i]->parent_vp] = false;
 			tidss->oldis[i] = NULL;
 		}
 	}
@@ -580,6 +600,7 @@ int tidss_oldi_init(struct tidss_device *tidss)
 		oldi->bridge.timings = &default_tidss_oldi_timings;
 
 		tidss->oldis[tidss->num_oldis++] = oldi;
+		tidss->is_ext_vp_clk[oldi->parent_vp] = true;
 		oldi->tidss = tidss;
 
 		drm_bridge_add(&oldi->bridge);