FAILED: patch "[PATCH] drm/amd/display: Program CURSOR_DST_X_OFFSET in viewport" failed to apply to 6.6-stable tree

[<gregkh@linuxfoundation.org>]

The patch below does not apply to the 6.6-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.6.y
git checkout FETCH_HEAD
git cherry-pick -x e1e75cf7334c0e31f4c37d715b964784d45685fa
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2024081205-caucus-fruit-5918@gregkh' --subject-prefix 'PATCH 6.6.y' HEAD^..

Possible dependencies:

e1e75cf7334c ("drm/amd/display: Program CURSOR_DST_X_OFFSET in viewport space")
ee8287e068a3 ("drm/amd/display: Fix cursor issues with ODMs and HW rotations")
319d4615518c ("drm/amd/display: mirror case cleanup for cursors")
dd9d8c61ccff ("drm/amd/display: Minor cleanup for DCN401 cursor related code")
ed79ab5a07c1 ("drm/amd/display: DCN401 cusor code update")
827416d45476 ("drm/amd/display: Fix multiple cursors when using 4 displays on a contiguous large surface")
c2edec1676ca ("drm/amd/display: Fix incorrect cursor position for dcn401")
44b9a7cfc035 ("drm/amd/display: Fix ODM + underscan case with cursor")
70839da63605 ("drm/amd/display: Add new DCN401 sources")

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From e1e75cf7334c0e31f4c37d715b964784d45685fa Mon Sep 17 00:00:00 2001
From: Alvin Lee <alvin.lee2@amd.com>
Date: Thu, 13 Jun 2024 16:10:16 -0400
Subject: [PATCH] drm/amd/display: Program CURSOR_DST_X_OFFSET in viewport
 space

[WHAT & HOW]
According to register specifications, the CURSOR_DST_X_OFFSET
is relative to the start of the data viewport, not RECOUT space.
In this case we must transform the cursor coordinates passed to
hubp401_cursor_set_position into viewport space to program this
register. This fixes an underflow issue that occurs in scaled
mode with low refresh rate.

Reviewed-by: Nevenko Stupar <nevenko.stupar@amd.com>
Cc: Mario Limonciello <mario.limonciello@amd.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Signed-off-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Alvin Lee <alvin.lee2@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/display/dc/hubp/dcn401/dcn401_hubp.c b/drivers/gpu/drm/amd/display/dc/hubp/dcn401/dcn401_hubp.c
index a893160ae775..3f9ca9b40949 100644
--- a/drivers/gpu/drm/amd/display/dc/hubp/dcn401/dcn401_hubp.c
+++ b/drivers/gpu/drm/amd/display/dc/hubp/dcn401/dcn401_hubp.c
@@ -656,7 +656,9 @@ void hubp401_cursor_set_position(
 	int y_pos = pos->y - param->recout.y;
 	int rec_x_offset = x_pos - pos->x_hotspot;
 	int rec_y_offset = y_pos - pos->y_hotspot;
-	uint32_t dst_x_offset;
+	int dst_x_offset;
+	int x_pos_viewport = x_pos * param->viewport.width / param->recout.width;
+	int x_hot_viewport = pos->x_hotspot * param->viewport.width / param->recout.width;
 	uint32_t cur_en = pos->enable ? 1 : 0;
 
 	hubp->curs_pos = *pos;
@@ -668,7 +670,13 @@ void hubp401_cursor_set_position(
 	if (hubp->curs_attr.address.quad_part == 0)
 		return;
 
-	dst_x_offset = (rec_x_offset >= 0) ? rec_x_offset : 0;
+	/* Translate the x position of the cursor from rect
+	 * space into viewport space. CURSOR_DST_X_OFFSET
+	 * is the offset relative to viewport start position.
+	 */
+	dst_x_offset = x_pos_viewport - x_hot_viewport *
+			(1 + hubp->curs_attr.attribute_flags.bits.ENABLE_MAGNIFICATION);
+	dst_x_offset = (dst_x_offset >= 0) ? dst_x_offset : 0;
 	dst_x_offset *= param->ref_clk_khz;
 	dst_x_offset /= param->pixel_clk_khz;