[PATCH 4.17 047/324] drm/arm/malidp: Preserve LAYER_FORMAT contents when setting format

Greg Kroah-Hartman
2018-08-23T08:41:16Z

From: Ayan Kumar Halder <ayan.halder@arm.com>

[ Upstream commit ad7fda2e378f4356df621a39655f7c200b495d81 ]

On some Mali-DP processors, the LAYER_FORMAT register contains fields
other than the format. These bits were unconditionally cleared when
setting the pixel format, whereas they should be preserved at their
reset values.

Reported-by: Brian Starkey <brian.starkey@arm.com>
Reported-by: Liviu Dudau <liviu.dudau@arm.com>
Signed-off-by: Ayan Kumar halder <ayan.halder@arm.com>
Acked-by: Liviu Dudau <liviu.dudau@arm.com>
Signed-off-by: Liviu Dudau <liviu.dudau@arm.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/gpu/drm/arm/malidp_planes.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

--- a/drivers/gpu/drm/arm/malidp_planes.c
+++ b/drivers/gpu/drm/arm/malidp_planes.c
@@ -23,6 +23,7 @@

/* Layer specific register offsets */
#define MALIDP_LAYER_FORMAT 0x000
+#define LAYER_FORMAT_MASK 0x3f
#define MALIDP_LAYER_CONTROL 0x004
#define LAYER_ENABLE (1 << 0)
#define LAYER_FLOWCFG_MASK 7
@@ -337,7 +338,9 @@ static void malidp_de_plane_update(struc
dest_w = plane->state->crtc_w;
dest_h = plane->state->crtc_h;

- malidp_hw_write(mp->hwdev, ms->format, mp->layer->base);
+ val = malidp_hw_read(mp->hwdev, mp->layer->base);
+ val = (val & ~LAYER_FORMAT_MASK) | ms->format;
+ malidp_hw_write(mp->hwdev, val, mp->layer->base);

for (i = 0; i < ms->n_planes; i++) {
/* calculate the offset for the layer's plane registers */