[PATCH v4 5/5] drm/etnaviv: Add module parameter to force PPU flop reset

[gert . wollny]

From: Gert Wollny <gert.wol...@collabora.com>

v2: Check for feature PIPE_3D when forcing PPU flop reset (Lucas)

v3: - drop use of ppu_flop_reset enum (Christian Gmeiner)
    - don't initialize module parameter to zero (checkpatch)
    - avoid multi-line string in warning message (checkpatch)

Signed-off-by: Gert Wollny <gert.wol...@collabora.com>
---
 drivers/gpu/drm/etnaviv/etnaviv_flop_reset.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/drivers/gpu/drm/etnaviv/etnaviv_flop_reset.c 
b/drivers/gpu/drm/etnaviv/etnaviv_flop_reset.c
index 7c0112b3b3ad..75fe8cce1177 100644
--- a/drivers/gpu/drm/etnaviv/etnaviv_flop_reset.c
+++ b/drivers/gpu/drm/etnaviv/etnaviv_flop_reset.c
@@ -13,6 +13,9 @@
 
 #include "etnaviv_flop_reset.h"
 
+static int etnaviv_force_flop_reset;
+module_param_named(force_flop_reset, etnaviv_force_flop_reset, int, 0);
+
 #define PPU_IMAGE_STRIDE 64
 #define PPU_IMAGE_XSIZE 64
 #define PPU_IMAGE_YSIZE 6
@@ -148,6 +151,19 @@ bool etnaviv_flop_reset_ppu_require(const struct 
etnaviv_chip_identity *chip_id)
                        return true;
        }
 
+       if (etnaviv_force_flop_reset) {
+               if (!(chip_id->features & chipFeatures_PIPE_3D)) {
+                       pr_warn("Etnaviv: model: 0x%04x, revision: 0x%04x does 
not support PIPE_3D\n",
+                               chip_id->model, chip_id->revision);
+                       pr_warn("Request to force PPU flop reset ignored.\n");
+                       return false;
+               }
+
+               pr_info("Force PPU flop reset for model: 0x%04x, revision: 
0x%04x\n",
+                       chip_id->model, chip_id->revision);
+               return true;
+       }
+
        return false;
 }
 
-- 
2.51.0