drm/etnaviv: Add module parameter to force PPU flop reset

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.wollny@collabora.com>
Reviewed-by: Christian Gmeiner <cgmeiner@igalia.com>
Tested-by: Marek Vasut <marek.vasut@mailbox.org> # STM32MP255C DHCOS DHSBC
Link: https://patch.msgid.link/20251119164624.9297-6-gert.wollny@collabora.com
Signed-off-by: Christian Gmeiner <cgmeiner@igalia.com>

diff --git a/drivers/gpu/drm/etnaviv/etnaviv_flop_reset.c b/drivers/gpu/drm/etnaviv/etnaviv_flop_reset.c
index 2ae6532a51ab834f7058762bde3e7a3cbde41bdd..58d957ee861d75f9d2325104d077d31d2b8e5f3e 100644 (file)
--- a/drivers/gpu/drm/etnaviv/etnaviv_flop_reset.c
+++ b/drivers/gpu/drm/etnaviv/etnaviv_flop_reset.c
@@ -15,6 +15,9 @@
 
 #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
@@ -150,6 +153,19 @@ 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;
 }