radeonsi: add option to disable EFC

Signed-off-by: Thong Thai <thong.thai@amd.com>
Reviewed-by: Leo Liu <leo.liu@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/15196>

src/gallium/drivers/radeonsi/si_pipe.c

@@ -92,6 +92,9 @@ static const struct debug_named_value radeonsi_debug_options[] = {
    {"shadowregs", DBG(SHADOW_REGS), "Enable CP register shadowing."},
    {"nofastdlist", DBG(NO_FAST_DISPLAY_LIST), "Disable fast display lists"},
 
+   /* Multimedia options: */
+   { "noefc", DBG(NO_EFC), "Disable hardware based encoder colour format conversion."},
+
    /* 3D engine options: */
    {"nogfx", DBG(NO_GFX), "Disable graphics. Only multimedia compute paths can be used."},
    {"nongg", DBG(NO_NGG), "Disable NGG and use the legacy pipeline."},

src/gallium/drivers/radeonsi/si_pipe.h

@@ -221,6 +221,9 @@ enum
    DBG_SHADOW_REGS,
    DBG_NO_FAST_DISPLAY_LIST,
 
+   /* Multimedia options: */
+   DBG_NO_EFC,
+
    /* 3D engine options: */
    DBG_NO_GFX,
    DBG_NO_NGG,