drm/amd/display: Check if registers are available before accessing

Check if VERT_FILTER_INIT_BOT and BLACK_OFFSET registers
exists in the DCN SCL IP block before trying to access.

Signed-off-by: Eric Bernstein <eric.bernstein@amd.com>
Reviewed-by: Dmytro Laktyushkin <Dmytro.Laktyushkin@amd.com>
Acked-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_dpp_dscl.c b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_dpp_dscl.c
index 4a863a5..c7642e7 100644 (file)
--- a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_dpp_dscl.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_dpp_dscl.c
@@ -597,11 +597,13 @@ static void dpp1_dscl_set_manual_ratio_init(
                SCL_V_INIT_FRAC, init_frac,
                SCL_V_INIT_INT, init_int);
 
-       init_frac = dc_fixpt_u0d19(data->inits.v_bot) << 5;
-       init_int = dc_fixpt_floor(data->inits.v_bot);
-       REG_SET_2(SCL_VERT_FILTER_INIT_BOT, 0,
-               SCL_V_INIT_FRAC_BOT, init_frac,
-               SCL_V_INIT_INT_BOT, init_int);
+       if (REG(SCL_VERT_FILTER_INIT_BOT)) {
+               init_frac = dc_fixpt_u0d19(data->inits.v_bot) << 5;
+               init_int = dc_fixpt_floor(data->inits.v_bot);
+               REG_SET_2(SCL_VERT_FILTER_INIT_BOT, 0,
+                       SCL_V_INIT_FRAC_BOT, init_frac,
+                       SCL_V_INIT_INT_BOT, init_int);
+       }
 
        init_frac = dc_fixpt_u0d19(data->inits.v_c) << 5;
        init_int = dc_fixpt_floor(data->inits.v_c);
@@ -609,11 +611,13 @@ static void dpp1_dscl_set_manual_ratio_init(
                SCL_V_INIT_FRAC_C, init_frac,
                SCL_V_INIT_INT_C, init_int);
 
-       init_frac = dc_fixpt_u0d19(data->inits.v_c_bot) << 5;
-       init_int = dc_fixpt_floor(data->inits.v_c_bot);
-       REG_SET_2(SCL_VERT_FILTER_INIT_BOT_C, 0,
-               SCL_V_INIT_FRAC_BOT_C, init_frac,
-               SCL_V_INIT_INT_BOT_C, init_int);
+       if (REG(SCL_VERT_FILTER_INIT_BOT_C)) {
+               init_frac = dc_fixpt_u0d19(data->inits.v_c_bot) << 5;
+               init_int = dc_fixpt_floor(data->inits.v_c_bot);
+               REG_SET_2(SCL_VERT_FILTER_INIT_BOT_C, 0,
+                       SCL_V_INIT_FRAC_BOT_C, init_frac,
+                       SCL_V_INIT_INT_BOT_C, init_int);
+       }
 }
 
 
@@ -688,15 +692,17 @@ void dpp1_dscl_set_scaler_manual_scale(
                return;
 
        /* Black offsets */
-       if (ycbcr)
-               REG_SET_2(SCL_BLACK_OFFSET, 0,
-                               SCL_BLACK_OFFSET_RGB_Y, BLACK_OFFSET_RGB_Y,
-                               SCL_BLACK_OFFSET_CBCR, BLACK_OFFSET_CBCR);
-       else
+       if (REG(SCL_BLACK_OFFSET)) {
+               if (ycbcr)
+                       REG_SET_2(SCL_BLACK_OFFSET, 0,
+                                       SCL_BLACK_OFFSET_RGB_Y, BLACK_OFFSET_RGB_Y,
+                                       SCL_BLACK_OFFSET_CBCR, BLACK_OFFSET_CBCR);
+               else
 
-               REG_SET_2(SCL_BLACK_OFFSET, 0,
-                               SCL_BLACK_OFFSET_RGB_Y, BLACK_OFFSET_RGB_Y,
-                               SCL_BLACK_OFFSET_CBCR, BLACK_OFFSET_RGB_Y);
+                       REG_SET_2(SCL_BLACK_OFFSET, 0,
+                                       SCL_BLACK_OFFSET_RGB_Y, BLACK_OFFSET_RGB_Y,
+                                       SCL_BLACK_OFFSET_CBCR, BLACK_OFFSET_RGB_Y);
+       }
 
        /* Manually calculate scale ratio and init values */
        dpp1_dscl_set_manual_ratio_init(dpp, scl_data);