From: Roman Li Roman.Li@amd.com
commit 55eea8ef98641f6e1e1c202bd3a49a57c1dd4059 upstream.
[Why] Some monitors exhibit corruption at 16bpp DSC.
[How] - Add helpers for patching edid caps. - Use it for limiting DSC target bitrate to 15bpp for known monitors
Reviewed-by: Rodrigo Siqueira Rodrigo.Siqueira@amd.com Acked-by: Qingqing Zhuo qingqing.zhuo@amd.com Signed-off-by: Roman Li Roman.Li@amd.com Cc: stable@vger.kernel.org Tested-by: Daniel Wheeler Daniel.Wheeler@amd.com Signed-off-by: Alex Deucher alexander.deucher@amd.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c | 35 ++++++++++++++ 1 file changed, 35 insertions(+)
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c @@ -40,6 +40,39 @@
#include "dm_helpers.h"
+struct monitor_patch_info { + unsigned int manufacturer_id; + unsigned int product_id; + void (*patch_func)(struct dc_edid_caps *edid_caps, unsigned int param); + unsigned int patch_param; +}; +static void set_max_dsc_bpp_limit(struct dc_edid_caps *edid_caps, unsigned int param); + +static const struct monitor_patch_info monitor_patch_table[] = { +{0x6D1E, 0x5BBF, set_max_dsc_bpp_limit, 15}, +{0x6D1E, 0x5B9A, set_max_dsc_bpp_limit, 15}, +}; + +static void set_max_dsc_bpp_limit(struct dc_edid_caps *edid_caps, unsigned int param) +{ + if (edid_caps) + edid_caps->panel_patch.max_dsc_target_bpp_limit = param; +} + +static int amdgpu_dm_patch_edid_caps(struct dc_edid_caps *edid_caps) +{ + int i, ret = 0; + + for (i = 0; i < ARRAY_SIZE(monitor_patch_table); i++) + if ((edid_caps->manufacturer_id == monitor_patch_table[i].manufacturer_id) + && (edid_caps->product_id == monitor_patch_table[i].product_id)) { + monitor_patch_table[i].patch_func(edid_caps, monitor_patch_table[i].patch_param); + ret++; + } + + return ret; +} + /* dm_helpers_parse_edid_caps * * Parse edid caps @@ -125,6 +158,8 @@ enum dc_edid_status dm_helpers_parse_edi kfree(sads); kfree(sadb);
+ amdgpu_dm_patch_edid_caps(edid_caps); + return result; }