Hi Jocelyn,
On 2023/7/13 下午 04:17, Jocelyn Falempe wrote:
On 13/07/2023 09:00, Jammy Huang wrote:
Hi Jocelyn,
Thanks for your work.
On 2023/7/13 下午 02:40, Jocelyn Falempe wrote:
Aspeed always report the display port as "connected", because it
doesn't set a .detect_ctx callback.
Fix this by providing the proper detect callback for astdp and dp501.
This also fixes the following regression:
Since commit fae7d186403e ("drm/probe-helper: Default to 640x480 if no
EDID on DP") The default resolution is now 640x480 when no monitor is
connected. But Aspeed graphics is mostly used in servers, where no
monitor
is attached. This also affects the remote BMC resolution to 640x480,
which
is inconvenient, and breaks the anaconda installer.
v2: Add .detect callback to the dp/dp501 connector (Jani Nikula)
v3: Use .detect_ctx callback, and refactors (Thomas Zimmermann)
Add a BMC virtual connector
v4: Better indent detect_ctx() functions (Thomas Zimmermann)
v5: Enable polling of the dp and dp501 connector status
(Thomas Zimmermann)
Fixes: fae7d186403e ("drm/probe-helper: Default to 640x480 if no
EDID on DP")
Signed-off-by: Jocelyn Falempe <jfalempe@xxxxxxxxxx>
Reviewed-by: Thomas Zimmermann <tzimmermann@xxxxxxx>
---
drivers/gpu/drm/ast/ast_dp.c | 11 ++++++++++
drivers/gpu/drm/ast/ast_dp501.c | 37
++++++++++++++++++++++-----------
drivers/gpu/drm/ast/ast_drv.h | 2 ++
drivers/gpu/drm/ast/ast_mode.c | 31 +++++++++++++++++++++++++--
4 files changed, 67 insertions(+), 14 deletions(-)
diff --git a/drivers/gpu/drm/ast/ast_dp.c
b/drivers/gpu/drm/ast/ast_dp.c
index 6dc1a09504e1..bf78f3d4aa3f 100644
--- a/drivers/gpu/drm/ast/ast_dp.c
+++ b/drivers/gpu/drm/ast/ast_dp.c
@@ -7,6 +7,17 @@
#include <drm/drm_print.h>
#include "ast_drv.h"
+bool ast_astdp_is_connected(struct ast_device *ast)
+{
+ if (!ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xD1,
ASTDP_MCU_FW_EXECUTING))
+ return false;
+ if (!ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xDC,
ASTDP_LINK_SUCCESS))
+ return false;
+ if (!ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xDF,
ASTDP_HPD))
+ return false;
+ return true;
+}
* ASPDP_LINK_SUCCESS is true, when DP link training is finished. The
DP link quality is good
enough to deliver video data.
* ASTDP_HPD is true, when there is DP sink pull high HPD.
Thus, ASTDP_HPD is the prerequisite of ASTDP_LINK_SUCCESS. I would
suggest to remove
the check for ASTDP_LINK_SUCCESS here. ASTDP_HPD is good enough for
connected status.
If you want to check all these three status, please change the order,
FW_EXECUTING -> HPD ->
LINK_SUCCESS.
Thanks for the detailed explanations.
I looked at other drivers to see if HPD is good enough for "connected"
status, but I didn't find a clear answer.
There is also a drm_link_status, but that looks to be mostly unused.
https://elixir.bootlin.com/linux/latest/source/include/drm/drm_connector.h#L331
So I think I will follow your suggestion, and remove the check for
ASTDP_LINK_SUCCESS.
For the BMC connector patch, you know if there is a register setting I
can check to see if a BMC is present or not ?
I think you can use VGA CRD0[7] whose definition is as below:
DRAM Initial Selection (see note 1)
0: VBIOS Initial the DRAM
1: SOC Firmware Initial the DRAM
If CRD0[7] is 1, there is BMC.
Best regards,
--
Best Regards
Jammy
