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drm/ast: Warn about unsupported TX chips

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A number of TX chips are listed in VGACRD1, but not supported by
the ast driver. Whether any existing product uses such a chip is
unknown. Warn if the driver encounters any. We can then add
support as necessary.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Suggested-by: Jocelyn Falempe <jfalempe@redhat.com>
Reviewed-by: Jocelyn Falempe <jfalempe@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240916082920.56234-4-tzimmermann@suse.de
This commit is contained in:
Thomas Zimmermann 2024-09-16 10:25:15 +02:00
parent f93d66635f
commit a5c2320151
1 changed files with 16 additions and 1 deletions
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17
drivers/gpu/drm/ast/ast_main.c
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@ -76,7 +76,22 @@ static void ast_detect_tx_chip(struct ast_device *ast, bool need_post)
};
struct drm_device *dev = &ast->base;
u8 jreg;
u8 jreg, vgacrd1;
/*
* Several of the listed TX chips are not explicitly supported
* by the ast driver. If these exist in real-world devices, they
* are most likely reported as VGA or SIL164 outputs. We warn here
* to get bug reports for these devices. If none come in for some
* time, we can begin to fail device probing on these values.
*/
vgacrd1 = ast_get_index_reg_mask(ast, AST_IO_VGACRI, 0xd1, AST_IO_VGACRD1_TX_TYPE_MASK);
drm_WARN(dev, vgacrd1 == AST_IO_VGACRD1_TX_ITE66121_VBIOS,
"ITE IT66121 detected, 0x%x, Gen%lu\n", vgacrd1, AST_GEN(ast));
drm_WARN(dev, vgacrd1 == AST_IO_VGACRD1_TX_CH7003_VBIOS,
"Chrontel CH7003 detected, 0x%x, Gen%lu\n", vgacrd1, AST_GEN(ast));
drm_WARN(dev, vgacrd1 == AST_IO_VGACRD1_TX_ANX9807_VBIOS,
"Analogix ANX9807 detected, 0x%x, Gen%lu\n", vgacrd1, AST_GEN(ast));
/* Check 3rd Tx option (digital output afaik) */
ast->tx_chip = AST_TX_NONE;