drm/ast: Set DDC timeout in milliseconds

Compute the i2c timeout in jiffies from a value in milliseconds. The
original values of 2 jiffies equals 2 milliseconds if HZ has been
configured to a value of 1000. This corresponds to 2.2 milliseconds
used by most other DRM drivers. Update ast accordingly.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Fixes: 312fec1405dd ("drm: Initial KMS driver for AST (ASpeed Technologies) 2000 series (v2)")
Cc: Dave Airlie <airlied@redhat.com>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Maxime Ripard <mripard@kernel.org>
Cc: Thomas Zimmermann <tzimmermann@suse.de>
Cc: Jocelyn Falempe <jfalempe@redhat.com>
Cc: dri-devel@lists.freedesktop.org
Cc: <stable@vger.kernel.org> # v3.5+
Reviewed-by: Jocelyn Falempe <jfalempe@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240403103325.30457-2-tzimmermann@suse.de

diff --git a/drivers/gpu/drm/ast/ast_ddc.c b/drivers/gpu/drm/ast/ast_ddc.c
index b7718084422f3b101636b88e1b9a117bc325dc24..3e156a6b6831d398b09842c784e76676ef3a706c 100644 (file)
--- a/drivers/gpu/drm/ast/ast_ddc.c
+++ b/drivers/gpu/drm/ast/ast_ddc.c
@@ -153,7 +153,7 @@ struct ast_ddc *ast_ddc_create(struct ast_device *ast)
 
        bit = &ddc->bit;
        bit->udelay = 20;
-       bit->timeout = 2;
+       bit->timeout = usecs_to_jiffies(2200);
        bit->data = ddc;
        bit->setsda = ast_ddc_algo_bit_data_setsda;
        bit->setscl = ast_ddc_algo_bit_data_setscl;