On Tue, Oct 30, 2018 at 4:24 AM Y.C. Chen yacheng600221@gmail.com wrote:
From: "Y.C. Chen" yc_chen@aspeedtech.com
over-sample data to increase the stability with some specific monitors
Signed-off-by: Y.C. Chen yc_chen@aspeedtech.com
drivers/gpu/drm/ast/ast_mode.c | 32 ++++++++++++++++++++++++++------ 1 file changed, 26 insertions(+), 6 deletions(-)
diff --git a/drivers/gpu/drm/ast/ast_mode.c b/drivers/gpu/drm/ast/ast_mode.c index 5e77d45..22e80c0 100644 --- a/drivers/gpu/drm/ast/ast_mode.c +++ b/drivers/gpu/drm/ast/ast_mode.c @@ -972,9 +972,19 @@ static int get_clock(void *i2c_priv) { struct ast_i2c_chan *i2c = i2c_priv; struct ast_private *ast = i2c->dev->dev_private;
uint32_t val;
volatile uint32_t val, val2, count;count = 0;val = (ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xb7, 0x10) >> 4) & 0x01;do {val2 = (ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xb7, 0x10) >> 4) & 0x01;if (val == val2) count++;else {count = 0;val = (ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xb7, 0x10) >> 4) & 0x01;}} while (count < 5);
This can lead to an infinite loop if there's no stable output, no? I think those are frowned upon in the kernel...
Cheers,
-ilia