From: Maxime Ripard Date: Mon, 11 Jan 2021 14:23:00 +0000 (+0100) Subject: drm/vc4: hdmi: Compute the CEC clock divider from the clock rate X-Git-Tag: baikal/aarch64/sdk6.1~7223^2~2^2~23 X-Git-Url: https://git.baikalelectronics.ru/sdk/?a=commitdiff_plain;h=889f390bd5c966f7289a34c80e6cf1401b009949;p=kernel.git drm/vc4: hdmi: Compute the CEC clock divider from the clock rate The CEC clock divider needs to output a frequency of 40kHz from the HSM rate on the BCM2835. The driver used to have a fixed frequency for it, but that changed for the BCM2711 and we now need to compute it dynamically to maintain the proper rate. Fixes: f1fcd1a41666 ("drm/vc4: hdmi: Adjust HSM clock rate depending on pixel rate") Reviewed-by: Dave Stevenson Signed-off-by: Maxime Ripard Acked-by: Hans Verkuil Tested-by: Hans Verkuil Link: https://patchwork.freedesktop.org/patch/msgid/20210111142309.193441-7-maxime@cerno.tech (cherry picked from commit f1ceb9d10043683b89e5e5e5848fb4e855295762) Signed-off-by: Maarten Lankhorst --- diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c index df2c05f2e20c1..cf4b5f5ff7660 100644 --- a/drivers/gpu/drm/vc4/vc4_hdmi.c +++ b/drivers/gpu/drm/vc4/vc4_hdmi.c @@ -1599,6 +1599,7 @@ static int vc4_hdmi_cec_init(struct vc4_hdmi *vc4_hdmi) { struct cec_connector_info conn_info; struct platform_device *pdev = vc4_hdmi->pdev; + u16 clk_cnt; u32 value; int ret; @@ -1624,8 +1625,9 @@ static int vc4_hdmi_cec_init(struct vc4_hdmi *vc4_hdmi) * divider: the hsm_clock rate and this divider setting will * give a 40 kHz CEC clock. */ + clk_cnt = clk_get_rate(vc4_hdmi->hsm_clock) / CEC_CLOCK_FREQ; value |= VC4_HDMI_CEC_ADDR_MASK | - (4091 << VC4_HDMI_CEC_DIV_CLK_CNT_SHIFT); + (clk_cnt << VC4_HDMI_CEC_DIV_CLK_CNT_SHIFT); HDMI_WRITE(HDMI_CEC_CNTRL_1, value); ret = devm_request_threaded_irq(&pdev->dev, platform_get_irq(pdev, 0), vc4_cec_irq_handler,