From: Paul Cercueil <paul@crapouillou.net>
To: David Airlie <airlied@linux.ie>, Daniel Vetter <daniel@ffwll.ch>
Cc: Sam Ravnborg <sam@ravnborg.org>,
od@zcrc.me, linux-mips@vger.kernel.org,
dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org,
Paul Cercueil <paul@crapouillou.net>,
stable@vger.kernel.org
Subject: [PATCH] drm/ingenic: Fix pixclock rate for 24-bit serial panels
Date: Tue, 23 Mar 2021 14:40:08 +0000 [thread overview]
Message-ID: <20210323144008.166248-1-paul@crapouillou.net> (raw)
When using a 24-bit panel on a 8-bit serial bus, the pixel clock
requested by the panel has to be multiplied by 3, since the subpixels
are shifted sequentially.
The code (in ingenic_drm_encoder_atomic_check) already computed
crtc_state->adjusted_mode->crtc_clock accordingly, but clk_set_rate()
used crtc_state->adjusted_mode->clock instead.
Fixes: 28ab7d35b6e0 ("drm/ingenic: Properly compute timings when using a 3x8-bit panel")
Cc: stable@vger.kernel.org # v5.10
Signed-off-by: Paul Cercueil <paul@crapouillou.net>
---
drivers/gpu/drm/ingenic/ingenic-drm-drv.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/ingenic/ingenic-drm-drv.c b/drivers/gpu/drm/ingenic/ingenic-drm-drv.c
index d60e1eefc9d1..cba68bf52ec5 100644
--- a/drivers/gpu/drm/ingenic/ingenic-drm-drv.c
+++ b/drivers/gpu/drm/ingenic/ingenic-drm-drv.c
@@ -342,7 +342,7 @@ static void ingenic_drm_crtc_atomic_flush(struct drm_crtc *crtc,
if (priv->update_clk_rate) {
mutex_lock(&priv->clk_mutex);
clk_set_rate(priv->pix_clk,
- crtc_state->adjusted_mode.clock * 1000);
+ crtc_state->adjusted_mode.crtc_clock * 1000);
priv->update_clk_rate = false;
mutex_unlock(&priv->clk_mutex);
}
--
2.30.2
next reply other threads:[~2021-03-23 14:41 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-23 14:40 Paul Cercueil [this message]
2021-04-12 14:34 ` [PATCH] drm/ingenic: Fix pixclock rate for 24-bit serial panels Paul Cercueil
2021-04-12 14:53 ` H. Nikolaus Schaller
2021-05-13 12:29 ` Paul Cercueil
2021-05-14 17:26 ` Thomas Zimmermann
2021-05-17 13:15 ` Daniel Vetter
2021-05-17 14:30 ` Paul Cercueil
2021-05-17 14:37 ` Daniel Vetter
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