From: Tanmay Shah <tanmay@codeaurora.org>
To: robh+dt@kernel.org, swboyd@chromium.org, sam@ravnborg.org
Cc: devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-arm-msm@vger.kernel.org, dri-devel@lists.freedesktop.org,
freedreno@lists.freedesktop.org, seanpaul@chromium.org,
robdclark@gmail.com, daniel@ffwll.ch, airlied@linux.ie,
aravindh@codeaurora.org, abhinavk@codeaurora.org,
chandanu@codeaurora.org, varar@codeaurora.org,
Tanmay Shah <tanmay@codeaurora.org>,
Jani Nikula <jani.nikula@intel.com>
Subject: [PATCH v8 2/6] drm: add constant N value in helper file
Date: Tue, 30 Jun 2020 11:45:03 -0700 [thread overview]
Message-ID: <20200630184507.15589-3-tanmay@codeaurora.org> (raw)
In-Reply-To: <20200630184507.15589-1-tanmay@codeaurora.org>
From: Chandan Uddaraju <chandanu@codeaurora.org>
The constant N value (0x8000) is used by i915 DP
driver. Define this value in dp helper header file
to use in multiple Display Port drivers. Change
i915 driver accordingly.
Change in v6: Change commit message
Signed-off-by: Chandan Uddaraju <chandanu@codeaurora.org>
Signed-off-by: Vara Reddy <varar@codeaurora.org>
Signed-off-by: Tanmay Shah <tanmay@codeaurora.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Acked-by: Jani Nikula <jani.nikula@intel.com>
---
drivers/gpu/drm/i915/display/intel_display.c | 2 +-
include/drm/drm_dp_helper.h | 1 +
2 files changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index c1836095ea38..81c461aeb3ba 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -8085,7 +8085,7 @@ static void compute_m_n(unsigned int m, unsigned int n,
* which the devices expect also in synchronous clock mode.
*/
if (constant_n)
- *ret_n = 0x8000;
+ *ret_n = DP_LINK_CONSTANT_N_VALUE;
else
*ret_n = min_t(unsigned int, roundup_pow_of_two(n), DATA_LINK_N_MAX);
diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h
index 1165ec105638..73dae5bd6048 100644
--- a/include/drm/drm_dp_helper.h
+++ b/include/drm/drm_dp_helper.h
@@ -1134,6 +1134,7 @@
#define DP_MST_PHYSICAL_PORT_0 0
#define DP_MST_LOGICAL_PORT_0 8
+#define DP_LINK_CONSTANT_N_VALUE 0x8000
#define DP_LINK_STATUS_SIZE 6
bool drm_dp_channel_eq_ok(const u8 link_status[DP_LINK_STATUS_SIZE],
int lane_count);
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project
next prev parent reply other threads:[~2020-06-30 18:46 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-30 18:45 [PATCH v8 0/6] Add support for DisplayPort driver on SnapDragon Tanmay Shah
2020-06-30 18:45 ` [PATCH v8 1/6] dt-bindings: msm/dp: add bindings of DP/DP-PLL driver for Snapdragon Tanmay Shah
2020-06-30 18:45 ` Tanmay Shah [this message]
2020-06-30 18:45 ` [PATCH v8 4/6] drm/msm/dp: add support for DP PLL driver Tanmay Shah
2020-06-30 18:45 ` [PATCH v8 5/6] drm/msm/dpu: add display port support in DPU Tanmay Shah
2020-06-30 18:45 ` [PATCH v8 6/6] drm/msm/dp: Add Display Port HPD feature Tanmay Shah
2020-07-09 20:21 ` [PATCH v8 0/6] Add support for DisplayPort driver on SnapDragon Rob Herring
2020-07-10 17:07 ` tanmay
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