Minor Arm fixes
This commit is contained in:
Peter Robinson
parent
51a54393e9
commit
76c7367ad0
196
drm-enable-uncached-DMA-optimization-for-ARM-and-arm64.patch
Normal file
196
drm-enable-uncached-DMA-optimization-for-ARM-and-arm64.patch
Normal file
@ -0,0 +1,196 @@
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From: Ard Biesheuvel <ard.biesheuvel@linaro.org>
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To: linux-kernel@vger.kernel.org
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Subject: [PATCH] drm: enable uncached DMA optimization for ARM and arm64
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Date: Thu, 24 Jan 2019 13:06:58 +0100
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The DRM driver stack is designed to work with cache coherent devices
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only, but permits an optimization to be enabled in some cases, where
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for some buffers, both the CPU and the GPU use uncached mappings,
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removing the need for DMA snooping and allocation in the CPU caches.
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The use of uncached GPU mappings relies on the correct implementation
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of the PCIe NoSnoop TLP attribute by the platform, otherwise the GPU
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will use cached mappings nonetheless. On x86 platforms, this does not
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seem to matter, as uncached CPU mappings will snoop the caches in any
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case. However, on ARM and arm64, enabling this optimization on a
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platform where NoSnoop is ignored results in loss of coherency, which
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breaks correct operation of the device. Since we have no way of
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detecting whether NoSnoop works or not, just disable this
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optimization entirely for ARM and arm64.
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||||
|
||||
Cc: Christian Koenig <christian.koenig@amd.com>
|
||||
Cc: Alex Deucher <alexander.deucher@amd.com>
|
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Cc: David Zhou <David1.Zhou@amd.com>
|
||||
Cc: Huang Rui <ray.huang@amd.com>
|
||||
Cc: Junwei Zhang <Jerry.Zhang@amd.com>
|
||||
Cc: Michel Daenzer <michel.daenzer@amd.com>
|
||||
Cc: David Airlie <airlied@linux.ie>
|
||||
Cc: Daniel Vetter <daniel@ffwll.ch>
|
||||
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
|
||||
Cc: Maxime Ripard <maxime.ripard@bootlin.com>
|
||||
Cc: Sean Paul <sean@poorly.run>
|
||||
Cc: Michael Ellerman <mpe@ellerman.id.au>
|
||||
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
|
||||
Cc: Will Deacon <will.deacon@arm.com>
|
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Cc: Christoph Hellwig <hch@infradead.org>
|
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Cc: Robin Murphy <robin.murphy@arm.com>
|
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Cc: amd-gfx list <amd-gfx@lists.freedesktop.org>
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Cc: dri-devel <dri-devel@lists.freedesktop.org>
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Reported-by: Carsten Haitzler <Carsten.Haitzler@arm.com>
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Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
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Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
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---
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include/drm/drm_cache.h | 18 ++++++++++++++++++
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1 file changed, 18 insertions(+)
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diff --git a/include/drm/drm_cache.h b/include/drm/drm_cache.h
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index bfe1639df02d..97fc498dc767 100644
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--- a/include/drm/drm_cache.h
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+++ b/include/drm/drm_cache.h
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@@ -47,6 +47,24 @@ static inline bool drm_arch_can_wc_memory(void)
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return false;
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#elif defined(CONFIG_MIPS) && defined(CONFIG_CPU_LOONGSON3)
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return false;
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+#elif defined(CONFIG_ARM) || defined(CONFIG_ARM64)
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+ /*
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+ * The DRM driver stack is designed to work with cache coherent devices
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+ * only, but permits an optimization to be enabled in some cases, where
|
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+ * for some buffers, both the CPU and the GPU use uncached mappings,
|
||||
+ * removing the need for DMA snooping and allocation in the CPU caches.
|
||||
+ *
|
||||
+ * The use of uncached GPU mappings relies on the correct implementation
|
||||
+ * of the PCIe NoSnoop TLP attribute by the platform, otherwise the GPU
|
||||
+ * will use cached mappings nonetheless. On x86 platforms, this does not
|
||||
+ * seem to matter, as uncached CPU mappings will snoop the caches in any
|
||||
+ * case. However, on ARM and arm64, enabling this optimization on a
|
||||
+ * platform where NoSnoop is ignored results in loss of coherency, which
|
||||
+ * breaks correct operation of the device. Since we have no way of
|
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+ * detecting whether NoSnoop works or not, just disable this
|
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+ * optimization entirely for ARM and arm64.
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+ */
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+ return false;
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#else
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return true;
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#endif
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@ -576,6 +576,12 @@ Patch305: qcom-msm89xx-fixes.patch
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# https://patchwork.kernel.org/project/linux-mmc/list/?submitter=71861
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Patch306: arm-sdhci-esdhc-imx-fixes.patch
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# https://patchwork.kernel.org/patch/10765783/
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Patch307: wlcore-sdio-Fixup-power-on-off-sequence.patch
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# https://patchwork.kernel.org/patch/10778815/
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Patch308: drm-enable-uncached-DMA-optimization-for-ARM-and-arm64.patch
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# Initall support for the 3A+
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Patch330: bcm2837-dts-add-Raspberry-Pi-3-A.patch
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|
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|
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161
wlcore-sdio-Fixup-power-on-off-sequence.patch
Normal file
161
wlcore-sdio-Fixup-power-on-off-sequence.patch
Normal file
@ -0,0 +1,161 @@
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From patchwork Wed Jan 16 11:37:23 2019
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FXErvZDhVCsQSfNn/eJnmK5Zq0rkuSY=
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||||
X-Google-Smtp-Source:
|
||||
ALg8bN4GExvNSUhrn1ThdHo4TWGq9deM7EiNDhwBHUXk+6BhziaXs9EaV54O4+YG3vKLHV5hZLkJyg==
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X-Received: by 2002:a2e:6503:: with SMTP id
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z3-v6mr6194730ljb.153.1547638653812;
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Wed, 16 Jan 2019 03:37:33 -0800 (PST)
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||||
Received: from localhost.localdomain (h-158-174-22-210.NA.cust.bahnhof.se.
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[158.174.22.210])
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by smtp.gmail.com with ESMTPSA id
|
||||
f11sm1144237lfi.12.2019.01.16.03.37.32
|
||||
(version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128);
|
||||
Wed, 16 Jan 2019 03:37:33 -0800 (PST)
|
||||
From: Ulf Hansson <ulf.hansson@linaro.org>
|
||||
To: Kalle Valo <kvalo@codeaurora.org>,
|
||||
Tony Lindgren <tony@atomide.com>, Eyal Reizer <eyalr@ti.com>,
|
||||
linux-wireless@vger.kernel.org
|
||||
Cc: Ricardo Salveti <rsalveti@rsalveti.net>,
|
||||
Kishon Vijay Abraham I <kishon@ti.com>,
|
||||
Anders Roxell <anders.roxell@linaro.org>,
|
||||
John Stultz <john.stultz@linaro.org>,
|
||||
Jan Kiszka <jan.kiszka@web.de>,
|
||||
Ulf Hansson <ulf.hansson@linaro.org>,
|
||||
linux-kernel@vger.kernel.org, linux-omap@vger.kernel.org
|
||||
Subject: [PATCH V2] wlcore: sdio: Fixup power on/off sequence
|
||||
Date: Wed, 16 Jan 2019 12:37:23 +0100
|
||||
Message-Id: <20190116113723.15668-1-ulf.hansson@linaro.org>
|
||||
X-Mailer: git-send-email 2.17.1
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Sender: linux-omap-owner@vger.kernel.org
|
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Precedence: bulk
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List-ID: <linux-omap.vger.kernel.org>
|
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X-Mailing-List: linux-omap@vger.kernel.org
|
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X-Virus-Scanned: ClamAV using ClamSMTP
|
||||
|
||||
During "wlan-up", we are programming the FW into the WiFi-chip. However,
|
||||
re-programming the FW doesn't work, unless a power cycle of the WiFi-chip
|
||||
is made in-between the programmings.
|
||||
|
||||
To conform to this requirement and to fix the regression in a simple way,
|
||||
let's start by allowing that the SDIO card (WiFi-chip) may stay powered on
|
||||
(runtime resumed) when wl12xx_sdio_power_off() returns. The intent with the
|
||||
current code is to treat this scenario as an error, but unfortunate this
|
||||
doesn't work as expected, so let's fix this.
|
||||
|
||||
The other part is to guarantee that a power cycle of the SDIO card has been
|
||||
completed when wl12xx_sdio_power_on() returns, as to allow the FW
|
||||
programming to succeed. However, relying solely on runtime PM to deal with
|
||||
this isn't sufficient. For example, userspace may prevent runtime suspend
|
||||
via sysfs for the device that represents the SDIO card, leading to that the
|
||||
mmc core also keeps it powered on. For this reason, let's instead do a
|
||||
brute force power cycle in wl12xx_sdio_power_on().
|
||||
|
||||
Fixes: 728a9dc61f13 ("wlcore: sdio: Fix flakey SDIO runtime PM handling")
|
||||
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
|
||||
Tested-by: Tony Lindgren <tony@atomide.com>
|
||||
Tested-by: Anders Roxell <anders.roxell@linaro.org>
|
||||
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
|
||||
---
|
||||
|
||||
Changes in v2:
|
||||
- Keep the SDIO host claimed when calling mmc_hw_reset().
|
||||
- Add a fixes tag.
|
||||
---
|
||||
drivers/net/wireless/ti/wlcore/sdio.c | 15 +++++++--------
|
||||
1 file changed, 7 insertions(+), 8 deletions(-)
|
||||
|
||||
diff --git a/drivers/net/wireless/ti/wlcore/sdio.c b/drivers/net/wireless/ti/wlcore/sdio.c
|
||||
index bd10165d7eec..4d4b07701149 100644
|
||||
--- a/drivers/net/wireless/ti/wlcore/sdio.c
|
||||
+++ b/drivers/net/wireless/ti/wlcore/sdio.c
|
||||
@@ -164,6 +164,12 @@ static int wl12xx_sdio_power_on(struct wl12xx_sdio_glue *glue)
|
||||
}
|
||||
|
||||
sdio_claim_host(func);
|
||||
+ /*
|
||||
+ * To guarantee that the SDIO card is power cycled, as required to make
|
||||
+ * the FW programming to succeed, let's do a brute force HW reset.
|
||||
+ */
|
||||
+ mmc_hw_reset(card->host);
|
||||
+
|
||||
sdio_enable_func(func);
|
||||
sdio_release_host(func);
|
||||
|
||||
@@ -174,20 +180,13 @@ static int wl12xx_sdio_power_off(struct wl12xx_sdio_glue *glue)
|
||||
{
|
||||
struct sdio_func *func = dev_to_sdio_func(glue->dev);
|
||||
struct mmc_card *card = func->card;
|
||||
- int error;
|
||||
|
||||
sdio_claim_host(func);
|
||||
sdio_disable_func(func);
|
||||
sdio_release_host(func);
|
||||
|
||||
/* Let runtime PM know the card is powered off */
|
||||
- error = pm_runtime_put(&card->dev);
|
||||
- if (error < 0 && error != -EBUSY) {
|
||||
- dev_err(&card->dev, "%s failed: %i\n", __func__, error);
|
||||
-
|
||||
- return error;
|
||||
- }
|
||||
-
|
||||
+ pm_runtime_put(&card->dev);
|
||||
return 0;
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user