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A couple of upstream fixes for Raspberry Pi

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This commit is contained in:
Peter Robinson 2017-06-07 11:40:55 +01:00
parent df3d8e2f95
commit daca4a8819
3 changed files with 282 additions and 0 deletions
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206
bcm2835-clk-audio-jitter-issues.patch Normal file
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@ -0,0 +1,206 @@
From patchwork Thu Jun 1 14:14:16 2017
Content-Type: text/plain; charset="utf-8"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Subject: [v4,1/2] clk: bcm2835: Limit PCM clock to OSC and PLLD_PER
From: Phil Elwell <phil@raspberrypi.org>
X-Patchwork-Id: 9759641
Message-Id: <8cc0ba82-d33e-127b-7b86-ac595ef416d1@raspberrypi.org>
To: Michael Turquette <mturquette@baylibre.com>,
Stephen Boyd <sboyd@codeaurora.org>, Eric Anholt <eric@anholt.net>,
Stefan Wahren <stefan.wahren@i2se.com>,
Florian Fainelli <f.fainelli@gmail.com>,
linux-clk@vger.kernel.org, linux-rpi-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Date: Thu, 1 Jun 2017 15:14:16 +0100
Restrict clock sources for the PCM peripheral to the oscillator and
PLLD_PER because other source may have varying rates or be switched off.
Prevent other sources from being selected by replacing their names in
the list of potential parents with dummy entries (entry index is
significant).
Signed-off-by: Phil Elwell <phil@raspberrypi.org>
Reviewed-by: Eric Anholt <eric@anholt.net>
Acked-by: Stefan Wahren <stefan.wahren@i2se.com>
---
drivers/clk/bcm/clk-bcm2835.c | 27 ++++++++++++++++++++++++++-
1 file changed, 26 insertions(+), 1 deletion(-)
diff --git a/drivers/clk/bcm/clk-bcm2835.c b/drivers/clk/bcm/clk-bcm2835.c
index 0258538..49867d2 100644
--- a/drivers/clk/bcm/clk-bcm2835.c
+++ b/drivers/clk/bcm/clk-bcm2835.c
@@ -1516,6 +1516,31 @@ struct bcm2835_clk_desc {
.parents = bcm2835_clock_per_parents, \
__VA_ARGS__)
+/*
+ * Restrict clock sources for the PCM peripheral to the oscillator and
+ * PLLD_PER because other source may have varying rates or be switched
+ * off.
+ *
+ * Prevent other sources from being selected by replacing their names in
+ * the list of potential parents with dummy entries (entry index is
+ * significant).
+ */
+static const char *const bcm2835_pcm_per_parents[] = {
+ "-",
+ "xosc",
+ "-",
+ "-",
+ "-",
+ "-",
+ "plld_per",
+ "-",
+};
+
+#define REGISTER_PCM_CLK(...) REGISTER_CLK( \
+ .num_mux_parents = ARRAY_SIZE(bcm2835_pcm_per_parents), \
+ .parents = bcm2835_pcm_per_parents, \
+ __VA_ARGS__)
+
/* main vpu parent mux */
static const char *const bcm2835_clock_vpu_parents[] = {
"gnd",
@@ -1993,7 +2018,7 @@ struct bcm2835_clk_desc {
.int_bits = 4,
.frac_bits = 8,
.tcnt_mux = 22),
- [BCM2835_CLOCK_PCM] = REGISTER_PER_CLK(
+ [BCM2835_CLOCK_PCM] = REGISTER_PCM_CLK(
.name = "pcm",
.ctl_reg = CM_PCMCTL,
.div_reg = CM_PCMDIV,
From patchwork Thu Jun 1 14:14:22 2017
Content-Type: text/plain; charset="utf-8"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Subject: [v4,2/2] clk: bcm2835: Minimise clock jitter for PCM clock
From: Phil Elwell <phil@raspberrypi.org>
X-Patchwork-Id: 9759643
Message-Id: <9989244b-ca4d-9081-95d9-b24f51099222@raspberrypi.org>
To: Michael Turquette <mturquette@baylibre.com>,
Stephen Boyd <sboyd@codeaurora.org>, Eric Anholt <eric@anholt.net>,
Stefan Wahren <stefan.wahren@i2se.com>,
Florian Fainelli <f.fainelli@gmail.com>,
linux-clk@vger.kernel.org, linux-rpi-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Date: Thu, 1 Jun 2017 15:14:22 +0100
Fractional clock dividers generate accurate average frequencies but
with jitter, particularly when the integer divisor is small.
Introduce a new metric of clock accuracy to penalise clocks with a good
average but worse jitter compared to clocks with an average which is no
better but with lower jitter. The metric is the ideal rate minus the
worse deviation from that ideal using the nearest integer divisors.
Use this metric for parent selection for clocks requiring low jitter
(currently just PCM).
Signed-off-by: Phil Elwell <phil@raspberrypi.org>
Reviewed-by: Eric Anholt <eric@anholt.net>
Acked-by: Stefan Wahren <stefan.wahren@i2se.com>
---
drivers/clk/bcm/clk-bcm2835.c | 34 +++++++++++++++++++++++++++++-----
1 file changed, 29 insertions(+), 5 deletions(-)
diff --git a/drivers/clk/bcm/clk-bcm2835.c b/drivers/clk/bcm/clk-bcm2835.c
index 49867d2..0bc56a0 100644
--- a/drivers/clk/bcm/clk-bcm2835.c
+++ b/drivers/clk/bcm/clk-bcm2835.c
@@ -530,6 +530,7 @@ struct bcm2835_clock_data {
bool is_vpu_clock;
bool is_mash_clock;
+ bool low_jitter;
u32 tcnt_mux;
};
@@ -1124,7 +1125,8 @@ static unsigned long bcm2835_clock_choose_div_and_prate(struct clk_hw *hw,
int parent_idx,
unsigned long rate,
u32 *div,
- unsigned long *prate)
+ unsigned long *prate,
+ unsigned long *avgrate)
{
struct bcm2835_clock *clock = bcm2835_clock_from_hw(hw);
struct bcm2835_cprman *cprman = clock->cprman;
@@ -1139,8 +1141,25 @@ static unsigned long bcm2835_clock_choose_div_and_prate(struct clk_hw *hw,
*prate = clk_hw_get_rate(parent);
*div = bcm2835_clock_choose_div(hw, rate, *prate, true);
- return bcm2835_clock_rate_from_divisor(clock, *prate,
- *div);
+ *avgrate = bcm2835_clock_rate_from_divisor(clock, *prate, *div);
+
+ if (data->low_jitter && (*div & CM_DIV_FRAC_MASK)) {
+ unsigned long high, low;
+ u32 int_div = *div & ~CM_DIV_FRAC_MASK;
+
+ high = bcm2835_clock_rate_from_divisor(clock, *prate,
+ int_div);
+ int_div += CM_DIV_FRAC_MASK + 1;
+ low = bcm2835_clock_rate_from_divisor(clock, *prate,
+ int_div);
+
+ /*
+ * Return a value which is the maximum deviation
+ * below the ideal rate, for use as a metric.
+ */
+ return *avgrate - max(*avgrate - low, high - *avgrate);
+ }
+ return *avgrate;
}
if (data->frac_bits)
@@ -1167,6 +1186,7 @@ static unsigned long bcm2835_clock_choose_div_and_prate(struct clk_hw *hw,
*div = curdiv << CM_DIV_FRAC_BITS;
*prate = curdiv * best_rate;
+ *avgrate = best_rate;
return best_rate;
}
@@ -1178,6 +1198,7 @@ static int bcm2835_clock_determine_rate(struct clk_hw *hw,
bool current_parent_is_pllc;
unsigned long rate, best_rate = 0;
unsigned long prate, best_prate = 0;
+ unsigned long avgrate, best_avgrate = 0;
size_t i;
u32 div;
@@ -1202,11 +1223,13 @@ static int bcm2835_clock_determine_rate(struct clk_hw *hw,
continue;
rate = bcm2835_clock_choose_div_and_prate(hw, i, req->rate,
- &div, &prate);
+ &div, &prate,
+ &avgrate);
if (rate > best_rate && rate <= req->rate) {
best_parent = parent;
best_prate = prate;
best_rate = rate;
+ best_avgrate = avgrate;
}
}
@@ -1216,7 +1239,7 @@ static int bcm2835_clock_determine_rate(struct clk_hw *hw,
req->best_parent_hw = best_parent;
req->best_parent_rate = best_prate;
- req->rate = best_rate;
+ req->rate = best_avgrate;
return 0;
}
@@ -2025,6 +2048,7 @@ struct bcm2835_clk_desc {
.int_bits = 12,
.frac_bits = 12,
.is_mash_clock = true,
+ .low_jitter = true,
.tcnt_mux = 23),
[BCM2835_CLOCK_PWM] = REGISTER_PER_CLK(
.name = "pwm",

70
bcm2835-fix-potential-null-pointer-dereferences.patch Normal file
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@ -0,0 +1,70 @@
From patchwork Thu May 25 17:04:55 2017
Content-Type: text/plain; charset="utf-8"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Subject: [v2] mmc: bcm2835: fix potential null pointer dereferences
From: "Gustavo A. R. Silva" <garsilva@embeddedor.com>
X-Patchwork-Id: 9748761
Message-Id: <20170525170455.GA6904@embeddedgus>
To: Stefan Wahren <stefan.wahren@i2se.com>,
Ulf Hansson <ulf.hansson@linaro.org>,
Florian Fainelli <f.fainelli@gmail.com>,
Ray Jui <rjui@broadcom.com>, Scott Branden <sbranden@broadcom.com>,
bcm-kernel-feedback-list@broadcom.com, Eric Anholt <eric@anholt.net>
Cc: "Gustavo A. R. Silva" <garsilva@embeddedor.com>,
linux-mmc@vger.kernel.org, linux-rpi-kernel@lists.infradead.org,
linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org
Date: Thu, 25 May 2017 12:04:55 -0500
Null check at line 1165: if (mrq->cmd), implies that mrq->cmd might
be NULL.
Add null checks before dereferencing pointer mrq->cmd in order to avoid
any potential NULL pointer dereference.
Addresses-Coverity-ID: 1408740
Tested-by: Stefan Wahren <stefan.wahren@i2se.com>
Signed-off-by: Gustavo A. R. Silva <garsilva@embeddedor.com>
---
Changes in v2:
Change subject to make it clear the patch is bcm2835 related.
drivers/mmc/host/bcm2835.c | 12 +++++++++---
1 file changed, 9 insertions(+), 3 deletions(-)
diff --git a/drivers/mmc/host/bcm2835.c b/drivers/mmc/host/bcm2835.c
index 1f343a4..abba9a2 100644
--- a/drivers/mmc/host/bcm2835.c
+++ b/drivers/mmc/host/bcm2835.c
@@ -1172,7 +1172,10 @@ static void bcm2835_request(struct mmc_host *mmc, struct mmc_request *mrq)
if (mrq->data && !is_power_of_2(mrq->data->blksz)) {
dev_err(dev, "unsupported block size (%d bytes)\n",
mrq->data->blksz);
- mrq->cmd->error = -EINVAL;
+
+ if (mrq->cmd)
+ mrq->cmd->error = -EINVAL;
+
mmc_request_done(mmc, mrq);
return;
}
@@ -1194,7 +1197,10 @@ static void bcm2835_request(struct mmc_host *mmc, struct mmc_request *mrq)
readl(host->ioaddr + SDCMD) & SDCMD_CMD_MASK,
edm);
bcm2835_dumpregs(host);
- mrq->cmd->error = -EILSEQ;
+
+ if (mrq->cmd)
+ mrq->cmd->error = -EILSEQ;
+
bcm2835_finish_request(host);
mutex_unlock(&host->mutex);
return;
@@ -1207,7 +1213,7 @@ static void bcm2835_request(struct mmc_host *mmc, struct mmc_request *mrq)
if (!host->use_busy)
bcm2835_finish_command(host);
}
- } else if (bcm2835_send_command(host, mrq->cmd)) {
+ } else if (mrq->cmd && bcm2835_send_command(host, mrq->cmd)) {
if (host->data && host->dma_desc) {
/* DMA transfer starts now, PIO starts after irq */
bcm2835_start_dma(host);

6
kernel.spec
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@ -604,6 +604,9 @@ Patch311: arm-imx6-hummingboard2.patch
Patch312: arm64-Add-option-of-13-for-FORCE_MAX_ZONEORDER.patch
Patch313: bcm2835-clk-audio-jitter-issues.patch
Patch314: bcm2835-fix-potential-null-pointer-dereferences.patch
# 400 - IBM (ppc/s390x) patches
# 500 - Temp fixes/CVEs etc
@ -2164,6 +2167,9 @@ fi
#
#
%changelog
* Wed Jun 7 2017 Peter Robinson <pbrobinson@fedoraproject.org>
- A couple of upstream fixes for Raspberry Pi
* Tue Jun 06 2017 Laura Abbott <labbott@redhat.com>
- Enable the vDSO for arm LPAE