linux-kernel - [PATCH v3 2/2] mmc: tegra: fix reporting of base clock frequency

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Date:	Thu, 22 May 2014 08:55:36 -0700
From:	Andrew Bresticker <abrestic@...omium.org>
To:	Chris Ball <chris@...ntf.net>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	Stephen Warren <swarren@...dotorg.org>,
	Thierry Reding <thierry.reding@...il.com>
Cc:	linux-mmc@...r.kernel.org, linux-tegra@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Andrew Bresticker <abrestic@...omium.org>
Subject: [PATCH v3 2/2] mmc: tegra: fix reporting of base clock frequency

Tegra SDHCI controllers, by default, report a base clock frequency
of 208Mhz in SDHCI_CAPABILTIES which may or may not be equal to the
actual base clock frequency.  This is because the clock rate is
configured by the clock controller, which is external to the SD/MMC
controller.  Since the SD/MMC controller has no knowledge of how this
clock is configured, it will simply report the maximum frequency.
While the reported value can be overridden by setting BASE_CLK_FREQ in
VENDOR_CLOCK_CTRL on Tegra30 and later SoCs, just set CAP_CLOCK_BASE_BROKEN
and supply sdhci_pltfm_clk_get_max_clock(), which simply does a
clk_get_rate(), as the get_max_clock() callback.

Signed-off-by: Andrew Bresticker <abrestic@...omium.org>
Tested-by: Stephen Warren <swarren@...dia.com>
Acked-by: Stephen Warren <swarren@...dia.com>
---
Changes from v2:
 - rebased on mmc-next
Changes from v1:
 - fixed up commit message per Stephen's suggestions
---
 drivers/mmc/host/sdhci-tegra.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/mmc/host/sdhci-tegra.c b/drivers/mmc/host/sdhci-tegra.c
index 4375cd4..d93a063 100644
--- a/drivers/mmc/host/sdhci-tegra.c
+++ b/drivers/mmc/host/sdhci-tegra.c
@@ -154,13 +154,15 @@ static const struct sdhci_ops tegra_sdhci_ops = {
 	.set_bus_width = tegra_sdhci_set_bus_width,
 	.reset      = tegra_sdhci_reset,
 	.set_uhs_signaling = sdhci_set_uhs_signaling,
+	.get_max_clock = sdhci_pltfm_clk_get_max_clock,
 };
 
 static const struct sdhci_pltfm_data sdhci_tegra20_pdata = {
 	.quirks = SDHCI_QUIRK_BROKEN_TIMEOUT_VAL |
 		  SDHCI_QUIRK_SINGLE_POWER_WRITE |
 		  SDHCI_QUIRK_NO_HISPD_BIT |
-		  SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC,
+		  SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC |
+		  SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN,
 	.ops  = &tegra_sdhci_ops,
 };
 
@@ -175,7 +177,8 @@ static const struct sdhci_pltfm_data sdhci_tegra30_pdata = {
 		  SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK |
 		  SDHCI_QUIRK_SINGLE_POWER_WRITE |
 		  SDHCI_QUIRK_NO_HISPD_BIT |
-		  SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC,
+		  SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC |
+		  SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN,
 	.ops  = &tegra_sdhci_ops,
 };
 
@@ -191,7 +194,8 @@ static const struct sdhci_pltfm_data sdhci_tegra114_pdata = {
 		  SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK |
 		  SDHCI_QUIRK_SINGLE_POWER_WRITE |
 		  SDHCI_QUIRK_NO_HISPD_BIT |
-		  SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC,
+		  SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC |
+		  SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN,
 	.ops  = &tegra_sdhci_ops,
 };
 
-- 
1.9.1.423.g4596e3a

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