leandrof/linux
1
0
Fork 0
forked from Minki/linux
Code Issues Pull Requests Packages Projects Releases Wiki Activity

mmc: sdhci-pci-gli: GL9755: Support for CD/WP inversion on OF platforms

Browse Source 
This is required on some Apple ARM64 laptops using this controller.
As is typical on DT platforms, pull these quirks from the device tree
using the standard mmc bindings.

See Documentation/devicetree/bindings/mmc/mmc-controller.yaml

Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Hector Martin <marcan@marcan.st>
Link: https://lore.kernel.org/r/20211215161045.38843-2-marcan@marcan.st
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Hector Martin 2021-12-16 01:10:44 +09:00 committed by Ulf Hansson
parent 1ccaa1bdcc
commit 189f1d9bc3
1 changed files with 11 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
drivers/mmc/host/sdhci-pci-gli.c
View File

@ -12,6 +12,7 @@
#include <linux/pci.h>
#include <linux/mmc/mmc.h>
#include <linux/delay.h>
#include <linux/of.h>
#include "sdhci.h"
#include "sdhci-pci.h"
#include "cqhci.h"
@ -116,6 +117,8 @@
#define PCI_GLI_9755_PECONF 0x44
#define PCI_GLI_9755_LFCLK GENMASK(14, 12)
#define PCI_GLI_9755_DMACLK BIT(29)
#define PCI_GLI_9755_INVERT_CD BIT(30)
#define PCI_GLI_9755_INVERT_WP BIT(31)
#define PCI_GLI_9755_CFG2 0x48
#define PCI_GLI_9755_CFG2_L1DLY GENMASK(28, 24)
@ -570,6 +573,14 @@ static void gl9755_hw_setting(struct sdhci_pci_slot *slot)
gl9755_wt_on(pdev);
pci_read_config_dword(pdev, PCI_GLI_9755_PECONF, &value);
/*
* Apple ARM64 platforms using these chips may have
* inverted CD/WP detection.
*/
if (of_property_read_bool(pdev->dev.of_node, "cd-inverted"))
value |= PCI_GLI_9755_INVERT_CD;
if (of_property_read_bool(pdev->dev.of_node, "wp-inverted"))
value |= PCI_GLI_9755_INVERT_WP;
value &= ~PCI_GLI_9755_LFCLK;
value &= ~PCI_GLI_9755_DMACLK;
pci_write_config_dword(pdev, PCI_GLI_9755_PECONF, value);